Custom UIButton image iOS

Question

Is it possible to have a custom UIButton that has an image covering only half of it? I imagine it would be something like this:

UIButton *someButton = [UIButton buttonWithType:UIButtonTypeCustom];
[someButton setBackgroundImage:[UIImage imageNamed:@"buttonPicture"]];

/* Then there must be some property I can set that prevents the button from stretching the image?? */

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I want to have a 50x100px button which only has a 50x50px image on the top half, and to be transparent on the bottom half.

I know how to create a custom button and everything. Im just woondering what the property is that controls the stretching of the backgroundImage.

Thanks!

Answer 1

Use

[someButton setImage:[UIImage imageNamed:@"buttonPicture"] forState: UIControlStateNormal];
 someButton.imageEdgeInsets = UIEdgeInsetsMake(-50, 0, 0, 0);

Answer 2

I think you could:

1. create your button image as a 50x100px image (same size as the button);

2. make this image be half transparent (PNG with alpha),

instead of trying to assign the button a smaller image covering only half of it and prevent stretching.