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https://github.com/sebastianaigner/my-bird-app


https://github.com/sebastianaigner/my-bird-app

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README 

        
[![official project](http://jb.gg/badges/official.svg)](https://confluence.jetbrains.com/display/ALL/JetBrains+on+GitHub)

[![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)

# [Compose Multiplatform](https://github.com/JetBrains/compose-multiplatform) mobile application



> **Note**

> Compose Multiplatform for iOS is in Alpha. It may change incompatibly and require manual migration in the future.

> We would appreciate your feedback on it in the public Slack channel [#compose-ios](https://kotlinlang.slack.com/archives/C0346LWVBJ4/p1678888063176359).

> If you have any issues, please report them on [GitHub](https://github.com/JetBrains/compose-multiplatform/issues).



You can use this template to start developing your own [Compose Multiplatform](https://github.com/JetBrains/compose-multiplatform#readme) mobile application targeting Android and iOS.

Follow our tutorial below to get your first Compose Multiplatform app up and running.

The result will be a [Kotlin Multiplatform](https://kotlinlang.org/docs/multiplatform.html) project that uses the Compose Multiplatform UI framework.



![](readme_images/banner.png)



If you want to create an application targeting desktop platforms – Windows, macOS, or Linux –

use the [Compose Multiplatform desktop application template](https://github.com/JetBrains/compose-multiplatform-desktop-template#readme).



## Set up the environment



> **Warning**

> You need a Mac with macOS to write and run iOS-specific code on simulated or real devices.

> This is an Apple requirement.



To work with this template, you need the following:



* A machine running a recent version of macOS

* [Xcode](https://apps.apple.com/us/app/xcode/id497799835)

* [Android Studio](https://developer.android.com/studio)

* The [Kotlin Multiplatform Mobile plugin](https://plugins.jetbrains.com/plugin/14936-kotlin-multiplatform-mobile)

* The [CocoaPods dependency manager](https://kotlinlang.org/docs/native-cocoapods.html)



### Check your environment



Before you start, use the [KDoctor](https://github.com/Kotlin/kdoctor) tool to ensure that your development environment is configured correctly:



1. Install KDoctor with [Homebrew](https://brew.sh/):



    ```text

    brew install kdoctor

    ```



2. Run KDoctor in your terminal:



    ```text

    kdoctor

    ```



   If everything is set up correctly, you'll see valid output:



   ```text

   Environment diagnose (to see all details, use -v option):

   [✓] Operation System

   [✓] Java

   [✓] Android Studio

   [✓] Xcode

   [✓] Cocoapods

   

   Conclusion:

     ✓ Your system is ready for Kotlin Multiplatform Mobile development!

   ```



Otherwise, KDoctor will highlight which parts of your setup still need to be configured and will suggest a way to fix them.



## Examine the project structure



Open the project in Android Studio and switch the view from **Android** to **Project** to see all the files and targets belonging to the project:






Your Compose Multiplatform project includes 3 modules:



### shared



This is a Kotlin module that contains the logic common for both Android and iOS applications, that is, the code you share between platforms.



This `shared` module is also where you’ll write your Compose Multiplatform code.

In `shared/src/commonMain/kotlin/App.kt`, you can find the shared root `@Composable` function for your app.



It uses Gradle as the build system. You can add dependencies and change settings in `shared/build.gradle.kts`.

The `shared` module builds into an Android library and an iOS framework.



### androidApp



This is a Kotlin module that builds into an Android application. It uses Gradle as the build system.

The `androidApp` module depends on and uses the `shared` module as a regular Android library.



### iosApp



This is an Xcode project that builds into an iOS application.

It depends on and uses the `shared` module as a CocoaPods dependency.



## Run your application



### On Android



To run your application on an Android emulator:



1. Ensure you have an Android virtual device available. Otherwise, [create one](https://developer.android.com/studio/run/managing-avds#createavd).

2. In the list of run configurations, select `androidApp`.

3. Choose your virtual device and click **Run**:



   



   



  Alternatively, use Gradle



To install an Android application on a real Android device or an emulator, run `./gradlew installDebug` in the terminal.



### On iOS



#### Running on a simulator



To run your application on an iOS simulator in Android Studio, modify the `iosApp` run configuration:



1. In the list of run configurations, select **Edit Configurations**:



   



2. Navigate to **iOS Application** | **iosApp**.

3. In the **Execution target** list, select your target device. Click **OK**:



   



4. The `iosApp` run configuration is now available. Click **Run** next to your virtual device:






#### Running on a real device



You can run your Compose Multiplatform application on a real iOS device for free.

