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

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
}