iOS OC查看源码,OC转C++

xcrun -sdk iphoneos clang -arch arm64 -rewrite-objc main.m

no developer tools were found at '/Applications/Xcode.app', requesting install. Choose an option in the dialog to download the command line developer tools.
no developer tools were found at '/Applications/Xcode.app', requesting install. Choose an option in the dialog to download the command line developer tools.

需要下载command line developer tools

下载后重新执行命令就出来了

 clang -rewrite-objc main.m