iOS 点击全屏查看图片

项目中显示后台下发的缩略图，点击缩略图放大全屏查看，现在是直接放大图片，当然你也可以使用在分页的UIScrollView上添加图片来进行展示。

• 步骤分为三步

1.创建UIImageView
注:采用EGOImageView是因为加载的是url，直接引用的三方库:
pod 'EGOImageLoading', '~> 0.0.1'

    //初始化要显示的图片内容的imageView（这里位置是使用当前屏幕的 宽和高宏定义）
    EGOImageView *imgView = [[EGOImageView alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, kScreenHeight)];
//图片背景色设置成黑色(必须)
    imgView.backgroundColor = [UIColor blackColor];
    //要显示的图片，即要放大的图片(放大图片的填充方式)
    [imgView setContentMode:UIViewContentModeScaleAspectFit];
    [imgView setImageURL:[NSURL URLWithString:imgArray[sender.tag]]];
    imgView.userInteractionEnabled = YES;

2.以动画方式添加到window上

    UIWindow * window = [UIApplication sharedApplication].keyWindow;
    [window addSubview:imgView];
    [self shakeToShow:imgView];


//放大过程中出现的缓慢动画
- (void) shakeToShow:(UIView*)aView{
    CAKeyframeAnimation* animation = [CAKeyframeAnimation animationWithKeyPath:@"transform"];
    animation.duration = 0.2;
    NSMutableArray *values = [NSMutableArray array];
    [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.1, 0.1, 1.0)]];
    [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.0, 1.0, 1.0)]];
    animation.values = values;
    [aView.layer addAnimation:animation forKey:nil];
}

3.在UIImageView上添加手势，点击取消显示当前图片

//添加点击手势（即点击图片后退出全屏）
    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(closeView:)];
    [imgView addGestureRecognizer:tapGesture];


- (void)closeView:(UITapGestureRecognizer *)tap {
    
    [tap.view removeFromSuperview];
}