Xcode allows developers to build for multiple architectures (armv6 and armv7), and you can pick what features are required from the device for installation (for

Xcode allows developers to build for multiple architectures (armv6 and armv7), and you can pick what features are required from the device for installation (for example, requiring a camera or microphone). At the OS-version level, you can build applications to take advantage of the latest OS, but also be compatible with earlier versions (that’s how the universal applications for iPad, iPhone, and iPod touch work—their base SDK is 3.2, while their target is set to 3.1.3 or below). Additionally, it’s fairly easy to detect whether or not a certain API is available at runtime.