Get a screenshot of a uiscrollview, including off screen parts

problem ：

I have a UIScrollView decendent that implements a takeScreenshot method that looks like this: I have one UIScrollView A successor , It implements a takeScreenshot Method ：

-(void)takeScreenshot {    CGRect contextRect  = CGRectMake(0, 0, 768, 1004);  UIGraphicsBeginImageContext(contextRect.size);      [self.layer renderInContext:UIGraphicsGetCurrentContext()];  UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();  UIGraphicsEndImageContext();  // do something with the viewImage here.}

This basically moves to the top of the scroll view, and takes a screenshot of the visible area. This basically moves to the top of the scrolling view , And take a screenshot of the visible area .It works fine when the iPad is oriented portrait, but when it's in landscape the bottom of the image is cut off (as the height of the visible area is only 748, not 1004). When iPad It works normally when facing vertically , But when it is horizontal , The bottom of the image is cut off （ Because the height of the visible area is only 748, instead of 1004）.

Is it possible to get a snapshot of the UIScrollView , including areas not on screen? Whether you can get UIScrollView Snapshot , Include areas that are not on the screen ？Or do I need to scroll the view down, take a second photo and stitch them together? Or do I need to scroll down the view , Take a second picture and put them together ？

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Solution ：

Reference resources ： https://stackoom.com/en/question/EqqD