A small tool class for image cropping. It is called using a code to crop the tool class.

A small tool class for image cropping. It is called using a code to crop the tool class.

Some time ago, I wrote a simple small tool class, that is, image cropping, and animation changes to frame hiding;

This class directly provides a class method call, which can be passed in with three parameters. The code is very simple and can be understood by anyone;

Parameter description:

The first parameter: Specifies the view on which the cropped image is added for animation and the current view;

The second parameter: input an image you want to crop;

The third parameter is the background image. You can add a background (such as a preview image) without passing the background image. For example :@"";

But do not upload nil; otherwise, the console will output an inexplicable statement;

Preview the image effect:

 

The following is the function implementation code:

-YYClipImageTool. h

1 // 2 // YYClipImageTool. h 3 // YYClipImageDemo 4 // 5 // Created by Arvin on 15/12/22. 6 // Copyright©2015 Arvin. All rights reserved. 7 // 8 9 # import <UIKit/UIKit. h> 10 11 @ interface YYClipImageTool: UIImageView12 /**! 13 * @ param view the current View14 * @ param image the image to be cropped 15 * @ param backgroundImage you can set the background image 16 */17 + (void) addToCurrentView :( UIView *) view clipImage :( UIImage *) image backgroundImage :( NSString *) backgroundImage; 18 19 @ end

-YYClipImageTool. m

1 // 2 // YYClipImageTool. m 3 // YYClipImageDemo 4 // 5 // Created by Arvin on 15/12/22. 6 // Copyright©2015 Arvin. all rights reserved. 7 // 8 9 # import "YYClipImageTool. h "10 11 # define Width view. frame. size. width12 # define Height view. frame. size. height13 # define imageW image. size. width14 # define imageH image. size. height * 0.515 # define duration 1.0f // animation duration 16 17 @ interface YYClipImageTool () 18 19 @ end20 21 @ implementation YYClipImageTool22 23 + (void) addToCurrentView :( UIView *) view clipImage :( UIImage *) image backgroundImage :( NSString *) backgroundImage {24 25 // upper half 26 UIImageView * topImgView = [[UIImageView alloc] initWithFrame: CGRectMake (0, 0, Width, height * 0.5)]; 27 topImgView. image = [self clipImage: image withRect: CGRectMake (0, 0, imageW, imageH)]; 28 29 // lower 30 UIImageView * bottomImgView = [[UIImageView alloc] initWithFrame: CGRectMake (0, Height * 0.5, Width, Height * 0.5)]; 31 bottomImgView. image = [self clipImage: image withRect: CGRectMake (0, imageH, imageW, imageH)]; 32 33 // delayed operation 34 dispatch_after (dispatch_time (DISPATCH_TIME_NOW, (int64_t) (2.5f * NSEC_PER_SEC), dispatch_get_main_queue (), ^ {35 // run the animation 36 [UIView animateWithDuration: duration animations: ^ {37 CGRect topRect = topImgView. frame; 38 topRect. origin. y-= imageH; 39 topImgView. frame = topRect; 40 41 CGRect bottomRect = bottomImgView. frame; 42 bottomRect. origin. y + = imageH; 43 bottomImgView. frame = bottomRect; 44}]; 45}); 46 47 // background image 48 UIImageView * bgImage = [[UIImageView alloc] initWithFrame: view. bounds]; 49 bgImage. image = [UIImage imageNamed: backgroundImage]; 50 51 // Add to view 52 [view addSubview: bgImage]; 53 [view addSubview: topImgView]; 54 [view addSubview: bottomImgView]; 55} 56 57 // return the cropped image 58 + (UIImage *) clipImage :( UIImage *) image withRect :( CGRect) rect {59 CGRect clipFrame = rect; 60 CGImageRef refImage = CGImageCreateWithImageInRect (image. CGImage, clipFrame); 61 UIImage * newImage = [UIImage imageWithCGImage: refImage]; 62 CGImageRelease (refImage); 63 return newImage; 64} 65 66/* 67/Only override drawRect: if you perform custom drawing.68 // An empty implementation adversely affects performance during animation.69-(void) drawRect :( CGRect) rect {70 // Drawing code71} 72 */73 74 @ end

This example is called in viewController. m. The Code is as follows:

1 // 2 // ViewController. m 3 // YYClipImageDemo 4 // 5 // Created by Arvin on 15/12/22. 6 // Copyright©2015 Arvin. all rights reserved. 7 // 8 9 # import "ViewController. h "10 # import" YYClipImageTool. h "11 12 @ interface ViewController () 13 14 @ end15 16 @ implementation ViewController17 18-(void) viewDidLoad {19 [super viewDidLoad]; 20 // Do any additional setup after loading the view, typically from a nib.21 22 UIImage * image = [UIImage imageNamed: @ "Default_image"]; 23 [YYClipImageTool addToCurrentView: self. view clipImage: image backgroundImage: @ "bgImage"]; 24} 25 26-(void) didReceiveMemoryWarning {27 [super didreceivemorywarning]; 28 // Dispose of any resources that can be recreated.29} 30 31-(BOOL) prefersStatusBarHidden {32 return YES; 33} 34 35 @ end

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