The identity used to sign the executable is no longer valid.

Xcode 7.2真机运行出现的问题：

The identity used to sign the executable is no longer valid.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

(0xE8008018)

解决办法：

先把xcodel -> preference -> profile文件删了
去钥匙串把Iphone证书删了
再到1上重新download profile就行了