Draw UIView and all its subview to Context

Question

a UIView is created and small snow.png is kept added and removed to UIView to simulate the snowing effect.

Then I would like to capture the screen as an image.

UIGraphicsBeginImageContext(self.uiviewPreview.bounds.size);
[self.uiviewPreview.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

Note: self.uiviewPreview is the UIView.

But I can only see the image in UIview in the saved jpg. But all added subviews at that moment are not saved.

I would like to know whether renderInContext is correct or not to use

score 1 · Accepted Answer · answered Oct 18 '11 at 03:37

1

It's the right method and it should work.

Note that the method has one big flaw, it doesn't reflect the actual state of layer animations (alpha, autoresizing, repositioning etc.). If you are drawing the layer while animating it, it won't work.

answered Oct 18 '11 at 03:37

Sulthan

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layer renderInContext does not do subviews, you have to do that yourself – jjxtra Mar 15 '13 at 22:18

Draw UIView and all its subview to Context

1 Answers1