当我拍摄滚动视图的屏幕截图时，UISegmentedControl中所选片段的标题会消失

Question

这是我的代码，用于截取我的scrollview的截图：

UIImage* image = nil;
UIGraphicsBeginImageContextWithOptions(_scrollView.contentSize, _scrollView.opaque, 0.0);
        {
            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()];
         }

我试过这个没有成功：

[_scrollView drawViewHierarchyInRect:_scrollView.bounds afterScreenUpdates:YES];