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 @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
#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 }
转载请声明源地址http://blog.csdn.net/u013082522/article/details/18445901