修改/etc/hosts
140.82.114.3 github.com
185.199.108.133 raw.githubusercontent.com
185.199.108.154 github.githubassets.com
185.199.108.133 avatars1.githubusercontent.com
185.199.108.133 avatars2.githubusercontent.com
185.199.108.133 avatars3.githubusercontent.com
185.199.108.133 avatars4.githubusercontent.com
查询相应的地址添加进去
注意用sudo来修改比较方便
最后
open -a Xcode.app