xcode - iPhone icon size

Question

I am developing an application for iPhone to support multiple devices, iPhone 2-4. I had an issue with the app icon as it was shown pixelated in the iPhone 4 simulator so I have used a new image with higher resolution (300 x 300) to be precise. On the simulator its showing fine for both iPhone 4 and the iPhone device simulators. However, when I ported my app to an iPhone 3 actual device the icon did not show at all and instead I get a blank white icon. I don't have an iPhone 4 yet so I cant tell if the same issue will happen on the physical device.

I am not sure what is the best dimensions/dpi to use for an icon to display perfectly on an iPhone 4 and older devices? Would appreciate a help if possible..

Answer 1

For older devices, save your 57x57 icon as Icon.png. For the iPhone 4, save your 114x114 icon as Icon@2x.png. The image resolution doesn't matter at all; only the pixel dimensions matter.

There are other sizes to cater to, like Spotlight/Settings icons and iPad icons. There's a full list written up in the library documentation.