关于报错 'Could not instantiate class named NSLayoutConstraint
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原因：
你选中了类storyboard或xib界面文件的Use Auto Layout 选项，且Auto Layout特性是iOS 6 新增加的，在之前的 5.0/5.1 Simulator模拟器中不支持。
方法：
去掉Use Auto Layout选项
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