diff --git a/Cupcake.podspec b/Cupcake.podspec
index 6cf5467..38cea5b 100644
--- a/Cupcake.podspec
+++ b/Cupcake.podspec
@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
 
   s.name         = "Cupcake"
-  s.version      = "1.1.1"
+  s.version      = "1.2.0"
   s.summary      = "An easy way to create and layout UI components for iOS."
 
   s.description  = <<-DESC
diff --git a/Cupcake/AttStr.swift b/Cupcake/AttStr.swift
index 35d4198..43192dd 100644
--- a/Cupcake/AttStr.swift
+++ b/Cupcake/AttStr.swift
@@ -56,7 +56,7 @@ public extension NSMutableAttributedString {
         ...
      */
     @discardableResult public func font(_ style: Any) -> Self {
-        cpk_addAttribute(name: NSFontAttributeName, value: Font(style))
+        cpk_addAttribute(name: "NSFont", value: Font(style))
         return self
     }
     
@@ -72,7 +72,7 @@ public extension NSMutableAttributedString {
         ...
      */
     @discardableResult public func color(_ any: Any) -> Self {
-        cpk_addAttribute(name: NSForegroundColorAttributeName, value: Color(any)!)
+        cpk_addAttribute(name: "NSColor", value: Color(any)!)
         return self
     }
     
@@ -89,7 +89,7 @@ public extension NSMutableAttributedString {
         ...
      */
     @discardableResult public func bg(_ any: Any) -> Self {
-        cpk_addAttribute(name: NSBackgroundColorAttributeName, value: Color(any) ?? Color(Img(any))!)
+        cpk_addAttribute(name: "NSBackgroundColor", value: Color(any) ?? Color(Img(any))!)
         return self
     }
     
@@ -110,9 +110,9 @@ public extension NSMutableAttributedString {
             styles = NSNumber(value: style.rawValue | NSUnderlineStyle.styleSingle.rawValue)
         }
         
-        cpk_addAttribute(name: NSUnderlineStyleAttributeName, value: styles)
+        cpk_addAttribute(name: "NSUnderline", value: styles)
         if let underlineColor = Color(color) {
-            cpk_addAttribute(name: NSUnderlineColorAttributeName, value: underlineColor)
+            cpk_addAttribute(name: "NSUnderlineColor", value: underlineColor)
         }
         return self
     }
@@ -138,9 +138,9 @@ public extension NSMutableAttributedString {
             styles = NSNumber(value: style.rawValue | NSUnderlineStyle.styleSingle.rawValue)
         }
         
-        cpk_addAttribute(name: NSStrikethroughStyleAttributeName, value: styles)
+        cpk_addAttribute(name: "NSStrikethrough", value: styles)
         if let strikethroughColor = Color(color) {
-            cpk_addAttribute(name: NSStrikethroughColorAttributeName, value: strikethroughColor)
+            cpk_addAttribute(name: "NSStrikethroughColor", value: strikethroughColor)
         }
         return self
     }
@@ -158,9 +158,9 @@ public extension NSMutableAttributedString {
         .stroke(-4, "red")
      */
     @discardableResult public func stroke(_ width: CGFloat, _ color: Any? = nil) -> Self {
-        cpk_addAttribute(name: NSStrokeWidthAttributeName, value: width)
+        cpk_addAttribute(name: "NSStrokeWidth", value: width)
         if let strokeColor = Color(color) {
-            cpk_addAttribute(name: NSStrokeColorAttributeName, value: strokeColor)
+            cpk_addAttribute(name: "NSStrokeColor", value: strokeColor)
         }
         return self
     }
@@ -172,7 +172,7 @@ public extension NSMutableAttributedString {
         .oblique(-0.3)
      */
     @discardableResult public func oblique(_ value: CGFloat) -> Self {
-        cpk_addAttribute(name: NSObliquenessAttributeName, value: value)
+        cpk_addAttribute(name: "NSObliqueness", value: value)
         return self
     }
     
@@ -183,7 +183,7 @@ public extension NSMutableAttributedString {
         .offset(-20)
      */
     @discardableResult public func offset(_ offset: CGFloat) -> Self {
-        cpk_addAttribute(name: NSBaselineOffsetAttributeName, value: offset)
+        cpk_addAttribute(name: "NSBaselineOffset", value: offset)
         return self
     }
     
