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Editorial Team
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Asked: 2026-05-11T20:21:03+00:00

I have a ball assigned to a UIImageView in Interface Builder. An IBOutlet from

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I have a ball assigned to a UIImageView in Interface Builder. An IBOutlet from the UIImageView is wired to a corresponding UIViewController. The image has a white background. When I assign it to the UIImageView in IB, the background is transparent. In IB, I have the UIImageView set to a transparent background and aspect fill.

When I assign the UIImageView an image at runtime:

self.ball.image = ballImage; //ballImage is a UIImage
self.ball.backgroundColor = [UIColor clearColor];
self.ball.contentMode = UIViewContentModeScaleAspectFill;

the UIImageView square has a white background where the ball doesn’t display. Meaning all four corners. What is the difference that the IB version doesn’t show a white background at runtime and the programmatic version does?

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1 Answer

  1. Editorial Team

    Make sure you set self.ball.opaque = NO; in addition to setting the background color to clear. Otherwise, a white background will still be drawn. I believe you have to set both of these whether you use IB or Xcode to create the view – but IB may have set them both for you.

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