如何安装iphoneOS10.0.sdk及iphoneSimulator10.0.sdk

iphoneOS SDKs包含在xcode里，如果想要下载旧版本的iphoneOS SDKs，你需要下载xcode from https://developer.apple.com/download/more/.
xcode的版本号和xcode使用的SDKs版本号相差2，即：
iOS 8.4 from Xcode 6.4
iOS 9.3 from Xcode 7.3.1
iOS 10.2 from Xcode 8.2.1
iOS 10.3 from Xcode 8.3.2
iOS 11.0 from Xcode 9.0.1
iOS 11.1 from Xcode 9.1

to install

# tar.gz
sudo tar -C /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/ -xvf iPhoneOS9.3.sdk.tar.gz  

# zip
sudo unzip -d /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/  iPhoneOS10.3.sdk.zip  

翻译自：https://sskaje.me/ios-sdk-archive/
这里有各版本的iphoneOS SDKs https://github.com/okanon/iPhoneOS.sdk