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

#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</foundation>

以下为.m文件

#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

UITapGestureRecognizer
 *tap  = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(magnifyImage)];

 

[self.imageView addGestureRecognizer:tap];

-(void)magnifyImage

{

    NSLog(@"局部放大");

    [SJAvatarBrowser
 showImage:self.imageView];//调用方法

}

分享来源：
http://blog.csdn.net/ssrrxx11...