How to make smoothing in a rotated form?

Question

Possible duplicate:
Any quick and dirty smoothing methods for rotated UIImageView?

when the UIView is rotated, the borders become incredibly ugly. There is no smoothing at all. Also, if it is a UIImageView, there is no smoothing when the transformation matrix is ​​rotated. Is there a way to achieve smooth edges and smooth rotation of images?

Answer 1

For UIImageView, add a transparent border around the single-pixel image. This will cause the edges of your image to be inside the “inside,” and since the internal pixels will be interpolated during rotation, the borders will be magically smoothed. It also works for rotating UIButtons that have a custom image.