@@ -196,7 +196,7 @@ public extension NSMutableAttributedString {
      */
     @discardableResult public func link(_ url: String? = nil) -> Self {
         if let urlString = url {
-            cpk_addAttribute(name: NSLinkAttributeName, value: urlString)
+            cpk_addAttribute(name: "NSLink", value: urlString)
         } else {
             cpk_addAttribute(name: CPKLabelLinkAttributeName, value: CPKLabelLinkAttributeValue)
         }
diff --git a/Cupcake/Button.swift b/Cupcake/Button.swift
index 2fe5ed3..d24faad 100644
--- a/Cupcake/Button.swift
+++ b/Cupcake/Button.swift
@@ -26,7 +26,7 @@ public extension UIButton {
         .str( AttStr("hello world").strikethrough() )
         ...
      */
-    @discardableResult public func str(_ any: Any) -> Self {
+    @objc @discardableResult public func str(_ any: Any) -> Self {
         if let attStr = any as? NSAttributedString {
             setAttributedTitle(attStr, for: .normal)
         } else {
@@ -47,7 +47,7 @@ public extension UIButton {
         .font(someLabel.font)
         ...
      **/
-    @discardableResult public func font(_ any: Any) -> Self {
+    @objc @discardableResult public func font(_ any: Any) -> Self {
         self.titleLabel?.font = Font(any)
         return self
     }
@@ -63,7 +63,7 @@ public extension UIButton {
         .color(someLabel.textColor)
         ...
      */
-    @discardableResult public func color(_ any: Any) -> Self {
+    @objc @discardableResult public func color(_ any: Any) -> Self {
         setTitleColor(Color(any), for: .normal)
         return self
     }
@@ -79,7 +79,7 @@ public extension UIButton {
         .highColor(someLabel.textColor)
         ...
      */
-    @discardableResult public func highColor(_ any: Any) -> Self {
+    @objc @discardableResult public func highColor(_ any: Any) -> Self {
         setTitleColor(Color(any), for: .highlighted)
         return self
     }
@@ -95,7 +95,7 @@ public extension UIButton {
         .img(someImage)
         ...
      */
-    @discardableResult public func img(_ any: Any) -> Self {
+    @objc @discardableResult public func img(_ any: Any) -> Self {
         let image = Img(any)
         setImage(image, for: .normal)
         if self.frame.isEmpty {
@@ -115,7 +115,7 @@ public extension UIButton {
         .highImg(someImage)
         ...
      */
-    @discardableResult public func highImg(_ any: Any) -> Self {
+    @objc @discardableResult public func highImg(_ any: Any) -> Self {
         setImage(Img(any), for: .highlighted)
         return self
     }
@@ -133,7 +133,7 @@ public extension UIButton {
         .bg(someImage)  //using image
         ...
      */
-    @discardableResult override public func bg(_ any: Any) -> Self {
+    @objc @discardableResult override public func bg(_ any: Any) -> Self {
         let image = Img(any)
         setBackgroundImage(image, for: .normal)
         cpk_masksToBoundsIfNeed()
@@ -157,7 +157,7 @@ public extension UIButton {
         .highBg(someImage)  //using image
         ...
      */
-    @discardableResult public func highBg(_ any: Any) -> Self {
+    @objc @discardableResult public func highBg(_ any: Any) -> Self {
         setBackgroundImage(Img(any), for: .highlighted)
         cpk_masksToBoundsIfNeed()
         return self
@@ -181,7 +181,7 @@ public extension UIButton {
      * Usages:
         .gap(10)
      */
-    @discardableResult public func gap(_ spacing: CGFloat) -> Self {
+    @objc @discardableResult public func gap(_ spacing: CGFloat) -> Self {
         self.cpkGap = spacing
         let halfGap = spacing / 2
         
@@ -202,7 +202,7 @@ public extension UIButton {
         .reversed()
         .reversed(false)
      */
-    @discardableResult public func reversed(_ reversed: Bool = true) -> Self {
+    @objc @discardableResult public func reversed(_ reversed: Bool = true) -> Self {
         let t = reversed ? CATransform3DMakeScale(-1, 1, 1) : CATransform3DIdentity
         self.layer.sublayerTransform = t
         self.imageView?.layer.transform = t
@@ -217,7 +217,7 @@ public extension UIButton {
         .lines(0)   //multilines
         .lines()    //same as .lines(0)
      */
-    @discardableResult public func lines(_ numberOfLines: CGFloat = 0) -> Self {
+    @objc @discardableResult public func lines(_ numberOfLines: CGFloat = 0) -> Self {
         self.titleLabel?.numberOfLines = Int(numberOfLines)
         self.titleLabel?.lineBreakMode = .byWordWrapping
         self.titleLabel?.textAlignment = .center
diff --git a/Cupcake/ImageView.swift b/Cupcake/ImageView.swift
index 0e17ea4..d614262 100644
--- a/Cupcake/ImageView.swift
+++ b/Cupcake/ImageView.swift
@@ -28,7 +28,7 @@ public extension UIImageView {
         .img(someImage)
         ...
     */
-    @discardableResult public func img(_ any: Any) -> Self {
+    @objc @discardableResult public func img(_ any: Any) -> Self {
         self.image = Img(any)
         
