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If I use a png file with transparent background as the app icon in iOS4, the compiler will change its background to black. How can I preserve its transparency?
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Select the picture for which you want to change the transparency. Select the Picture Format tab, and then select Transparency .
Click on the color box at the right of the text field under “Background color”. Select a color and move the arrow on the opacity bar with the checkered design to adjust transparency. Scroll it all the way to the left to make it completely transparent. Moving the opacity bar is always an option.
Transparent application icons are not allowed. The iOS Human Interface Guidelines makes it clear that alpha transparency is not allowed and elaborates:
Give your application icon a discernible background. Icons with visible backgrounds look best on the Home screen primarily because of the rounded corners iOS adds. This is because uniformly rounded corners ensure that all the icons on a user's Home screen have a consistent appearance that invites tapping. If you create an icon with a background that disappears when it's viewed on the Home screen, users don't see the rounded corners. Such icons often don't look tappable and tend to interfere with the orderly symmetry of the Home screen that users appreciate.
Be sure your image completely fills the required area. If your image boundaries are smaller than the recommended sizes, or you use transparency to create “see-through” areas within them, your icon can appear to float on a black background with rounded corners.
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I think it is impossible.
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