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;

}