When you're writing an app for iOS, you likely test on the simulator and one or two devices. You might even test on more than one or two versions of iOS. But doing so would cover only a handful of the different combinations of iOS version and device type. The amount of combinations add up quick! In this tutorial you'll see how to use various techniques that allow you to support different iOS versions and devices effectively. You'll have your apps supporting multiple iOS versions and devices in no time. In this tutorial, you'll modify an existing iOS 6 app called RWRageFaces to make it compatible for iOS 5 – without losing any of the iOS 6 functionality. Along the way, you'll cover various methods to detect and correct compatibility issues – and you'll encounter a whole lot of crashes that give you some insight into the various APIs that we take for granted in iOS 6.


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