# Screen sharing (/en/realtime-media/interactive-live-streaming/build/manage-video-and-streaming/screen-sharing/react-native) > For AI agents: see the complete documentation index at [llms.txt](/llms.txt). During Interactive Live Streaming sessions, hosts use the screen sharing feature in the Agora Video SDK to share their screen content with other users or viewers in the form of a video stream. Screen sharing is typically used in the following use-cases: | Use-case | Description | | :------------------------- | :------------------------------------------------------------------------------------------------------------- | | Online education | Teachers share their slides, software, or other teaching materials with students for classroom demonstrations. | | Game live broadcast | Hosts share their game footage with the audience. | | Interactive live broadcast | Anchors share their screens and interact with the audience. | | Video conferencing | Meeting participants share the screen to show a presentation or documents. | | Remote control | A controlled terminal displays its desktop on the master terminal. | Agora screen sharing offers the following advantages: * **Ultra HD quality experience**: Supports Ultra HD video (4K resolution, 60 FPS frame rate), giving users a smoother, high-definition, ultimate picture experience. * **Multi-app support**: Compatible with many mainstream apps such as WPS Office, Microsoft Office Power Point, Visual Studio Code, Adobe Photoshop, Windows Media Player, and Scratch. This makes it convenient for users to directly share specific apps. * **Multi-device support**: Supports multiple devices sharing at the same time. Screen sharing is compatible with Windows 8 systems, devices without independent graphics cards, dual graphics card devices, and external screen devices. * **Multi-platform adaptation**: Supports iOS, Android, macOS, Windows, Web, Unity, Flutter, React Native, Unreal Engine, and other platforms. * **High security**: Supports sharing only a single app or part of the screen. Also supports blocking specified app windows, effectively ensuring user information security. This page shows you how to implement screen sharing in your app. ## Understand the tech [#understand-the-tech-7] The screen sharing feature provides the following screen sharing modes for use in various use-cases: **Screen sharing use-cases** ![Screen Sharing Functionality](https://assets-docs.agora.io/images/video-sdk/screen-sharing-functionality.png) * **Share the entire screen**: Share your entire screen, including all the information on the screen. This feature supports collecting and sharing information from two screens at the same time. * **Share an app window**: If you don't want to share the entire screen with other users, you can share only the area within an app window. * **Share a designated screen area**: If you only want to share a portion of the screen or app window, you can set a sharing area when starting screen sharing. Screen sharing modes are available on different platforms as follows: * **Desktop** (Windows and macOS): Supports all screen sharing features listed above. * **Mobile** (Android and iOS): Only supports sharing the entire screen. ## Prerequisites [#prerequisites-7] * Ensure that you have implemented the [SDK quickstart](../../index.mdx) in your project. ## Set up your project [#set-up-your-project-7] ### Set up iOS screen sharing [#set-up-ios-screen-sharing] Since Apple does not support capturing the screen in the main process of the app, you create a separate extension for the screen sharing stream. You use the iOS native `ReplayKit` framework in the extension to record the screen, and then send the screen sharing stream to the main process. ![Screen Sharing React Native Tech](https://assets-docs.agora.io/images/video-sdk/screen-sharing-flutter-unity-rn-blueprint.svg) ## Implement screen sharing [#implement-screen-sharing-7] This section introduces how to implement screen sharing in your project. Android iOS When enabling screen sharing on Android, you only need to call the `startScreenCapture` method. Refer to the [screen sharing sample project](https://github.com/AgoraIO-Extensions/react-native-agora/blob/main/example/src/examples/advanced/ScreenShare/ScreenShare.tsx) to implement screen sharing. Since Apple does not support capturing the screen in the main process of the app, you create a separate extension for the screen sharing stream. You use the iOS native `ReplayKit` framework in the extension to record the screen, and then send the screen sharing stream to the main process. **Screen sharing React Native tech** ![Screen Sharing React Native Tech](https://assets-docs.agora.io/images/video-sdk/screen-sharing-flutter-unity-rn-blueprint.svg) Take the following steps to set up your screen sharing project: 1. Go to your project folder and open the `ios/.xcodeproj` file with Xcode. 2. Create a **Broadcast Upload Extension** to enable the process of screen sharing: 3. Navigate to **File > New > Target...**, select **Broadcast Upload Extension** in the popup window, and then click **Next**: ![Select Broadcast Upload Extension](https://assets-docs.agora.io/images/video-sdk/screen-sharing-ios-select-broadcast-upload-extension.png) 4. Fill in the **Product Name** and other information in the popup window, uncheck **Include UI Extension**, and click **Finish**. Xcode automatically creates a folder for the extension that contains the `SampleHandler.h` files. 