iOS各个版本升级时API的差分(API Diffs)

伴随着iOS的每次升级，都有不少API更新，程序可能也需要相应的修改。

面对麻烦，只有快速地解决麻烦：

iOS 5 Beta 2 API Diffs （非官方）

iOS 4.2 to iOS 4.3 API Differences

iOS 4.1 to iOS 4.2 API Differences

iOS 4.0 to iOS 4.1 API Differences

iOS 3.2 to iOS 4.0 API Differences

iOS 3.1 to iOS 3.2 API Differences

iOS 3.0 to iOS 3.1 API Differences

iOS 2.2 to iOS 3.0 API Differences

iOS 2.1 to iOS 2.2 API Differences

iOS 2.0 to 2.1 API Changes