iOS开发——点击图片全屏显示

　　点击图片，全屏显示，然后再点击屏幕一下，返回。

　　没啥难的，直接上代码：

//

//  ViewController.m

//  Demo-hehe

//

//  Created by yyt on 16/4/25.

//  Copyright © 2016年 yyt. All rights reserved.

//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    

    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(20, 80, self.view.bounds.size.width-40, 300)];

    imageView.image = [UIImage imageNamed:@"11"];

    imageView.userInteractionEnabled = YES;

    [self.view addSubview:imageView];

    

    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(showZoomImageView:)];

    tapGesture.numberOfTapsRequired=1;

    [imageView addGestureRecognizer:tapGesture];

}

//缩放图片

-(void)showZoomImageView:(UITapGestureRecognizer *)tap

{

    if (![(UIImageView *)tap.view image]) {

        return;

    }

    

    UIView *bgView = [[UIView alloc] init];

    bgView.frame = [UIScreen mainScreen].bounds;

    bgView.backgroundColor = [UIColor blackColor];

    [[[UIApplication sharedApplication] keyWindow] addSubview:bgView];

    

    UITapGestureRecognizer *tapBgView = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapBgView:)];

    [bgView addGestureRecognizer:tapBgView];

    

    //必不可少的一步，如果直接把点击获取的imageView拿来玩的话，返回的时候，原图片就完蛋了

    UIImageView *tempImageView = (UIImageView*)tap.view;

    

    UIImageView *imageView = [[UIImageView alloc] initWithFrame:tempImageView.frame];

    imageView.image = tempImageView.image;

    [bgView addSubview:imageView];

    

    [UIView animateWithDuration:0.5 animations:^{

        CGRect frame = imageView.frame;

        frame.size.width = bgView.frame.size.width;

        frame.size.height = frame.size.width * (imageView.image.size.height / imageView.image.size.width);

        frame.origin.x = 0;

        frame.origin.y = (bgView.frame.size.height - frame.size.height) * 0.5;

        imageView.frame = frame;

    }];

}

-(void)tapBgView:(UITapGestureRecognizer *)tapBgRecognizer

{

    [tapBgRecognizer.view removeFromSuperview];

}

@end