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