         if self.image != nil {
@@ -48,7 +48,7 @@ public extension UIImageView {
         .mode(.center)
         ...
     */
-    @discardableResult public func mode(_ contentMode: UIViewContentMode) -> Self {
+    @objc @discardableResult public func mode(_ contentMode: UIViewContentMode) -> Self {
         self.contentMode = contentMode
         return self
     }
diff --git a/Cupcake/Label.swift b/Cupcake/Label.swift
index f954fd0..d34a2a3 100644
--- a/Cupcake/Label.swift
+++ b/Cupcake/Label.swift
@@ -25,7 +25,7 @@ public extension UILabel {
         .str( AttStr("hello world").strikethrough() )
         ...
      */
-    @discardableResult public func str(_ any: Any) -> Self {
+    @objc @discardableResult public func str(_ any: Any) -> Self {
         if let attStr = any as? NSAttributedString {
             self.attributedText = attStr
         } else {
@@ -46,7 +46,7 @@ public extension UILabel {
         .font(someLabel.font)
         ...
      **/
-    @discardableResult public func font(_ any: Any) -> Self {
+    @objc @discardableResult public func font(_ any: Any) -> Self {
         self.font = Font(any)
         return self
     }
@@ -62,7 +62,7 @@ public extension UILabel {
         .color(someLabel.textColor)
         ...
      */
-    @discardableResult public func color(_ any: Any) -> Self {
+    @objc @discardableResult public func color(_ any: Any) -> Self {
         self.textColor = Color(any)
         return self
     }
@@ -74,7 +74,7 @@ public extension UILabel {
         .lines(0)   //multilines
         .lines()    //same as .lines(0)
      */
-    @discardableResult public func lines(_ numberOfLines: CGFloat = 0) -> Self {
+    @objc @discardableResult public func lines(_ numberOfLines: CGFloat = 0) -> Self {
         self.numberOfLines = Int(numberOfLines)
         return self
     }
@@ -84,7 +84,7 @@ public extension UILabel {
      * Usages:
         .lineGap(8)
      */
-    @discardableResult public func lineGap(_ lineSpacing: CGFloat) -> Self {
+    @objc @discardableResult public func lineGap(_ lineSpacing: CGFloat) -> Self {
         self.cpkLineGap = lineSpacing
         return self
     }
@@ -96,7 +96,7 @@ public extension UILabel {
         .align(.justified)
         ...
      */
-    @discardableResult public func align(_ textAlignment: NSTextAlignment) -> Self {
+    @objc @discardableResult public func align(_ textAlignment: NSTextAlignment) -> Self {
         self.textAlignment = textAlignment
         return self
     }
diff --git a/Cupcake/Str.swift b/Cupcake/Str.swift
index faffe13..d79bec6 100644
--- a/Cupcake/Str.swift
+++ b/Cupcake/Str.swift
@@ -35,11 +35,12 @@ public extension String {
     @discardableResult public func subFrom(_ indexOrSubstring: Any) -> String {
         if var index = indexOrSubstring as? Int {
             if index < 0 { index += self.characters.count }
-            return self.substring(from: self.index(self.startIndex, offsetBy: index))
+            let from = self.index(self.startIndex, offsetBy: index)
+            return self.cpk_substring(from: from)
             
         } else if let substr = indexOrSubstring as? String {
             if let range = self.range(of: substr) {
-                return self.substring(from: range.lowerBound)
+                return self.cpk_substring(from: range.lowerBound)
             }
         }
         
@@ -57,11 +58,12 @@ public extension String {
     @discardableResult public func subTo(_ indexOrSubstring: Any) -> String {
         if var index = indexOrSubstring as? Int {
             if index < 0 { index += self.characters.count }
-            return self.substring(to: self.index(self.startIndex, offsetBy: index))
+            let to = self.index(self.startIndex, offsetBy: index)
+            return self.cpk_substring(to: to)
             
         } else if let substr = indexOrSubstring as? String {
             if let range = self.range(of: substr) {
-                return self.substring(to: range.lowerBound)
+                return self.cpk_substring(to: range.lowerBound)
             }
         }
         
@@ -80,32 +82,32 @@ public extension String {
             return String(self[self.index(self.startIndex, offsetBy: index)])
             
         } else if let range = indexOrRange as? Range<String.Index> {
-            return self.substring(with: range)
+            return self.cpk_substring(with: range)
             
         } else if let range = indexOrRange as? Range<Int> {
             let lower = self.index(self.startIndex, offsetBy: range.lowerBound)
             let upper = self.index(self.startIndex, offsetBy: range.upperBound)
-            return self.substring(with: lower..<upper)
+            return self.cpk_substring(with: lower..<upper)
             
         } else if let range = indexOrRange as? CountableRange<Int> {
             let lower = self.index(self.startIndex, offsetBy: range.lowerBound)
             let upper = self.index(self.startIndex, offsetBy: range.upperBound)
-            return self.substring(with: lower..<upper)
+            return self.cpk_substring(with: lower..<upper)
             
         } else if let range = indexOrRange as? ClosedRange<Int> {
             let lower = self.index(self.startIndex, offsetBy: range.lowerBound)
             let upper = self.index(self.startIndex, offsetBy: range.upperBound + 1)
-            return self.substring(with: lower..<upper)
+            return self.cpk_substring(with: lower..<upper)
             
         } else if let range = indexOrRange as? CountableClosedRange<Int> {
             let lower = self.index(self.startIndex, offsetBy: range.lowerBound)
             let upper = self.index(self.startIndex, offsetBy: range.upperBound + 1)
-            return self.substring(with: lower..<upper)
+            return self.cpk_substring(with: lower..<upper)
         
         } else if let range = indexOrRange as? NSRange {
             let lower = self.index(self.startIndex, offsetBy: range.location)
             let upper = self.index(self.startIndex, offsetBy: range.location + range.length)
-            return self.substring(with: lower..<upper)
+            return self.cpk_substring(with: lower..<upper)
         }
         
