How I can tell the iOS SDK version used by my Xcode? and iOS SDK version installed on my Mac?
Xcode 的 SDK 版本可以在项目的 Build Settings 中看到:
要找出安装了哪些 iOS SDK,请打开终端并键入
ls -lah /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs
(根据Apple,这是它们的安装位置)