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已关闭8年。
我的iPhone 4和iOS 4.3.2没有越狱。
我想将iOS升级到5.x版本。如果要这样做，那么我可以编写适用于iOS 4.3的应用程序吗？我的意思是，它们将在iOS 5.x上与iOS 4.3一样工作吗？ iOS 4.x API和5.x之间有哪些主要区别？