Click the image to zoom in. Click it again to zoom in and zoom out.

Click the image to zoom in. Click it again to zoom in and zoom out.
First, write a class write amplification method.

//// BigImage. h // TapImageBigAndSmall /// Created by lxy on 15-4-7. // Copyright (c) 2015 Shenzhen MSD Technology Co ., LTD. all rights reserved. // # import <Foundation/Foundation. h> # import <UIKit/UIKit. h> @ interface BigImage: NSObject + (void) showImage :( UIImageView *) avatarImageView; + (void) hideImage :( UITapGestureRecognizer *) tap; @ end

Implementation Method

//// BigImage. m // TapImageBigAndSmall /// Created by lxy on 15-4-7. // Copyright (c) 2015 Shenzhen MSD Technology Co ., LTD. all rights reserved. // # import "BigImage. h "@ implementation BigImagestatic CGRect oldframe; + (void) showImage :( UIImageView *) avatarImageView {UIImage * image = avatarImageView. image; UIWindow * window = [UIApplication sharedApplication]. keyWindow; UIView * backgroundView = [[UIView alloc] initWithFrame: CGRectMake (0, 0, [UIScreen mainScreen]. bounds. size. width, [UIScreen mainScreen]. bounds. size. height)]; oldframe = [avatarImageView convertRect: avatarImageView. bounds toView: window]; backgroundView. backgroundColor = [UIColor blackColor]; backgroundView. alpha = 0; UIImageView * imageView = [[UIImageView alloc] initWithFrame: oldframe]; imageView. image = image; imageView. tag = 1; [backgroundView addSubview: imageView]; [window addSubview: backgroundView]; optional * tap = [[using alloc] initWithTarget: self action: @ selector (hideImage :)]; [backgroundView addGestureRecognizer: tap]; [UIView animateWithDuration: 0.3 animations: ^ {imageView. frame = CGRectMake (0, ([UIScreen mainScreen]. bounds. size. height-image.size.height * [UIScreen mainScreen]. bounds. size. width/image. size. width)/2, [UIScreen mainScreen]. bounds. size. width, image. size. height * [UIScreen mainScreen]. bounds. size. width/image. size. width); backgroundView. alpha = 1 ;}completion: ^ (BOOL finished) {}] ;}+ (void) hideImage :( UITapGestureRecognizer *) tap {UIView * backgroundView = tap. view; UIImageView * imageView = (UIImageView *) [tap. view viewWithTag: 1]; [UIView animateWithDuration: 0.3 animations: ^ {imageView. frame = oldframe; backgroundView. alpha = 0 ;}completion: ^ (BOOL finished) {[backgroundView removeFromSuperview] ;}] ;}@ end

In View Controller

//// ViewController. m // TapImageBigAndSmall /// Created by lxy on 15-4-7. // Copyright (c) 2015 Shenzhen MSD Technology Co ., LTD. all rights reserved. // # import "ViewController. h "# import" BigImage. h "@ interface ViewController () @ property (nonatomic, strong) UIImageView * image; @ end @ implementation ViewController-(void) viewDidLoad {[super viewDidLoad]; self. view. backgroundColor = [UIColor magentaColor]; self. image = [[[UIImageView alloc] initWithFrame: CGRectMake (100,100,100,100)]; _ image. image = [UIImage imageNamed: @ "me"]; _ image. userInteractionEnabled = YES; [self. view addSubview: _ image];/*** Add a gesture to the image. Click to enlarge the image. */UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc] initWithTarget: self action: @ selector (tapClick)]; [self. image addGestureRecognizer: tap];/*** an image is circled around a circle * // [self AnimationStart];}-(void) tapClick {[BigImage showImage: _ image];}-(void) AnimationStart {UIImage * image = [UIImage imageNamed: @ "me"]; CALayer * flyStarLayer = [CALayer layer]; flyStarLayer. bounds = CGRectMake (0, 0, 20, 20); flyStarLayer. contents = (id) image. CGImage; [self. view. layer addSublayer: flyStarLayer]; CAKeyframeAnimation * keyAnimation = [CAKeyframeAnimation animationWithKeyPath: @ "position"]; keyAnimation. duration = 5.0; keyAnimation. removedOnCompletion = NO; // NSNumber * number1 = [NSNumber numberWithFloat: 0.0]; // NSNumber * number2 = [NSNumber numberWithFloat: 0.2]; // NSNumber * number3 = [NSNumber limit: 0.8]; // keyAnimation. keyTimes = [NSArray arrayWithObjects: number1, number2, number3, nil]; keyAnimation. fillMode = kCAFillModeForwards; keyAnimation. repeatCount = 1; CGMutablePathRef circlePath = CGPathCreateMutable (); CGPathAddArc (circlePath, nil, 100,150, 50, 0, 4 * M_PI, 0); keyAnimation. path = circlePath; CGPathRelease (circlePath); [flyStarLayer addAnimation: keyAnimation forKey: nil];}