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196 lines
7.5 KiB
Markdown
196 lines
7.5 KiB
Markdown
## RSKImageCropper [](https://travis-ci.org/ruslanskorb/RSKImageCropper) [](https://cocoapods.org/pods/RSKImageCropper) [](https://coveralls.io/r/ruslanskorb/RSKImageCropper) [](https://github.com/ruslanskorb/RSKImageCropper)
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<p align="center">
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<img src="Screenshot.png" alt="Sample">
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</p>
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An image cropper for iOS like in the Contacts app with support for landscape orientation.
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## Installation
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*RSKImageCropper requires iOS 6.0 or later.*
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### Using [CocoaPods](http://cocoapods.org)
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1. Add the pod `RSKImageCropper` to your [Podfile](http://guides.cocoapods.org/using/the-podfile.html).
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pod 'RSKImageCropper'
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2. Run `pod install` from Terminal, then open your app's `.xcworkspace` file to launch Xcode.
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3. Import the `RSKImageCropper.h` header. Typically, this should be written as `#import <RSKImageCropper/RSKImageCropper.h>`
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### Using [Carthage](https://github.com/Carthage/Carthage)
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1. Add the `ruslanskorb/RSKImageCropper` project to your [Cartfile](https://github.com/Carthage/Carthage/blob/master/Documentation/Artifacts.md#cartfile).
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github "ruslanskorb/RSKImageCropper"
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2. Run `carthage update`, then follow the [additional steps required](https://github.com/Carthage/Carthage#adding-frameworks-to-an-application) to add the iOS and/or Mac frameworks into your project.
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3. Import the RSKImageCropper framework/module.
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* Using Modules: `@import RSKImageCropper`
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* Without Modules: `#import <RSKImageCropper/RSKImageCropper.h>`
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## Basic Usage
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Import the class header.
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``` objective-c
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#import <RSKImageCropper/RSKImageCropper.h>
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```
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Just create a view controller for image cropping and set the delegate.
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``` objective-c
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- (IBAction)onButtonTouch:(UIButton *)sender
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{
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UIImage *image = [UIImage imageNamed:@"image"];
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RSKImageCropViewController *imageCropVC = [[RSKImageCropViewController alloc] initWithImage:image];
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imageCropVC.delegate = self;
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[self.navigationController pushViewController:imageCropVC animated:YES];
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}
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```
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## Delegate
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`RSKImageCropViewControllerDelegate` provides three delegate methods. To use them, implement the delegate in your view controller.
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```objective-c
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@interface ViewController () <RSKImageCropViewControllerDelegate>
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```
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Then implement the delegate functions.
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```objective-c
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// Crop image has been canceled.
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- (void)imageCropViewControllerDidCancelCrop:(RSKImageCropViewController *)controller
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{
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[self.navigationController popViewControllerAnimated:YES];
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}
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// The original image has been cropped. Additionally provides a rotation angle used to produce image.
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- (void)imageCropViewController:(RSKImageCropViewController *)controller
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didCropImage:(UIImage *)croppedImage
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usingCropRect:(CGRect)cropRect
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rotationAngle:(CGFloat)rotationAngle
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{
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self.imageView.image = croppedImage;
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[self.navigationController popViewControllerAnimated:YES];
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}
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// The original image will be cropped.
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- (void)imageCropViewController:(RSKImageCropViewController *)controller
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willCropImage:(UIImage *)originalImage
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{
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// Use when `applyMaskToCroppedImage` set to YES.
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[SVProgressHUD show];
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}
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```
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## DataSource
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`RSKImageCropViewControllerDataSource` provides three data source methods. The method `imageCropViewControllerCustomMaskRect:` asks the data source a custom rect for the mask. The method `imageCropViewControllerCustomMaskPath:` asks the data source a custom path for the mask. The method `imageCropViewControllerCustomMovementRect:` asks the data source a custom rect in which the image can be moved. To use them, implement the data source in your view controller.
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```objective-c
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@interface ViewController () <RSKImageCropViewControllerDataSource>
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```
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Then implement the data source functions.
