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:].
直譯：不支持的設置："View Controller"是不能被取到的，因為它沒有程序入口指針，也沒有標識符以供方法[UIStoryboard instantiateViewControllerWithIdentifier:]在運行時獲取。
分析：相當於你創了一個UIViewController卻什麽都沒設置。
解決方案：幹掉，或者起個標識符並使用。
XCode warning：“View Controller” is unreachable because it has no entry points
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