         return ""
diff --git a/Cupcake/TextField.swift b/Cupcake/TextField.swift
index 776d0b8..54c44ec 100644
--- a/Cupcake/TextField.swift
+++ b/Cupcake/TextField.swift
@@ -27,7 +27,7 @@ public extension UITextField {
         .str( AttStr("hello world").strikethrough() )
         ...
      */
-    @discardableResult public func str(_ any: Any) -> Self {
+    @objc @discardableResult public func str(_ any: Any) -> Self {
         if let attStr = any as? NSAttributedString {
             self.attributedText = attStr
         } else {
@@ -44,7 +44,7 @@ public extension UITextField {
         .hint("Enter your name")
         .hint( AttStr("Enter your name").font(13) )
      */
-    @discardableResult public func hint(_ any: Any) -> Self {
+    @objc @discardableResult public func hint(_ any: Any) -> Self {
         if let attStr = any as? NSAttributedString {
             self.attributedPlaceholder = attStr
         } else {
@@ -64,7 +64,7 @@ public extension UITextField {
         .font(someLabel.font)
         ...
      **/
-    @discardableResult public func font(_ any: Any) -> Self {
+    @objc @discardableResult public func font(_ any: Any) -> Self {
         self.font = Font(any)
         return self
     }
@@ -80,7 +80,7 @@ public extension UITextField {
         .color(someLabel.textColor)
         ...
      */
-    @discardableResult public func color(_ any: Any) -> Self {
+    @objc @discardableResult public func color(_ any: Any) -> Self {
         self.textColor = Color(any)
         return self
     }
@@ -90,7 +90,7 @@ public extension UITextField {
      * Usages:
         .maxLength(10)
      */
-    @discardableResult public func maxLength(_ length: CGFloat) -> Self {
+    @objc @discardableResult public func maxLength(_ length: CGFloat) -> Self {
         self.cpkMaxLength = Int(length)
         return self
     }
@@ -114,7 +114,7 @@ public extension UITextField {
         .secure()           //secureTextEntry = true
         .secure(false)      //secureTextEntry = false
      */
-    @discardableResult public func secure(_ secureTextEntry: Bool = true) -> Self {
+    @objc @discardableResult public func secure(_ secureTextEntry: Bool = true) -> Self {
         self.isSecureTextEntry = secureTextEntry
         return self
     }
@@ -126,7 +126,7 @@ public extension UITextField {
         .align(.justified)
         ...
      */
-    @discardableResult public func align(_ textAlignment: NSTextAlignment) -> Self {
+    @objc @discardableResult public func align(_ textAlignment: NSTextAlignment) -> Self {
         self.textAlignment = textAlignment
         return self
     }
@@ -138,7 +138,7 @@ public extension UITextField {
         .keyboard(.emailAddress)
         ...
      */
-    @discardableResult public func keyboard(_ keyboardType: UIKeyboardType) -> Self {
+    @objc @discardableResult public func keyboard(_ keyboardType: UIKeyboardType) -> Self {
         self.keyboardType = keyboardType
         return self
     }
@@ -150,7 +150,7 @@ public extension UITextField {
         .returnKey(.google)
         ...
      */
-    @discardableResult public func returnKey(_ returnKeyType: UIReturnKeyType) -> Self {
+    @objc @discardableResult public func returnKey(_ returnKeyType: UIReturnKeyType) -> Self {
         self.returnKeyType = returnKeyType
         return self
     }
@@ -162,7 +162,7 @@ public extension UITextField {
         .clearMode(.always)
         ...
      */
-    @discardableResult public func clearMode(_ clearButtonMode: UITextFieldViewMode) -> Self {
+    @objc @discardableResult public func clearMode(_ clearButtonMode: UITextFieldViewMode) -> Self {
         self.clearButtonMode = clearButtonMode
         return self
     }
diff --git a/Cupcake/TextView.swift b/Cupcake/TextView.swift
index c1ba659..a069aec 100644
--- a/Cupcake/TextView.swift
+++ b/Cupcake/TextView.swift
@@ -24,7 +24,7 @@ public extension UITextView {
         .str( AttStr("hello world").strikethrough() )
         ...
      */
-    @discardableResult public func str(_ any: Any) -> Self {
+    @objc @discardableResult public func str(_ any: Any) -> Self {
         if let attStr = any as? NSAttributedString {
             self.attributedText = attStr
         } else {
@@ -41,7 +41,7 @@ public extension UITextView {
         .hint("Enter here")
         .hint( AttStr("Enter here").font(13) )
      */
-    @discardableResult public func hint(_ any: Any) -> Self {
+    @objc @discardableResult public func hint(_ any: Any) -> Self {
         cpk_setPlaceholder(any)
         return self
     }
@@ -57,7 +57,7 @@ public extension UITextView {
         .font(someLabel.font)
         ...
      **/
-    @discardableResult public func font(_ any: Any) -> Self {
+    @objc @discardableResult public func font(_ any: Any) -> Self {
         self.font = Font(any)
         return self
     }
@@ -73,7 +73,7 @@ public extension UITextView {
         .color(someLabel.textColor)
         ...
      */
-    @discardableResult public func color(_ any: Any) -> Self {
+    @objc @discardableResult public func color(_ any: Any) -> Self {
         self.textColor = Color(any)
         return self
     }
@@ -83,7 +83,7 @@ public extension UITextView {
      * Usages:
         .maxLength(10)
      */
-    @discardableResult public func maxLength(_ length: CGFloat) -> Self {
+    @objc @discardableResult public func maxLength(_ length: CGFloat) -> Self {
         self.cpkMaxLength = Int(length)
         return self
     }
@@ -108,7 +108,7 @@ public extension UITextView {
         .align(.justified)
         ...
      */
-    @discardableResult public func align(_ textAlignment: NSTextAlignment) -> Self {
+    @objc @discardableResult public func align(_ textAlignment: NSTextAlignment) -> Self {
         self.textAlignment = textAlignment
         return self
     }
diff --git a/Cupcake/View.swift b/Cupcake/View.swift
index b640bc7..a81466b 100644
--- a/Cupcake/View.swift
+++ b/Cupcake/View.swift
@@ -28,7 +28,7 @@ public extension UIView {
         .bg("cat")      //using image
         ...
      */
-    @discardableResult public func bg(_ any: Any) -> Self {
+    @objc @discardableResult public func bg(_ any: Any) -> Self {
         self.backgroundColor = Color(any) ?? Color(Img(any))
         return self
     }
@@ -41,7 +41,7 @@ public extension UIView {
         .tint("red")
         .tint("#00F")
      */
-    @discardableResult public func tint(_ any: Any) -> Self {
+    @objc @discardableResult public func tint(_ any: Any) -> Self {
         self.tintColor = Color(any)
         return self
     }
@@ -54,7 +54,7 @@ public extension UIView {
         .radius(10)
         .radius(-1)   //passing negative number means using auto rounding
      */
-    @discardableResult public func radius(_ cornerRadius: CGFloat) -> Self {
+    @objc @discardableResult public func radius(_ cornerRadius: CGFloat) -> Self {
         if cornerRadius < 0 {
             self.layer.cornerRadius = self.bounds.height / 2
             self.cpkAutoRoundingRadius = true
@@ -75,7 +75,7 @@ public extension UIView {
         .border(1)
         .border(1, "red")
      */
-    @discardableResult public func border(_ borderWidth: CGFloat, _ borderColor: Any? = nil) -> Self {
+    @objc @discardableResult public func border(_ borderWidth: CGFloat, _ borderColor: Any? = nil) -> Self {
         self.layer.borderWidth = borderWidth
         self.layer.borderColor = Color(borderColor)?.cgColor
         return self
@@ -88,10 +88,10 @@ public extension UIView {
         .shadow(0.7, 2)
         .shadow(0.7, 3, 0, 0)
      */
-    @discardableResult public func shadow(_ shadowOpacity: CGFloat,
-                                          _ shadowRadius: CGFloat = 3,
-                                          _ shadowOffsetX: CGFloat = 0,
-                                          _ shadowOffsetY: CGFloat = 3) -> Self {
+    @objc @discardableResult public func shadow(_ shadowOpacity: CGFloat,
+                                                _ shadowRadius: CGFloat = 3,
+                                                _ shadowOffsetX: CGFloat = 0,
+                                                _ shadowOffsetY: CGFloat = 3) -> Self {
         
