XCode warning：“View Controller” is unreachable because it has no entry points
Unsupported Configuration: “View Controller” is unreachable because it has no entry points, and no identifier for runtime access via -[UIStoryboard instantiateViewControllerWithIdentifier:].
直译：不支持的设置："View Controller"是不能被取到的，因为它没有程序入口指针，也没有标识符以供方法[UIStoryboard instantiateViewControllerWithIdentifier:]在运行时获取。
分析：相当于你创了一个UIViewController却什么都没设置。
解决方案：干掉，或者起个标识符并使用。
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