iOS点击图片放大 再点击缩小

#import <Foundation/Foundation.h>

@interface MPAvatarBrowser : NSObject

+(void)showImage:(UIImageView*)avatarImageView;

@end

#import "MPAvatarBrowser.h"

static CGRect oldframe;

@implementation MPAvatarBrowser

+(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,
[UIScreenmainScreen].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];

  

  UITapGestureRecognizer *tap=[[UITapGestureRecognizer 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*[UIScreenmainScreen].bounds.size.width/image.size.width)/2,
[UIScreen mainScreen].bounds.size.width,
image.size.height*[UIScreenmainScreen].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

然后调入头文件

调用

 [MPAvatarBrowser showImage:weakCell.shopCartImage];