如何拍摄滚动视图的屏幕截图并附加到电子邮件？

Question

我有一个UIScrollView，其中包含需要通过电子邮件发送的内容。屏幕截图仅捕获屏幕上的可见区域。滚动视图大小为768 x 2000.我目前使用的方法如下：

- (IBAction) Email
{
    UIImage* image = nil;

    UIGraphicsBeginImageContext(_scrollView.contentSize);
    {
        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();

    NSData * imageData = UIImageJPEGRepresentation(image, 0.95);


    if ([MFMailComposeViewController canSendMail]) {

        MFMailComposeViewController *mc = [[MFMailComposeViewController alloc] init];
        mc.mailComposeDelegate = self;

        [mc addAttachmentData:imageData mimeType:@"image/jpeg" fileName:@"Attachment.jpeg"];
        [self presentModalViewController:mc animated:YES];

    }
}

感谢您的回复。我意识到我只有滚动视图作为插座而不是属性。将代码更改为以下内容并修复了问题;