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下载 Xcode 7.0 并迁移到 Swift 2.0 后，我收到以下错误。
尝试将此 NSLayoutConstraint 添加到它已经存在的引擎中。这可能会导致引擎损坏。中断 void _NSLayoutConstraintRedundantAdd() 进行调试。这将只记录一次。这可能会在未来打破。
似乎对于少数人来说，它通过更新到 Xcode 7 beta 5 得到了修复
https://forums.developer.apple.com/thread/11909