When UIButton content mode is "center," background image is pixelated.

Question

Here's how I'm setting the background image and content mode:

[btn setBackgroundImage:[[UIImage alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"dots_game_horiz_blue" ofType:@"png"]] forState:UIControlStateNormal];
[btn setContentMode:UIViewContentModeCenter];

Is there a reason that the background image would be pixelated? The frame is slightly larger than the image size, and I just want the image to be centered.

Answer 1

I guess a background image is not considered to be "content" by the UIButton, so the content mode did not apply to the background image. Instead, I set the image of the button and it worked just fine:

[btn setImage:[[UIImage alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"dots_game_horiz_blue" ofType:@"png"]] forState:UIControlStateNormal];
[btn setContentMode:UIViewContentModeCenter];