- The iPhone runs Apple’s iOS operating system. Before you can get started creating an app for the iPhone, you need to register as an Apple Developer. Registered developers download Apple’s Xcode, which includes the iOS Software Development Kit and other tools to create apps that run on the iPhone under iOS. Xcode only runs on Macs. You can use any graphics program to generate the icons for your iPhone app.
- Apple requires you to create an application icon for your app. This icon is the image that appears on the device’s home screen, and which the user taps to launch the app. The iPhone app icon size must measure 57 pixels by 57 pixels, or 114 pixels by 114 pixels for high resolution.
- When people browse and search for apps in Apple’s online App Store, images of icons appear with the search results. Apple requires developers to create a version of their iPhone app icon measuring 512 pixels by 512 pixels. This icon shows up when people shop for apps using the free iTunes application, as well as when people use a Web browser to visit the App Store.
- People search for items on their iPhone using Spotlight, and apps appear with a small version of their icon in the search results. You swipe a finger from left to right across the device’s home screen to access Spotlight, causing the iPhone’s virtual keyboard to appear so you can type a search term. Apple’s guidelines require app developers to make a Spotlight search icon for their app that measures 29 pixels by 29 pixels, or 58 pixels by 58 pixels for high resolution.
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