UIScrollView截图

如何给UIScrollView截图

    /** 获取scrollView的长截图*/
    - (UIImage *)getLongImage:(UIScrollView *)scrollView
    {
        CGRect oldFrame = scrollView.layer.frame;
        CGSize size = scrollView.contentSize;
        UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale);
        //这里需要你修改下layer的frame,不然只会截出在屏幕显示的部分
        scrollView.layer.frame = CGRectMake(0, 0, size.width, size.height);
        [scrollView.layer renderInContext:UIGraphicsGetCurrentContext()];
        UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        scrollView.layer.frame = oldFrame;
        return image;
    }