         self.layer.shadowOpacity = Float(shadowOpacity)
         self.layer.shadowRadius = shadowRadius
@@ -108,7 +108,7 @@ public extension UIView {
         .styles(myStyle1, myStyle2, "globalStyle1")
         .styles(someView)       //retrieve styles direct from view
      */
-    @discardableResult public func styles(_ s1: Any, _ s2: Any? = nil, _ s3: Any? = nil, _ s4: Any? = nil) -> Self {
+    @objc @discardableResult public func styles(_ s1: Any, _ s2: Any? = nil, _ s3: Any? = nil, _ s4: Any? = nil) -> Self {
         var array = Array<Any>()
         array.append(s1)
         
@@ -142,7 +142,7 @@ public extension UIView {
         .touchInsets(10, 20, 30)            //top: 10, left: 20, bottom: 0 , right: 30
         .touchInsets(10, 20, 30, 40)        //top: 10, left: 20, bottom: 30, right: 40
      */
-    @discardableResult public func touchInsets(_ p1: Any, _ p2: Any? = nil, _ p3: Any? = nil, _ p4: Any? = nil) -> Self {
+    @objc @discardableResult public func touchInsets(_ p1: Any, _ p2: Any? = nil, _ p3: Any? = nil, _ p4: Any? = nil) -> Self {
         self.cpkTouchInsets = cpk_edgeInsetsFromParameters(p1, p2, p3, p4)
         return self
     }
@@ -156,7 +156,7 @@ public extension UIView {
         .onClick({ _ in /* ... */ })                //if you don't care at all
         .onClick({ [weak self] _ in /* ... */ })    //capture self as weak reference when needed
     */
-    @discardableResult public func onClick(_ closure: @escaping (UIView)->()) -> Self {
+    @objc @discardableResult public func onClick(_ closure: @escaping (UIView)->()) -> Self {
         cpk_onClick(closure, nil)
         return self
     }
@@ -166,7 +166,7 @@ public extension UIView {
      * Usages:
         .addTo(superView)
      */
-    @discardableResult public func addTo(_ superview: UIView) -> Self {
+    @objc @discardableResult public func addTo(_ superview: UIView) -> Self {
         superview.addSubview(self)
         return self
     }
@@ -206,7 +206,7 @@ public extension UIView {
         .margin(10, 20, 30)             //top: 10, left: 20, bottom: 0 , right: 30
         .margin(10, 20, 30, 40)         //top: 10, left: 20, bottom: 30, right: 40
      */
-    @discardableResult public func margin(_ p1: Any, _ p2: Any? = nil, _ p3: Any? = nil, _ p4: Any? = nil) -> Self {
+    @objc @discardableResult public func margin(_ p1: Any, _ p2: Any? = nil, _ p3: Any? = nil, _ p4: Any? = nil) -> Self {
         self.layoutMargins = cpk_edgeInsetsFromParameters(p1, p2, p3, p4)
         return self
     }
@@ -271,7 +271,7 @@ public extension UIView {
             _.size.equal(100, 100)
         })
      */
-    @discardableResult public func makeCons(_ closure: (ConsMaker)->()) -> Self {
+    @objc @discardableResult public func makeCons(_ closure: (ConsMaker)->()) -> Self {
         let maker = ConsMaker(firstItem: self)
         closure(maker)
         maker.updateConstraints()
@@ -287,7 +287,7 @@ public extension UIView {
             _.size.equal(anotherView)
         })
      */
-    @discardableResult public func remakeCons(_ closure: (ConsMaker)->()) -> Self {
+    @objc @discardableResult public func remakeCons(_ closure: (ConsMaker)->()) -> Self {
         let maker = ConsMaker(firstItem: self)
         closure(maker)
         maker.remakeConstraints()
@@ -310,9 +310,9 @@ public extension UIView {
      * Usages:
         .embedIn(superview, "10", 20, "30", 40) //topMargin: 10, left: 20, bottomMargin: 30, right: 40
      */
-    @discardableResult public func embedIn(_ superview: UIView,
-                                           _ p1: Any? = "", _ p2: Any? = "",
-                                           _ p3: Any? = "", _ p4: Any? = "") -> Self {
+    @objc @discardableResult public func embedIn(_ superview: UIView,
+                                                 _ p1: Any? = "", _ p2: Any? = "",
+                                                 _ p3: Any? = "", _ p4: Any? = "") -> Self {
         
