UIButton won't go to Aspect Fit in iPhone

Question

I have a couple UIButtons, and in IB they're set to Aspect Fit, but for some reason they're always stretching. Is there something else you have to set? I tried all the different view modes and none of them work, they all stretch.

Answer 1

I've had that problem before. I solved it by putting my image in a UIImageView, where contentMode settings actually work, and putting a transparent custom UIButton over top of that.

Answer 2

I had the same issue, but I couldn't get it to work (perhaps it's a bug with the SDK).

Eventually, as a workaround, I placed a UIImageView behind my button and set the options I wanted on that, then simply placed a blank UIButton on top of it.

Answer 3

UIView content modes apply to the corresponding CALayer's "content". This works for UIImageViews because they set the CALayer content to the corresponding CGImage.

drawRect: ultimately renders to the layer content.

A custom UIButton (as far as I know) has no content (the rounded-rect style buttons might be rendered using content). The button has subviews: the background UIImageView, the image UIImageView, and the title UILabel. Setting the contentMode on the subviews may do what you want, but messing around with the UIButton view hierarchy is a bit of a no-no.

Answer 4

The solution is to set the contentMode on the imageView property of the UIButton. The UIButton has to be created with custom type for this to work I believe (otherwise nil is returned for this property).