Question

I would like to create a UIButton which uses a stretchable image as Background image such as that I can easily resize the button for different labels etc.

So I created the following code which works fine:

UIImage *bgImage = [[UIImage imageNamed:@"Button-Template.png"]stretchableImageWithLeftCapWidth:2 topCapHeight:2];
UIButton *loginButton = [UIButton buttonWithType:UIButtonTypeCustom];
loginButton.frame = CGRectMake(180, 280, 112, 40);
[loginButton setBackgroundImage:bgImage forState:UIControlStateNormal];
// some more stuff

Now here is the catch: The iPhone SDK assumes that the strechable part of the image is exactly one pixel in width, which is not the case in my image as I want to create a pattern, which requires a repetition every two pixels (so 2 Pixels are one pattern unit). I have found no information in the docs whether it is possible to alter the value of the strechable part width (in my case 2 instead of 1), does anybody know how to do this or how I could achieve my goal with a workaround? Writing the stretching part on my own seems a little far fetched right now (though I might have to get back to this).

Thanks!

Answer 1

There is no API for using 2 pixels as the stretch width. You’ll have to implement this behaviour yourself in a custom view, or use an image with a specific width.