image is stretched out if set as background

[Jackson0111]

I'm trying to set an image as background, it works but the image is like stretched out - very ugly lol. Is there a way to fix that? or am I doing something wrong with the image?

[yannickl]

How is it stretched? I think it is the expected behaviour of the UIButton. Have you the same effect with an UIButton?

By default the UIButton stretched the background image, you'll have to the setImage:forState: and use these kind of trick: button.imageView?.contentMode = .Center