UIScrollView

#import "QYViewController.h"

@interface QYViewController ()<UIScrollViewDelegate>

{

    UIImageView *_imageView;

}

@end

@implementation QYViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

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

    //1.加入UIScrollerView

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

    scrollView.frame = self.view.bounds;

    //把scrollView加入到视图

    [self.view addSubview:scrollView];

    //2.加入图片

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

    _imageView = [[UIImageView alloc]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加入到scrollView视图

    [scrollView addSubview:_imageView];

    

}

#pragma mark - 这种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;

}