iOS开发——UIImageView

　　1.图像点击之后，全屏浏览

- (void)viewDidLoad {

　　[super viewDidLoad];

　　_myImage=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, klScreenWidth, klScreenHeight-270)];

    _myImage.userInteractionEnabled=YES;

    [self.scrollview addSubview:_myImage];

    

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

    tapGesture.numberOfTapsRequired=1;

    [_myImage addGestureRecognizer:tapGesture];

}

 

-(void)showZoomImageView:(UITapGestureRecognizer *)tap

{

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

        return;

    }

    

    //scrollView作为背景

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

    bgView.frame = [UIScreen mainScreen].bounds;

    bgView.backgroundColor = [UIColor blackColor];

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

    [bgView addGestureRecognizer:tapBg];

    

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

    

    UIImageView *imageView = [[UIImageView alloc] init];

    imageView.image = picView.image;

    imageView.frame = [bgView convertRect:picView.frame fromView:self.view];

    [bgView addSubview:imageView];

    

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

    

    [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;

    }];

}

 

　　2.图片的缩放

@interface ViewController () <UIScrollViewDelegate>{

    UIScrollView *_scrollview;

    UIImageView *_imageview;

}

 

- (void)viewDidLoad {

    [super viewDidLoad];

 

    _scrollview=[[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height)];

    _scrollview.delegate=self;

    //设置最大伸缩比例

    _scrollview.maximumZoomScale=5.0;

    //设置最小伸缩比例

    _scrollview.minimumZoomScale=1;

    [self.view addSubview:_scrollview];

    

    UIImage *image=[UIImage imageNamed:@"1"];

    _imageview=[[UIImageView alloc]initWithImage:image];

    _imageview.frame = CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height);

    _imageview.userInteractionEnabled = YES;

    [_scrollview addSubview:_imageview];

}

 

-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{

    return _imageview;

}