iOS开发---点击查看缩略图

.h文件

#import <Foundation/Foundation.h>

@interface RMAvatarBrowser : NSObject

// 实现缩略图片
+ (void)showImage:(UIImageView *)avatarImageView;

@end

.m文件

#import "RMAvatarBrowser.h"

static CGRect oldFrame;

@implementation RMAvatarBrowser

+ (void)showImage:(UIImageView *)avatarImageView
{
    UIImage *image = avatarImageView.image;
    UIWindow *window = [UIApplication sharedApplication].keyWindow;
    UIView *backgroundView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds];
    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

转自http://blog.csdn.net/u013082522/article/details/18445901