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Can I run Swift REPL with iOS SDK?

I want to import and use UIKit in REPL, but no success.

$ xcrun --sdk iphonesimulator8.1 --show-sdk-path
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator8.1.sdk

$ xcrun --sdk iphonesimulator8.1 swift
Welcome to Swift!  Type :help for assistance.
  1> import UIKit
/var/folders/kb/xgglxb597sv6h8b744d5vft00000gn/T/lldb/92014/repl1.swift:2:8: error: no such module 'UIKit'
import UIKit
       ^

$ swift -sdk `xcrun --sdk iphonesimulator8.1 --show-sdk-path`
Welcome to Swift!  Type :help for assistance.
  1> import UIKit
/var/folders/kb/xgglxb597sv6h8b744d5vft00000gn/T/lldb/91881/repl1.swift:2:8: error: no such module 'UIKit'
import UIKit
       ^

  1> import Cocoa
  2>

I'm using Xcode Version 6.1 (6A1052d)

rintaro
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2 Answers2

8

You may achieve it by running repl from lldb, which attached to iOS application process (of your Xcode project).

  1. Build project in Xcode, or:

    $ xcrun xcodebuild -configuration Debug -destination 'platform=iOS Simulator,name=iPhone 7,OS=10.3' clean build

  2. Start standalone lldb for your iOS project:

    $ xcrun lldb -- $DerivedData/$AppName/Build/Products/Debug-iphonesimulator/$AppName.app
(lldb) process attach --name '$AppName' --waitfor

    You may find useful platform select ios-simulator and platform connect $UDID commands here.

  3. Run your iOS application in iOS simulator from Xcode

    • Or from command line:

      1. Boot simulator

        • From instruments:

          $ xcrun instruments -w "`xcrun instruments -s | grep 'iPhone 7 (10.3)' | head -1`"

        • Or as an application:

          $ open -a "Simulator" --args -CurrentDeviceUDID "`xcrun instruments -s | grep 'iPhone 7 (10.3)' | head -1 | sed -E -e 's/[^][]*\[([^][]*)\][^][]*/\1/g'`"

      2. Install the application on simulator, and launch it:

        $ xcrun simctl install booted $DerivedData/$AppName/Build/Products/Debug-iphonesimulator/$AppName.app
$ xcrun simctl launch booted $AppBundleID

        Also, you can even use xcrun simctl launch --wait-for-debugger and start lldb later.

    • Or with ios-sim:

      1. Optionally boot simulator & install the application:

        $ ios-sim start --devicetypeid 'iPhone-7, 10.3'
$ ios-sim install --devicetypeid 'iPhone-7, 10.3' $DerivedData/$AppName/Build/Products/Debug-iphonesimulator/$AppName.app

      2. Launch it:

        $ ios-sim launch --devicetypeid 'iPhone-7, 10.3' $DerivedData/$AppName/Build/Products/Debug-iphonesimulator/$AppName.app

  4. Attach to process in iOS simulator in lldb:

    (lldb) continue
(lldb) process interrupt

  5. Run swift repl.

    (lldb) repl
 1> import UIKit
 2>

Furthermore, as opposed to swift repl in Xcode debug terminal emulator, here we have working source autocompletion and command history navigation.

Netsu
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4

The Swift REPL currently does not support iOS device or iOS simulator.

Greg Parker
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