         superview.addSubview(self)
         let edge = cpk_edgeInsetsTupleFromParameters(p1, p2, p3, p4)
diff --git a/Cupcake/__Private__Implementations__.swift b/Cupcake/__Private__Implementations__.swift
index 98db883..51e12c2 100644
--- a/Cupcake/__Private__Implementations__.swift
+++ b/Cupcake/__Private__Implementations__.swift
@@ -502,9 +502,6 @@ let CPKLabelLinkAttributeValue   = "CPKLabelLinkValue"
 
 fileprivate let CPKLinkColor = UIColor(red: 0, green: 0.478431, blue: 1, alpha: 1)
 
-fileprivate let CPKFixLineSpacingIssueAttributeName = "CPKFixLineSpacingIssue"
-fileprivate let CPKFixLineSpacingIssueAttributeValue = "Fix single line Label with lineSpacing issue"
-
 
 public extension NSObject {
     
@@ -525,27 +522,27 @@ public extension NSObject {
             return false
         }
         
-        var m1 = class_getInstanceMethod(self, s1)
-        var m2 = class_getInstanceMethod(self, s2)
+        var m1 = class_getInstanceMethod(self, s1!)
+        var m2 = class_getInstanceMethod(self, s2!)
         
         if m1 == nil || m2 == nil {
             return false
         }
         
-        class_addMethod(self, s1, method_getImplementation(m1), method_getTypeEncoding(m1))
-        class_addMethod(self, s2, method_getImplementation(m2), method_getTypeEncoding(m2))
+        class_addMethod(self, s1!, method_getImplementation(m1!), method_getTypeEncoding(m1!))
+        class_addMethod(self, s2!, method_getImplementation(m2!), method_getTypeEncoding(m2!))
         
-        m1 = class_getInstanceMethod(self, s1)
-        m2 = class_getInstanceMethod(self, s2)
-        method_exchangeImplementations(m1, m2)
+        m1 = class_getInstanceMethod(self, s1!)
+        m2 = class_getInstanceMethod(self, s2!)
+        method_exchangeImplementations(m1!, m2!)
         
         return true
     }
     
-    @discardableResult
-    public static func cpk_swizzleClass(method1: Any, method2: Any) -> Bool {
-        return object_getClass(self).cpk_swizzle(method1: method1, method2: method2)
-    }
+//    @discardableResult
+//    public static func cpk_swizzleClass(method1: Any, method2: Any) -> Bool {
+//        return object_getClass(self).cpk_swizzle(method1: method1, method2: method2)
+//    }
     
     @discardableResult
     public func cpk_safePerform(selector: Selector) -> Any? {
@@ -586,6 +583,34 @@ public extension NSObject {
 }
 
 
+
+extension String {
+    func cpk_substring(with range: Range<String.Index>) -> String {
+        #if swift(>=4.0)
+            return String(self[range])
+        #else
+            return self.substring(with: range)
+        #endif
+    }
+    
+    func cpk_substring(to index: String.Index) -> String {
+        #if swift(>=4.0)
+            return String(self[..<index])
+        #else
+            return self.substring(to: index)
+        #endif
+    }
+    
+    func cpk_substring(from index: String.Index) -> String {
+        #if swift(>=4.0)
+            return String(self[index...])
+        #else
+            return self.substring(from: index)
+        #endif
+    }
+}
+
+
 extension NSMutableAttributedString {
     
     private var cpkSelectedRanges: NSMutableIndexSet {
@@ -624,20 +649,28 @@ extension NSMutableAttributedString {
         }
     }
     
+    func cpk_addAttribute(_ name: String, value: Any, range: NSRange) {
+        #if swift(>=4.0)
+            addAttribute(NSAttributedStringKey(rawValue: name), value: value, range: range)
+        #else
+            addAttribute(name, value: value, range: range)
+        #endif
+    }
+    
     func cpk_addAttribute(name: String, value: Any) {
         self.cpkIsJustSelectingRange = false
         
         self.cpkSelectedRanges.enumerateRanges({ (range, stop) in
             
             if name == CPKLabelLinkAttributeName {
-                addAttribute(name, value: value, range: range)
-                addAttribute(NSForegroundColorAttributeName, value: CPKLinkColor, range: range)
+                cpk_addAttribute(name, value: value, range: range)
+                cpk_addAttribute("NSColor", value: CPKLinkColor, range: range)
                 
