iOS开发---点击查看缩略图

#import <Foundation/Foundation.h>

@interface RMAvatarBrowser : NSObject

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

@end

#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