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```objective-c
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// Returns a custom rect for the mask.
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- (CGRect)imageCropViewControllerCustomMaskRect:(RSKImageCropViewController *)controller
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{
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CGSize aspectRatio = CGSizeMake(16.0f, 9.0f);
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CGFloat viewWidth = CGRectGetWidth(controller.view.frame);
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CGFloat viewHeight = CGRectGetHeight(controller.view.frame);
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CGFloat maskWidth;
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if ([controller isPortraitInterfaceOrientation]) {
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maskWidth = viewWidth;
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} else {
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maskWidth = viewHeight;
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}
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CGFloat maskHeight;
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do {
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maskHeight = maskWidth * aspectRatio.height / aspectRatio.width;
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maskWidth -= 1.0f;
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} while (maskHeight != floor(maskHeight));
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maskWidth += 1.0f;
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CGSize maskSize = CGSizeMake(maskWidth, maskHeight);
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CGRect maskRect = CGRectMake((viewWidth - maskSize.width) * 0.5f,
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(viewHeight - maskSize.height) * 0.5f,
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maskSize.width,
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maskSize.height);
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return maskRect;
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}
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// Returns a custom path for the mask.
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- (UIBezierPath *)imageCropViewControllerCustomMaskPath:(RSKImageCropViewController *)controller
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{
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CGRect rect = controller.maskRect;
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CGPoint point1 = CGPointMake(CGRectGetMinX(rect), CGRectGetMaxY(rect));
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CGPoint point2 = CGPointMake(CGRectGetMaxX(rect), CGRectGetMaxY(rect));
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CGPoint point3 = CGPointMake(CGRectGetMaxX(rect), CGRectGetMinY(rect));
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CGPoint point4 = CGPointMake(CGRectGetMinX(rect), CGRectGetMinY(rect));
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UIBezierPath *rectangle = [UIBezierPath bezierPath];
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[rectangle moveToPoint:point1];
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[rectangle addLineToPoint:point2];
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[rectangle addLineToPoint:point3];
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[rectangle addLineToPoint:point4];
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[rectangle closePath];
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return rectangle;
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}
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// Returns a custom rect in which the image can be moved.
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- (CGRect)imageCropViewControllerCustomMovementRect:(RSKImageCropViewController *)controller
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{
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if (controller.rotationAngle == 0) {
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return controller.maskRect;
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} else {
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CGRect maskRect = controller.maskRect;
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CGFloat rotationAngle = controller.rotationAngle;
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CGRect movementRect = CGRectZero;
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movementRect.size.width = CGRectGetWidth(maskRect) * fabs(cos(rotationAngle)) + CGRectGetHeight(maskRect) * fabs(sin(rotationAngle));
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movementRect.size.height = CGRectGetHeight(maskRect) * fabs(cos(rotationAngle)) + CGRectGetWidth(maskRect) * fabs(sin(rotationAngle));
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movementRect.origin.x = CGRectGetMinX(maskRect) + (CGRectGetWidth(maskRect) - CGRectGetWidth(movementRect)) * 0.5f;
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movementRect.origin.y = CGRectGetMinY(maskRect) + (CGRectGetHeight(maskRect) - CGRectGetHeight(movementRect)) * 0.5f;
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movementRect.origin.x = floor(CGRectGetMinX(movementRect));
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movementRect.origin.y = floor(CGRectGetMinY(movementRect));
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movementRect = CGRectIntegral(movementRect);
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return movementRect;
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}
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}
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```
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## Coming Soon
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- If you would like to request a new feature, feel free to raise as an issue.
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## Demo
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Build and run the `RSKImageCropperExample` project in Xcode to see `RSKImageCropper` in action.
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Have fun. Fork and send pull requests. Figure out hooks for customization.
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## Contact
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Ruslan Skorb
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- http://github.com/ruslanskorb
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- http://twitter.com/ruslanskorb
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- ruslan.skorb@gmail.com
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## License
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This project is is available under the MIT license. See the LICENSE file for more info. Attribution by linking to the [project page](https://github.com/ruslanskorb/RSKImageCropper) is appreciated.
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