Fix RxExample warnings

RxExample/RxExample/Example.swift

@@ -33,13 +33,3 @@ extension String {
         return numberFormatter.number(from: self)?.doubleValue
     }
 }
-
-func showAlert(_ message: String) {
-    #if os(iOS)
-        UIAlertView(title: "RxExample", message: message, delegate: nil, cancelButtonTitle: "OK").show()
-    #elseif os(macOS)
-        let alert = NSAlert()
-        alert.messageText = message
-        alert.runModal()
-    #endif
-}

RxExample/RxExample/Examples/GitHubSearchRepositories/GitHubSearchRepositoriesViewController.swift

@@ -83,8 +83,18 @@ class GitHubSearchRepositoriesViewController: ViewController, UITableViewDelegat
             .map { $0.isLimitExceeded }
             .distinctUntilChanged()
             .filter { $0 }
-            .drive(onNext: { n in
-                showAlert("Exceeded limit of 10 non authenticated requests per minute for GitHub API. Please wait a minute. :(\nhttps://developer.github.com/v3/#rate-limiting") 
+            .drive(onNext: { [weak self] n in
+                guard let self = self else { return }
+
+                let message = "Exceeded limit of 10 non authenticated requests per minute for GitHub API. Please wait a minute. :(\nhttps://developer.github.com/v3/#rate-limiting"
+
+                #if os(iOS)
+                self.present(UIAlertController(title: "RxExample", message: message, preferredStyle: .alert), animated: true)
+                #elseif os(macOS)
+                let alert = NSAlert()
+                alert.messageText = message
+                alert.runModal()
+                #endif
             })
             .disposed(by: disposeBag)
 

RxExample/RxExample/Examples/SimpleValidation/SimpleValidationViewController.swift

@@ -62,14 +62,12 @@ class SimpleValidationViewController : ViewController {
     }
 
     func showAlert() {
-        let alertView = UIAlertView(
+        let alert = UIAlertController(
             title: "RxExample",
             message: "This is wonderful",
-            delegate: nil,
-            cancelButtonTitle: "OK"
+            preferredStyle: .alert
         )
 
-        alertView.show()
+        show(alert, sender: nil)
     }
-
 }