#import "QYViewController.h"

@interface QYViewController ()<UIScrollViewDelegate>

{

   UIImageView *_imageView;

}

@end

@implementation QYViewController

- (void)viewDidLoad

{

    [superviewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

    //1.添加UIScrollerView

    UIScrollView *scrollView = [[UIScrollViewalloc]init];

    scrollView.frame =self.view.bounds;

    //把scrollView添加到视图

    [self.viewaddSubview:scrollView];

    //2.添加图片

    UIImage *image = [UIImageimageNamed:@"4"];

    _imageView = [[UIImageViewalloc]initWithImage:image];

    //设置代理

    scrollView.delegate =self;

    //设置最小伸缩比例

    scrollView.minimumZoomScale = 0.2;

    //设置最大伸缩比例

    scrollView.maximumZoomScale = 2.0;

    //3.设置内容范围

    scrollView.contentSize = image.size;

    //将_imageView添加到scrollView视图

    [scrollView addSubview:_imageView];

}

#pragma mark - 这个方法返回的控件就能进行捏合手势缩放操作

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

{

    return_imageView;

}

UIScrollView