             } else {
                 if self.cpkPreventOverrideAttribute {
                     cpk_addAttributeIfNotExisted(name: name, value: value, range: range)
                 } else {
-                    addAttribute(name, value: value, range: range)
+                    cpk_addAttribute(name, value: value, range: range)
                 }
             }
         });
@@ -645,14 +678,29 @@ extension NSMutableAttributedString {
     
     func cpk_addAttributeIfNotExisted(name: String, value: Any, range: NSRange) {
         let indexSets = NSMutableIndexSet(indexesIn: range)
-        enumerateAttribute(name, in: range, options: NSAttributedString.EnumerationOptions(rawValue: 0)) { (value, range, stop) in
+        
+        #if swift(>=4.0)
+            enumerateAttribute(NSAttributedStringKey(rawValue: name),
+                               in: range,
+                               options: NSAttributedString.EnumerationOptions(rawValue: 0))
+            { (value, range, stop) in
             if value != nil {
                 indexSets.remove(in: range)
             }
         }
+        #else
+            enumerateAttribute(name,
+                               in: range,
+                               options: NSAttributedString.EnumerationOptions(rawValue: 0))
+            { (value, range, stop) in
+            if value != nil {
+                indexSets.remove(in: range)
+            }
+        }
+        #endif
         
         indexSets.enumerateRanges({ (range, stop) in
-            addAttribute(name, value: value, range: range)
+            cpk_addAttribute(name, value: value, range: range)
         })
     }
     
@@ -660,7 +708,7 @@ extension NSMutableAttributedString {
         let targetRange = range ?? NSMakeRange(0, self.length)
         var mutableStyle: NSMutableParagraphStyle
         
-        if let paraStyle = attribute(NSParagraphStyleAttributeName,
+        if let paraStyle = attribute("NSParagraphStyle",
                                      at: targetRange.location,
                                      longestEffectiveRange: nil,
                                      in: targetRange) as? NSParagraphStyle {
@@ -673,11 +721,7 @@ extension NSMutableAttributedString {
         }
         
         mutableStyle.setValue(value, forKey: key)
-        addAttribute(NSParagraphStyleAttributeName, value: mutableStyle, range: targetRange)
-        
-        if key == "lineSpacing" {
-            addAttribute(CPKFixLineSpacingIssueAttributeName, value: CPKFixLineSpacingIssueAttributeValue, range: targetRange)
-        }
+        cpk_addAttribute("NSParagraphStyle", value: mutableStyle, range: targetRange)
     }
 }
 
@@ -726,12 +770,12 @@ extension UIView {
         set { cpk_setAssociated(object: newValue, forKey: #function) }
     }
     
-    func cpk_setBounds(_ frame: CGRect) {
+    @objc func cpk_setBounds(_ frame: CGRect) {
         cpk_setBounds(frame)
         cpk_updateCornerRadiusIfNeed()
     }
     
-    func cpk_point(inside point: CGPoint, with event: UIEvent?) -> Bool {
+    @objc func cpk_point(inside point: CGPoint, with event: UIEvent?) -> Bool {
         if let insets = self.cpkTouchInsets {
             let rect = UIEdgeInsetsInsetRect(self.bounds, insets)
             return rect.contains(point)
@@ -740,7 +784,7 @@ extension UIView {
         }
     }
     
-    func cpk_masksToBoundsIfNeed() {
+    @objc func cpk_masksToBoundsIfNeed() {
         self.layer.masksToBounds = false
     }
     
@@ -776,7 +820,7 @@ extension UIView {
         }
     }
     
-    func cpk_onClickHandler() {
+    @objc func cpk_onClickHandler() {
         let callback = cpk_associatedObjectFor(key: "cpk_OnClick")
         
         if let closure = callback as? ()->() {
@@ -883,12 +927,12 @@ extension UITextField {
         set { cpk_setAssociated(object: newValue, forKey: #function); cpk_watchOnEndEvent() }
     }
     
-    public func cpk_textRect(forBounds bounds: CGRect) -> CGRect {
+    @objc public func cpk_textRect(forBounds bounds: CGRect) -> CGRect {
         let rect = self.cpk_textRect(forBounds: bounds)
         return UIEdgeInsetsInsetRect(rect, self.cpkPadding)
     }
     
-    public func cpk_editingRect(forBounds bounds: CGRect) -> CGRect {
+    @objc public func cpk_editingRect(forBounds bounds: CGRect) -> CGRect {
         let rect = cpk_editingRect(forBounds: bounds)
         return UIEdgeInsetsInsetRect(rect, self.cpkPadding)
     }
@@ -905,7 +949,7 @@ extension UITextField {
         addTarget(self, action: sel, for: .editingDidEndOnExit)
     }
     
-    func cpk_textDidChange() {
+    @objc func cpk_textDidChange() {
         let hasMarked = cpk_limitTextInput(self, maxLength: self.cpkMaxLength)
         if !hasMarked {
             if let closure = self.cpkTextChangedClosure as? (UITextField)->() {
@@ -914,7 +958,7 @@ extension UITextField {
         }
     }
     
-    func cpk_didEndOnExit() {
+    @objc func cpk_didEndOnExit() {
         if let closure = self.cpkDidEndOnExistClosure as? (UITextField)->() {
             closure(self)
         }
@@ -948,6 +992,21 @@ extension CPKViewPinOptions : ExpressibleByIntegerLiteral, ExpressibleByFloatLit
 }
 
 
+#if swift(>=4.0)
+extension UILayoutPriority : ExpressibleByIntegerLiteral, ExpressibleByFloatLiteral {
+    public init(integerLiteral value: Int) {
+        self = UILayoutPriority(rawValue: Float(value))
+    }
+    public init(floatLiteral value: Float) {
+        self = UILayoutPriority(rawValue: value)
+    }
+}
+extension NSAttributedStringKey : ExpressibleByStringLiteral {
+    public init(stringLiteral value: String) {
+        self = NSAttributedStringKey(rawValue: value)
+    }
+}
+#endif
 
