Missing ios distribution signing identity xcode can request one for you

这几天苹果企业证期快要到期了，打包应用的时候总是提示证书错误如下：

Missing ios distribution signing identity xcode can request one for you

搞了半天终于在网上找到一个简单靠谱的解决方案：

From Apple -

Thanks for bringing this to the attention of the community and apologies for the issues you’ve been having. This issue stems from having a copy of the expired WWDR Intermediate certificate in both your System and Login keychains. To resolve the issue, you should first download and install the new WWDR intermediate certificate (by double-clicking on the file). Next, in the Keychain Access application, select the System keychain. Make sure to select “Show Expired Certificates” in the View menu and then delete the expired version of the Apple Worldwide Developer Relations Certificate Authority Intermediate certificate (expired on February 14, 2016). Your certificates should now appear as valid in Keychain Access and be available to Xcode for submissions to the App Store.

注意加粗的地方。