图片点击放大,再次点击返回原视图.完美封装,一个类一句代码即可调用.IOS完美实现

本文介绍了一个简单的iOS图片放大查看解决方案，通过自定义类SJAvatarBrowser实现了图片点击放大及返回原视图的功能。该方案仅需引入一个类并设置一行代码即可轻松调用。

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图片点击放大,再次点击返回原视图.完美封装,一个类一句代码即可调用.IOS完美实现

创建了一个专门用于放大图片的类,以下为.h文件

[objc]view plain copy 
   
 
 #import <Foundation/Foundation.h>  
   
 @interface SJAvatarBrowser : NSObject  
 /** 
  *  @brief  浏览头像 
  * 
  *  @param  oldImageView    头像所在的imageView 
  */  
 +(void)showImage:(UIImageView*)avatarImageView;  
   
 @end  

以下为.m文件

[objc]view plain copy 
   
 
 #import "SJAvatarBrowser.h"  
 static CGRect oldframe;  
 @implementation SJAvatarBrowser  
 +(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];  
       
     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*[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  

引入此类之后,为自己需要放大的imageView添加tap手势

[objc]view plain copy 
   
 UITapGestureRecognizer *tap  = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(magnifyImage)];  
   
     [self.imageView addGestureRecognizer:tap];

[objc]view plain copy 
   
 
 - (void)magnifyImage  
 {  
     NSLog(@"局部放大");  
     [SJAvatarBrowser showImage:self.imageView];//调用方法  
 }  

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