 
 
@@ -1012,7 +1071,7 @@ public class AlertMaker {
         
         if let attTitle = title as? NSAttributedString {
             titleString = attTitle.string
-            titleColor = attTitle.attribute(NSForegroundColorAttributeName, at: 0, effectiveRange: nil) as? UIColor
+            titleColor = attTitle.attribute("NSColor", at: 0, effectiveRange: nil) as? UIColor
         } else {
             titleString = String(describing: title)
         }
@@ -1216,7 +1275,7 @@ public class Cons: ConsAtts {
     }
     
     private func priorityValue(atIndex index: Int) -> UILayoutPriority {
-        var priority: UILayoutPriority = UILayoutPriorityRequired
+        var priority: UILayoutPriority = 1000
         
         if index < priorityValues.count {
             priority = priorityValues[index]
@@ -1256,7 +1315,11 @@ public class Cons: ConsAtts {
                                        multiplier: multiplier,
                                        constant: constant)
             
+            #if swift(>=4.0)
+            c.priority = priority
+            #else
             c.priority = Float(priority)
+            #endif
             layoutConstraints.append(c)
         }
         
@@ -2212,7 +2275,7 @@ public class StaticRow: UIView {
         return CPKTransformLayer.self
     }
     
-    func switchDidChange() {
+    @objc func switchDidChange() {
         if let callback = onChangeHandler {
             callback(self)
         }
@@ -2511,7 +2574,7 @@ extension UITextView {
         return self.viewWithTag(31415) as? UITextViewPlaceholder
     }
     
-    public func cpk_deinit() {
+    @objc public func cpk_deinit() {
         if let label = self.cpkPlaceholderLabel {
             for keyPath in cpkTextViewObservingKeys {
                 self.removeObserver(label, forKeyPath: keyPath)
@@ -2533,7 +2596,7 @@ extension UITextView {
                                                object: self)
     }
     
-    func cpk_textDidChange() {
+    @objc func cpk_textDidChange() {
         let hasMarked = cpk_limitTextInput(self, maxLength: self.cpkMaxLength)
         if !hasMarked {
             if let closure = self.cpkTextChangedClosure as? (UITextView)->() {
@@ -2774,7 +2837,7 @@ extension UILabel {
         set { cpk_setAssociated(object: newValue, forKey: #function) }
     }
     
-    public func ner_setText(_ text: String) {
+    @objc public func ner_setText(_ text: String) {
         self.ner_setText(text)
         cpk_updateAttributedString()
     }
@@ -2791,7 +2854,7 @@ extension UILabel {
 
 extension UILabel {
     
-    func cpk_handleLinkGesture(_ gesture: LinkGestureRecognizer) {
+    @objc func cpk_handleLinkGesture(_ gesture: LinkGestureRecognizer) {
         
         func cpk_calculateTextYOffset() -> CGFloat {
             let layoutManager = self.cpkLayoutManager
@@ -2832,7 +2895,7 @@ extension UILabel {
                         }
                     }
                     
-                    if let ps = layoutManager.textStorage?.attribute(NSParagraphStyleAttributeName,
+                    if let ps = layoutManager.textStorage?.attribute("NSParagraphStyle",
                                                                      at: range.location,
                                                                      longestEffectiveRange: nil,
                                                                      in: range) as? NSParagraphStyle {
@@ -2877,7 +2940,7 @@ extension UILabel {
                     }
                 }
                 
-                attStr.enumerateAttribute(CPKLabelLinkAttributeName,
+                attStr.enumerateAttribute("CPKLabelLink",
                                           in: fullRange,
                                           options: NSAttributedString.EnumerationOptions.init(rawValue: 0),
                                           using: handler)
@@ -2919,7 +2982,7 @@ extension UILabel {
         }
     }
     
-    func cpk_addHighlightedLayers(for linkInfo: LinkInfo) {
+    @objc func cpk_addHighlightedLayers(for linkInfo: LinkInfo) {
         for rect in linkInfo.boundingRects {
             if rect.size.width > 0 && rect.size.height > 0 {
                 var color = self.cpkLinkSelectionColor ?? UIColor.darkGray
diff --git a/README.md b/README.md
index 4c7445e..8c6e37a 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,8 @@
 </p>
 
 <p align="center">
-<img src="https://camo.githubusercontent.com/085452dbb9eb9e76211db29ac23078836560bbae/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f6c616e67756167652d7377696674253230332d3442433531442e7376673f7374796c653d666c6174" alt="Language" />
+<img src="https://camo.githubusercontent.com/11874553c483b3630dff4ac1e54f1d0fb030bb86/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f53776966742d332e302532422d6f72616e67652e737667" alt="Language" />
+<img src="https://camo.githubusercontent.com/987c5cc551bc4988195dffc73b6822e11eb451cc/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f7377696674342d636f6d70617469626c652d3442433531442e7376673f7374796c653d666c6174" alt="Swift4" />
 <img src="https://camo.githubusercontent.com/1d276aa371242346c77c3a5b8db34beaa2014722/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f694f532d382e302532422d626c75652e737667" alt="Platform" />
 <img src="http://cocoapod-badges.herokuapp.com/v/Cupcake/badge.png" alt="Version" />
 <img src="http://cocoapod-badges.herokuapp.com/l/Cupcake/badge.png" alt="License" />