Xcode真机调试失败：The identity used to sign the executable is no longer valid

The identity used to sign the executable is no longer valid.

Please verify that your device's clock is proprtly set,and that your signing certificate is not expired.(0xE8008018).

其实这个问题很简单，Xcode是告诉你的身份认证已经失效了，需要你重新进行签名认证。解决方案也很简单：

选择Xcode->Preferences->Accounts,旁边应该就有一个红色的感叹号。Xcode提示你需要重新输入Apple ID和密码，你重新输入验证即可。然后就可以真机调试了。

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