UITabBarItem images just appear as a grey block

问题:

I have created .png icons 20 x 20 and when I set the image property in the nib they just appear grey blocks.

Any ideas?

UPDATE: Here is one of the icons!

回答1:

The standard tabbar icons in iOS are rendered solely from the alpha channel. Colors are ignored completely. Instead of colors you can use different alpha values that lead to a different shade of gray (or blue if selected)

Make the background of your icons transparent.

回答2:

Download these attached images and pass them to your designer and ask him to just create images like these (when you open them in PS you'll know the difference)

回答3:

This happened to me in iOS 5, I got around it by setting UIImage Outlet property in the Xib to 'Custom' and then set the label programmtically so : imageOne = [UIImage imageNames@"Dog.png"];

回答4:

Try saving the file as png interlaced. In photoshop at least it gives you an option of interlaced or normal.