缩放子控件

 

 

#import "ViewController.h"

 

@interfaceViewController ()<UIScrollViewDelegate>

 

@property (strong, nonatomic) UIImageView *imageView;

 

@end

 

@implementation ViewController

 

- (void)viewDidLoad {

    [superviewDidLoad];

    

    UIScrollView *scrolView = [[UIScrollViewalloc]initWithFrame:self.view.bounds];

    

    // 要实现缩放，就必须告诉scrollView的代理我要缩放哪个子控件（只能缩放内部的子控件）

    

    

    scrolView.delegate = self;

    

    scrolView.minimumZoomScale = 0.5;

    scrolView.maximumZoomScale = 2;

    

    // 内部自动调用

//    [self viewForZoomingInScrollView:scrolView];

    

    // imageView的size默认就是图片的大小

    UIImageView *imageView = [[UIImageViewalloc]initWithImage:[UIImageimageNamed:@"0.jpeg"]];

    self.imageView = imageView;

    

    scrolView.contentSize = CGSizeMake(imageView.bounds.size.width,imageView.bounds.size.height);

    

    [scrolView addSubview:imageView];

    [self.viewaddSubview:scrolView];

}

 

 

 

-(UIImageView *)viewForZoomingInScrollView:(UIScrollView *)scrollView

{

    returnself.imageView;

}

 

 

// 正在缩放时调用，一直调用（无数次）

-(void)scrollViewDidZoom:(UIScrollView *)scrollView

{

//    NSLog(@"scrollViewDidZoom------");

}

 

 

// 缩放完毕调一次

-(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale

{

//    NSLog(@"scrollViewDidEndZooming-%@--%f---",view,scale);

}

 

// 每次拖动调用一次

-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView

{

    NSLog(@"scrollViewWillBeginDragging----");

}

 

@end