iOS缩放图片

1,将UIImageView addSubView到UIScrollView中

2,设置UIScrollView的delegate

3,设置UIScrollView的两个属性:maximumZoomScale,minimumZoomScale,例如:

self.sc.maximumZoomScale = 2.0;

self.sc.minimumZoomScale = 0.2;

 

4,实现UIScrollView的一个delegate方法:

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

    

    return self.imageView;//self.imageView就是添加到UIScrollView里面的UIImageView

}

 

5,run,看结果.