How can I use swift in Terminal?

Question

I read What\'s new in Xcode 6. The article introduces some new feature about Xcode 6, and it says:

Command Line

Xcode’s debugger includes an inter

Answer 1

Step 1: Open Terminal
Step 2: Type "swift"
Step 3: There's no step 3

Example:

GoldCoast:~ macmark$ swift
Welcome to Swift!  Type :help for assistance.
  1> println("Hello, world")
Hello, world
  2> var myVariable = 42
myVariable: Int = 42
  3> myVariable = 50
  4> let myConstant = 42
myConstant: Int = 42
  5> println(myVariable)
50
  6> let label = "The width is "
label: String = "The width is "
  7> let width = 94
width: Int = 94
  8> let widthLabel = label + String(width)
widthLabel: String = "The width is 94"
  9> :exit

GoldCoast:~ macmark$ 

Answer 2

In the same fashion as running Swift from the Terminal, you can also execute scripts. Just use the following shebang, and run your script. (As per Chris Lattner, creator of Swift)

#!/usr/bin/env xcrun swift -i

Answer 3

make sure you install xcode 6.0 ,but not 6.1

If you get an error:

<unknown>:0: error: the SDK 'MacOSX10.9.sdk' does not support Swift

just run

xcrun --sdk iphonesimulator8.0 swift

or you can

export SDKROOT="iphonesimulator8.0" 

and then

xcrun swift

Use "xcodebuild -showsdks" to list the available SDK names.

if you install xcode 6.1,just

sudo xcode-select -s /Applications/*your-Xcode-6.1-path.app*/Contents/Developer
xcrun swift

Answer 4

Alternatively, if you don't want to mess up your current dev environment, you can just run:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift

Answer 5

If any one cares a simple Swift script shebang:

#!/usr/bin/env xcrun --sdk macosx swift

---

If specific target version is required

#!/usr/bin/env xcrun --sdk macosx swift -target x86_64-macosx10.11

---

If specific toolchain is required (like you want to use Swift 2.3 but you are using Xcode 8)

#!/usr/bin/env xcrun --toolchain com.apple.dt.toolchain.Swift_2_3 --sdk macosx swift -target x86_64-macosx10.11

---

If you want to use Swift 2.2 in your Xcode 7.3.1, let's assume Xcode 7.3.1 is located at /Applications/Xcode7.app

sudo xcode-select -s /Applications/Xcode7.app/
xcrun --sdk macosx swift

from now on the default active developer directory changed, you can check that using:

xcode-select -p

---

If you want to use snapshots provided by Swift.org, you should not miss Installation here.

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as first answered by me in Run swift script from Xcode iOS project as build phase

Answer 6

With the help of Swift REPL(Read Eval Print Loop).

Developers familiar with interpreted languages will feel comfortable in this command-line environment, and even experienced developers will find a few unique features

Launch Terminal.app and type swift and press enter. You’ll then be in the Swift REPL.

        1> print("Hello Swift REPL")
     Hello Swift REPL
        2> 10 + 20
     $R0: Int = 30
        3> var name = "Yogendra Singh"
     name: String = "Yogendra Singh"
        4> print(name)
     Yogendra Singh
        5>