2016年2月14日以后打包上传AppStore会发现出现如下的问题：
错误截图
导致问题的原因是：
下边这个证书过期了
以下是苹果官方给出的回应：
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 newWWDR 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.
解决办法：
1，打开钥匙串
2，显示所有已过期的证书
3，在‘登陆’和‘系统’中删除已过期的Apple Worldwide Developer Relations Certification Authority证书（‘系统’需要解除权限才能删除）
4，下载新的Apple Worldwide Developer Relations Certification Authority证书，双击安装
这时你的开发、发布等证书就正常了
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