When I rotate an UIImageView with the transform property, the edges pixellate

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How to do antialiasing on a rotated view?

I'm trying to rotate some UIImageViews using this technique:

imageView.transform = CGAffineTransformMakeRotation(r);

where r is a float usually between -0.3 and 0.3.

The problem is that the images (which are derived from square jpegs) that are rotated have jagged edges (pixellation), because they are at an angle after the transform. Is there a way to fix this so the edges are smooth (i.e. antialiased)?

I can't use vector art in this case. How do I apply anti-aliasing? — dan, Aug 16 '11 at 15:02
I would like to know that as well :) - could you edit your question so it mentions AA? — Alex Coplan, Aug 16 '11 at 15:40

score 12 · Accepted Answer · answered Aug 16 '11 at 15:59

12

There is a key that you can set in Info.plist that enables antialiasing of the edges: UIViewEdgeAntialiasing.

http://developer.apple.com/library/ios/#documentation/general/Reference/InfoPlistKeyReference/Articles/iPhoneOSKeys.html

answered Aug 16 '11 at 15:59

Johan Kool

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Great..In your info.plist set : "Renders with edge antialiasing" YES – Muzammil Feb 05 '14 at 14:23
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yeah, it works well in layer,but i found the subview of view still has antialiasing – andyqee Aug 04 '14 at 11:36

When I rotate an UIImageView with the transform property, the edges pixellate

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