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title: ns run ios
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# ns run ios

### Description

Runs your project on a connected iOS device or in the iOS Simulator, if configured. This is shorthand for prepare, build and deploy. While your app is running, prints the output from the application in the console and watches for changes in your code. Once a change is detected, it synchronizes the change with all selected devices and restarts/refreshes the application.

<% if(isConsole && (isWindows || isLinux)) { %>WARNING: You can run this command only on macOS systems. To view the complete help for this command, run `$ ns help run ios`<% } %>
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<% if(isHtml) { %>> <% } %>IMPORTANT: Before building for iOS device, verify that you have configured a valid pair of certificate and provisioning profile on your macOS system. <% if(isHtml) { %>For more information, see the [Code Signing](https://developer.apple.com/support/code-signing/) and [Maintain Signing Assets](https://help.apple.com/xcode/mac/current/#/dev3a05256b8) sections from the Apple Developer documentation.<% } %>

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When running this command without passing `--release` flag, the HMR (Hot Module Replacement) is enabled by default. In case you want to disable HMR, you can pass `--no-hmr` flag. When `--release` is passed, CLI disables HMR.
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### Commands

Usage | Synopsis
---|---
Run on all connected devices | `$ ns run ios [--release] [--justlaunch] [--env.*]]`
Run on a selected connected device. Will start simulator with specified `Device Identifier`, if not already running. | `$ ns run ios [--device <Device ID>] [--release] [--justlaunch] [--env.*]]`
Start an emulator and run the app inside it | `$ ns run ios --emulator [--release] [--env.*]]`
Start an emulator with specified device name and sdk | `$ ns run ios [--device <Device Name>] [--sdk <sdk>]`
Start an emulator with specified device identifier and sdk | `$ ns run ios [--device <Device Identifier>] [--sdk <sdk>]`

### Options

* `--device` - Specifies a connected device/simulator to start and run the app. `<Device ID>` is the index or `Device Identifier` of the target device as listed by the `$ ns device ios --available-devices` command.
* `--emulator` - If set, runs the app in all available and configured ios simulators. It will start a simulator if none are already running.
* `--sdk` - Specifies the target simulator's sdk.
* `--justlaunch` - If set, does not print the application output in the console.
* `--clean` - If set, forces the complete rebuild of the native application.
* `--no-watch` - If set, changes in your code will not be reflected during the execution of this command.
* `--release` - If set, produces a release build by running webpack in production mode and native build in release mode. Otherwise, produces a debug build.
* `--no-hmr` - Disables Hot Module Replacement (HMR). In this case, when a change in the code is applied, CLI will transfer the modified files and restart the application.
* `--env.*` - Specifies additional flags that the bundler may process. Can be passed multiple times. 
    *   `--env.aot` - creates Ahead-Of-Time build (Angular only).
    *   `--env.uglify` - provides basic obfuscation and smaller app size.
    *   `--env.report` - creates a Webpack report inside a `report` folder in the root folder.
    *   `--env.sourceMap` - creates inline source maps.
    *   `--env.hiddenSourceMap` - creates sources maps in the root folder (useful for Crashlytics usage with bundled app in release).
* `--force` - If set, skips the application compatibility checks and forces `npm i` to ensure all dependencies are installed. Otherwise, the command will check the application compatibility with the current CLI version and could fail requiring `ns migrate`.

### Environment Variables

* `IOS_SIMULATOR_RUN_ARGS` - specifies extra command line arguments to pass to the application when running on the iOS Simulator. E.g. `$ IOS_SIMULATOR_RUN_ARGS=-FIRDebugEnabled ns device run ios`.

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### Prerequisites

Before running the iOS Simulator, verify that your system meets the following requirements.
* You have installed a version of Xcode which is compatible with the ios-sim-portable npm package on which the NativeScript CLI depends. For more information, visit [https://www.npmjs.org/package/ios-sim-portable](https://www.npmjs.org/package/ios-sim-portable).

### Command Limitations

* You can run `$ ns run ios` only on macOS systems.
* You cannot use `--device` and `--emulator` simultaneously.

### Related Commands

Command | Description
----------|----------
[appstore](../../publishing/appstore.html) | Lists applications registered in iTunes Connect.
[appstore upload](../../publishing/appstore-upload.html) | Uploads project to iTunes Connect.
[build android](build-android.html) | Builds the project for Android and produces an APK that you can manually deploy on device or in the native emulator.
[build ios](build-ios.html) | Builds the project for iOS and produces an APP or IPA that you can manually deploy in the iOS Simulator or on device, respectively.
[build](build.html) | Builds the project for the selected target platform and produces an application package that you can manually deploy on device or in the native emulator.
[debug android](debug-android.html) | Debugs your project on a connected Android device or in a native emulator.
[debug ios](debug-ios.html) | Debugs your project on a connected iOS device or in a native emulator.
[debug](debug.html) | Debugs your project on a connected device or in a native emulator.
[deploy](deploy.html) | Builds and deploys the project to a connected physical or virtual device.
[run android](run-android.html) | Runs your project on a connected Android device or in a native Android emulator, if configured.
[run](run.html) | Runs your project on a connected device or in the native emulator for the selected platform.
[test init](test-init.html) | Configures your project for unit testing with a selected framework.
[test android](test-android.html) | Runs the tests in your project on Android devices or native emulators.
[test ios](test-ios.html) | Runs the tests in your project on iOS devices or the iOS Simulator.
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