現象：The identity used to sign the executable is no longer validPlease verify that your device’s clock is properly set, and that your signing certificat...
現象：The identity used to sign the executable is no longer valid
Please verify that your device’s clock is properly set, and that your signing certificate is not expired.
your signing certificate is not expired.就是你的證書無效了，去“鑰匙訪問串”里把無效的證書刪除後，重新安裝一個有效的就可以了。
也就是：進入鑰匙串管理 把相關的證書刪掉，然後在回到Xcode 選完 identity - Team 後選fix。
可能會出現：
點擊Reset即可。
