如果使用Xcode 4.5来新建项目，默认是支持AutoLayout的，但是AutoLayout是iOS 6的新特性，如果在iOS 5的simulator上运行程序，会出现Could not instantiate class named NSLayoutConstraint问题。解决方法是打开storyboard文件，去掉AutoLayout的选择。
rob mayoff的神图一目了然。
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