5. Under **Target**, select the newly created extension. Click **General** and set the iOS version to 12.0 or later under **Deployment Info**. 6. Modify project settings to implement the screen sharing code logic, and choose one of the following methods according to your business needs: * To use the functionality in the `AgoraReplayKitExtension.xcframework` dynamic library provided by Agora, select **Target** as the extension you just created, and change the **Value** in **Info** corresponding to **NSExtension > NSExtensionPrincipalClass** from **$(PRODUCT\_MODULE\_NAME}.SampleHandler** to **AgoraReplayKitHandler**: ![Use AgoraReplayKitHandler](https://assets-docs.agora.io/images/video-sdk/screen-sharing-ios-use-agorareplaykithandler.png) * To implement additional business logic, refer to the following code to modify the `SampleHandler.h` file: ```objc #import "SampleHandler.h" #import "AgoraReplayKitExt.h" #import @interface SampleHandler () @end @implementation SampleHandler - (void)broadcastStartedWithSetupInfo:(NSDictionary *)setupInfo { // User request to start broadcasting [[AgoraReplayKitExt shareInstance] start:self]; } - (void)broadcastPaused { // User requests to pause the broadcast, screen sharing is paused NSLog(@"broadcastPaused"); [[AgoraReplayKitExt shareInstance] pause]; } - (void)broadcastResumed { // User requests to resume broadcasting, screen sharing is resumed NSLog(@"broadcastResumed"); [[AgoraReplayKitExt shareInstance] resume]; } - (void)broadcastFinished { // User requests to stop broadcasting NSLog(@"broadcastFinished"); [[AgoraReplayKitExt shareInstance] stop]; } - (void)processSampleBuffer:(CMSampleBufferRef)sampleBuffer withType:(RPSampleBufferType)sampleBufferType { [[AgoraReplayKitExt shareInstance] pushSampleBuffer:sampleBuffer withType:sampleBufferType]; } #pragma mark - AgoraReplayKitExtDelegate - (void)broadcastFinished:(AgoraReplayKitExt *_Nonnull)broadcast reason:(AgoraReplayKitExtReason)reason { switch (reason) { case AgoraReplayKitExtReasonInitiativeStop: { NSLog(@"AgoraReplayKitExtReasonInitiativeStop"); } break; case AgoraReplayKitExtReasonConnectFail: { NSLog(@"AgoraReplayKitExReasonConnectFail"); } break; case AgoraReplayKitExtReasonDisconnect: { NSLog(@"AgoraReplayKitExReasonDisconnect"); } break; default: break; } } @end ``` 7. Combine the call to `startScreenCapture` with the user's action to enable screen sharing in your app. To do this, use one of the following methods: * Use Apple's new [RPSystemBroadcastPickerView](https://developer.apple.com/documentation/replaykit/rpsystembroadcastpickerview) in iOS 12.0 to make the **Enable Screen Sharing** button pop up on the app interface, prompting the user to click the button to start recording. This is the default method for React Native SDK, but `RPSystemBroadcastPickerView` has some usage restrictions and may not work in later versions of iOS. If it fails, use the following method instead. * Prompt the user to long click the **screen recording** button in the **Control Center** on iOS and choose to use the extension you created to start recording. #### Development notes [#development-notes] * If you use **Cocoapods**, add the following content to the `Podfile` file to add a dependency for your screen sharing extension. Replace `ScreenSharing` with the target name of your screen sharing extension: ```ruby target 'ScreenSharing' do # Change the version to match the SDK dependency in the node_modules/react-native-agora/react-native-agora.podspec file pod 'AgoraRtcEngine_iOS', 'version' end ``` * The memory usage of **Broadcast Upload Extension** is limited to 50 MB. Make sure that the memory usage of **Screen Sharing Extension** does not exceed 50 MB. ### Limitations [#limitations-7] Be aware of the following limitations: #### Limitations on iOS [#limitations-on-ios] * Due to system limitations, screen sharing is only supported on iOS 12.0 and above. * This feature requires a high level of device performance. Agora recommends that you use an iPhone X or above. * The video unit price for a screen-sharing stream is based on the **video resolution** you set in `ScreenCaptureParameters`. If you do not pass dimensions in `ScreenCaptureParameters`, Agora bills you at the default resolution of 1920 x 1080 (2,073,600). See [Pricing](../../reference/pricing.md) for details. ## Reference [#reference-7] This section contains content that completes the information on this page, or points you to documentation that explains other aspects to this product. ### Sample project [#sample-project-7] Agora provides open source sample projects on GitHub for your reference: * [React Native Screen Sharing Examples](https://github.com/AgoraIO-Extensions/react-native-agora): Agora screen sharing examples. * [ScreenShare](https://github.com/AgoraIO-Extensions/react-native-agora/blob/main/example/src/examples/advanced/ScreenShare/ScreenShare.tsx): Example project implements the screen sharing process. ### API reference [#api-reference-6] * [`startScreenCapture`](https://api-ref.agora.io/en/video-sdk/react-native/4.x/API/class_irtcengine.html#api_irtcengine_startscreencapture) * [`stopScreenCapture`](https://api-ref.agora.io/en/video-sdk/react-native/4.x/API/class_irtcengine.html#api_irtcengine_stopscreencapture) * [`updateScreenCapture`](https://api-ref.agora.io/en/video-sdk/react-native/4.x/API/class_irtcengine.html#api_irtcengine_updatescreencapture)