官方下载dmg 和xip
链接https://developer.apple.com/download/more/ (需要Apple ID 登陆).
必须先登录才能有权限下载
*(Newest on top. For each minor version (6.3, 5.1, etc.) only the latest revision is kept in the list.)
Xcode 10
Xcode 9
Xcode 8
Xcode 7
Xcode 6
Even Older Versions (unsupported for iTunes Connect)
Older Betas
所有链接和beta 版都在 xcodereleases.com