安装Xcode6测试版后,做
$ sudo xcode-select -s /Applications/Xcode6-Beta.app/Contents/Developer/
$ xcrun swift
是Swift REPL
编辑:
对于XCode 6,请使用:
xcrun swift -sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhonesimulator.platform/Developer/SDKs/iPhonesimulator.sdk