Code Quality Rank: L1
Programming language: Objective-C
License: MIT License
Tags: Media     Image    
Latest version: v3.0.0

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RSKImageCropper Build Status Coverage Status Carthage compatible

An image cropper for iOS like in the Contacts app with support for landscape orientation.


RSKImageCropper requires iOS 9.0 or later.

Using Swift Package Manager

  1. To add the RSKImageCropper package to your Xcode project, select File > Swift Packages > Add Package Dependency and enter the repository URL.


Using CocoaPods

  1. Add the pod RSKImageCropper to your Podfile.

    pod 'RSKImageCropper'
  2. Run pod install from Terminal, then open your app's .xcworkspace file to launch Xcode.

  3. Import the RSKImageCropper.h header. Typically, this should be written as #import <RSKImageCropper/RSKImageCropper.h>

Using Carthage

  1. Add the ruslanskorb/RSKImageCropper project to your Cartfile.

    github "ruslanskorb/RSKImageCropper"
  2. Run carthage update, then follow the additional steps required to add the iOS and/or Mac frameworks into your project.

  3. Import the RSKImageCropper framework/module.

    • Using Modules: @import RSKImageCropper
    • Without Modules: #import <RSKImageCropper/RSKImageCropper.h>

Basic Usage

Import the class header.

#import <RSKImageCropper/RSKImageCropper.h>

Just create a view controller for image cropping and set the delegate.

- (IBAction)onButtonTouch:(UIButton *)sender
    UIImage *image = [UIImage imageNamed:@"image"];
    RSKImageCropViewController *imageCropVC = [[RSKImageCropViewController alloc] initWithImage:image];
    imageCropVC.delegate = self;
    [self.navigationController pushViewController:imageCropVC animated:YES];


RSKImageCropViewControllerDelegate provides three delegate methods. To use them, implement the delegate in your view controller.

@interface ViewController () <RSKImageCropViewControllerDelegate>

Then implement the delegate functions.

// Crop image has been canceled.
- (void)imageCropViewControllerDidCancelCrop:(RSKImageCropViewController *)controller
    [self.navigationController popViewControllerAnimated:YES];

// The original image has been cropped. Additionally provides a rotation angle used to produce image.
- (void)imageCropViewController:(RSKImageCropViewController *)controller
                   didCropImage:(UIImage *)croppedImage
    self.imageView.image = croppedImage;
    [self.navigationController popViewControllerAnimated:YES];

// The original image will be cropped.
- (void)imageCropViewController:(RSKImageCropViewController *)controller
                  willCropImage:(UIImage *)originalImage
    // Use when `applyMaskToCroppedImage` set to YES.
    [SVProgressHUD show];


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.

@interface ViewController () <RSKImageCropViewControllerDataSource>

Then implement the data source functions.

// Returns a custom rect for the mask.
- (CGRect)imageCropViewControllerCustomMaskRect:(RSKImageCropViewController *)controller
    CGSize aspectRatio = CGSizeMake(16.0f, 9.0f);

    CGFloat viewWidth = CGRectGetWidth(controller.view.frame);
    CGFloat viewHeight = CGRectGetHeight(controller.view.frame);

    CGFloat maskWidth;
    if ([controller isPortraitInterfaceOrientation]) {
        maskWidth = viewWidth;
    } else {
        maskWidth = viewHeight;

    CGFloat maskHeight;
    do {
        maskHeight = maskWidth * aspectRatio.height / aspectRatio.width;
        maskWidth -= 1.0f;
    } while (maskHeight != floor(maskHeight));
    maskWidth += 1.0f;

    CGSize maskSize = CGSizeMake(maskWidth, maskHeight);

    CGRect maskRect = CGRectMake((viewWidth - maskSize.width) * 0.5f,
                                 (viewHeight - maskSize.height) * 0.5f,

    return maskRect;

// Returns a custom path for the mask.
- (UIBezierPath *)imageCropViewControllerCustomMaskPath:(RSKImageCropViewController *)controller
    CGRect rect = controller.maskRect;
    CGPoint point1 = CGPointMake(CGRectGetMinX(rect), CGRectGetMaxY(rect));
    CGPoint point2 = CGPointMake(CGRectGetMaxX(rect), CGRectGetMaxY(rect));
    CGPoint point3 = CGPointMake(CGRectGetMaxX(rect), CGRectGetMinY(rect));
    CGPoint point4 = CGPointMake(CGRectGetMinX(rect), CGRectGetMinY(rect));

    UIBezierPath *rectangle = [UIBezierPath bezierPath];
    [rectangle moveToPoint:point1];
    [rectangle addLineToPoint:point2];
    [rectangle addLineToPoint:point3];
    [rectangle addLineToPoint:point4];
    [rectangle closePath];

    return rectangle;

// Returns a custom rect in which the image can be moved.
- (CGRect)imageCropViewControllerCustomMovementRect:(RSKImageCropViewController *)controller
    if (controller.rotationAngle == 0) {
        return controller.maskRect;
    } else {
        CGRect maskRect = controller.maskRect;
        CGFloat rotationAngle = controller.rotationAngle;

        CGRect movementRect = CGRectZero;

        movementRect.size.width = CGRectGetWidth(maskRect) * fabs(cos(rotationAngle)) + CGRectGetHeight(maskRect) * fabs(sin(rotationAngle));
        movementRect.size.height = CGRectGetHeight(maskRect) * fabs(cos(rotationAngle)) + CGRectGetWidth(maskRect) * fabs(sin(rotationAngle));

        movementRect.origin.x = CGRectGetMinX(maskRect) + (CGRectGetWidth(maskRect) - CGRectGetWidth(movementRect)) * 0.5f;
        movementRect.origin.y = CGRectGetMinY(maskRect) + (CGRectGetHeight(maskRect) - CGRectGetHeight(movementRect)) * 0.5f;

        movementRect.origin.x = floor(CGRectGetMinX(movementRect));
        movementRect.origin.y = floor(CGRectGetMinY(movementRect));
        movementRect = CGRectIntegral(movementRect);

        return movementRect;

Coming Soon

  • If you would like to request a new feature, feel free to raise as an issue.


Build and run the RSKImageCropperExample project in Xcode to see RSKImageCropper in action. Have fun. Fork and send pull requests. Figure out hooks for customization.


Ruslan Skorb


This project is is available under the MIT license. See the LICENSE file for more info. Attribution by linking to the project page is appreciated.

*Note that all licence references and agreements mentioned in the RSKImageCropper README section above are relevant to that project's source code only.