PNG transparency in Interface Builder

I'm adding an Image View in Interface Builder with a transparent PNG (A logo in the Navigation Bar) but th开发者_Go百科e transparent pixels seems to render as white..

I searched for PNG in Interface Builder but no luck. any tips?

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Make sure the "Opaque" checkbox in the "Drawing" section of the view attributes is unchecked, and that the background has an opacity of 0.

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After you select your image in a UIButton in Interface Builder, you need to tell it to use a background with 0 opacity (alpha).