Missing iOS Distribution signing identity

2016年2月14日之后上传App Store会遭遇一次 Missing iOS Distribution signing identity ...问题。

摘自 Apple －

This issue occurs when the expired WWDR Intermediate certificate is present in both the System keychain and Login keychain within the Keychain Access application. To resolve the issue, first download and install the renewed certificate. Next, in the Keychain Access application, select the System keychain. Select ‘Show Expired Certificates’ in the View menu and then delete the expired version of the Apple Worldwide Developer Relations Certificate Authority Intermediate certificate. Your certificates should now appear as valid in Keychain Access and be available to Xcode. This issue is resolved in OS X El Capitan v10.11.4 beta.

所以我们的解决步骤是这样的

安装新的证书

下载新的证书 WWDR Intermediate certificate, 并 双击 打开。
这时，Keychain Access 程序会启动。

删除旧的证书

在Keychain Access的菜单栏 点击”View”选择 “Show Expired Certificates”
在“Login”和“System”下，找到名为 “Apple Worldwide Developer Relations Certificate Authority Intermediate certificate”的过期证书，并删除。

现在你就可以上传应用到App Store了。