如果使用Xcode 4.5來新建項目，默認是支持AutoLayout的，但是AutoLayout是iOS 6的新特性，如果在iOS 5的simulator上運行程序，會出現Could not instantiate class named NSLayoutConstraint問題。解決方法是打開storyboard文件，去掉AutoLayout的選擇。
rob mayoff的神圖一目了然。
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