的iOS滚动视图截图

Question

UIImage* image = nil; 
UIGraphicsBeginImageContextWithOptions(scrollView.contentSize, YES, 0); 
{ 
    CGPoint savedContentOffset = scrollView.contentOffset; 
    CGRect savedFrame = scrollView.frame; 

    scrollView.contentOffset = CGPointZero; 
    scrollView.frame= CGRectMake(0, 0, scrollView.contentSize.width,scrollView.contentSize.height); 

    [scrollView.layer renderInContext: UIGraphicsGetCurrentContext()]; 

    image = UIGraphicsGetImageFromCurrentImageContext(); 

    scrollView.contentOffset = savedContentOffset; 
    scrollView.frame = savedFrame; 
} 
UIGraphicsEndImageContext(); 

我不能得到完整的图像形式滚动视图，但只有一半，一半是黑色

Answer 1

编辑

尝试添加

drawHierarchy(in: self.bounds, afterScreenUpdates: true) 

后线

[scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];