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
    
      @interfaceSJAvatarBrowser : 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

#import"SJAvatarBrowser.h"staticCGRect oldframe;@implementationSJAvatarBrowser+(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}

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