Download the latest version of Xcode from the Apple developer website or get it using the Mac App Store. Once you have Xcode installed, open a terminal, run xcode-select --install, and click the Install button to install the required command line developer tools. Don’t worry if you see a m ...

下载的ios_development.cer 文件添加不到钥匙串

双击提示  ：
不能修改“System Roots”钥匙串
要更改根证书是否会被信任，请在“钥匙串访问”中打开它，然后修改它的信任设置。