Xcode 4.2 adds support for many facial appearance that are available in iOS 5.0.
• The LLVM compiler supports Automatic Reference Counting (ARC), and Xcode includes a menu item to convert targets to use ARC
• The Interface Builder user interface provides support for creating storyboard files for your iOS applications
• In iOS Simulator, you can now simulate different locations for applications using the Core Location framework.
• You can download your application data from an iOS device and automatically bring back that data when debugging or testing in iOS simulator or on a device.
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