先确定代理和缩放比例
self.scollView.delegate = self;
self.scollView.maximumZoomScale=2.0;
self.scollView.minimumZoomScale=0.2;
头文件写上代理
@interface ViewController ()<UIScrollViewDelegate>
//代理方法
-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return self.imgView;
}
然后就可以按着option就可以缩放了