To do so, you'll need the following:



* The `TEAM_ID` associated with your [Apple ID](https://support.apple.com/en-us/HT204316)

* The iOS device registered in Xcode



> **Note**

> Before you continue, we suggest creating a simple "Hello, world!" project in Xcode to ensure you can successfully run apps on your device.

> You can follow the instructions below or watch this [Stanford CS193P lecture recording](https://youtu.be/bqu6BquVi2M?start=716&end=1399).



How to create and run a simple project in Xcode



1. On the Xcode welcome screen, select **Create a new project in Xcode**.

2. On the **iOS** tab, choose the **App** template. Click **Next**.

3. Specify the product name and keep other settings default. Click **Next**.

4. Select where to store the project on your computer and click **Create**. You'll see an app that displays "Hello, world!" on the device screen.

5. At the top of your Xcode screen, click on the device name near the **Run** button.

6. Plug your device into the computer. You'll see this device in the list of run options.

7. Choose your device and click **Run**.



##### Finding your Team ID



In the terminal, run `kdoctor --team-ids` to find your Team ID.

KDoctor will list all Team IDs currently configured on your system, for example:



```text

3ABC246XYZ (Max Sample)

ZABCW6SXYZ (SampleTech Inc.)

```



Alternative way to find your Team ID



If KDoctor doesn't work for you, try this alternative method:



1. In Android Studio, run the `iosApp` configuration with the selected real device. The build should fail.

2. Go to Xcode and select **Open a project or file**.

3. Navigate to the `iosApp/iosApp.xcworkspace` file of your project.

4. In the left-hand menu, select `iosApp`.

5. Navigate to **Signing & Capabilities**.

6. In the **Team** list, select your team.



If you haven't set up your team yet, use the **Add account** option and follow the steps.



To run the application, set the `TEAM_ID`:



1. In the template, navigate to the `iosApp/Configuration/Config.xcconfig` file.

2. Set your `TEAM_ID`.

3. Re-open the project in Android Studio. It should show the registered iOS device in the `iosApp` run configuration.



## Make your first changes



You can now make some changes in the code and check that they are visible in both the iOS and Android applications at the same time:



1. In Android Studio, navigate to the `shared/src/commonMain/kotlin/App.kt` file.

   This is the common entry point for your Compose Multiplatform app.



   Here, you see the code responsible for rendering the "Hello, World!" button and the animated Compose Multiplatform logo:



   ```kotlin

   @OptIn(ExperimentalResourceApi::class)

   @Composable

   fun App() {

       MaterialTheme {

           var greetingText by remember { mutableStateOf("Hello, World!") }

           var showImage by remember { mutableStateOf(false) }

           Column(Modifier.fillMaxWidth(), horizontalAlignment = Alignment.CenterHorizontally) {

               Button(onClick = {

                   greetingText = "Hello, ${getPlatformName()}"

                   showImage = !showImage

               }) {

                   Text(greetingText)

               }

               AnimatedVisibility(showImage) {

                   Image(

                       painterResource("compose-multiplatform.xml"),

                       null

                   )

               }

           }

       }

   }

   ```



2. Update the shared code by adding a text field that will update the name displayed on the button:



   ```diff

   @OptIn(ExperimentalResourceApi::class)

   @Composable

   fun App() {

       MaterialTheme {

           var greetingText by remember { mutableStateOf("Hello, World!") }

           var showImage by remember { mutableStateOf(false) }

           Column(Modifier.fillMaxWidth(), horizontalAlignment = Alignment.CenterHorizontally) {

               Button(onClick = {

                   greetingText = "Hello, ${getPlatformName()}"

                   showImage = !showImage

               }) {

                   Text(greetingText)

               }

   +           TextField(greetingText, onValueChange = { greetingText = it })

               AnimatedVisibility(showImage) {

                   Image(

                       painterResource("compose-multiplatform.xml"),

                       null

                   )

               }

           }

       }

   }

   ```



3. Re-run both the `androidApp` and `iosApp` configurations. You'll see this change reflected in both the Android and iOS apps:



   



## How to configure the iOS application



To get a better understanding of this template's setup and learn how to configure the basic properties of your iOS app without Xcode,

open the `iosApp/Configuration/Config.xcconfig` file in Android Studio. The configuration file contains:



* `APP_NAME`, a target executable and an application bundle name.

* `BUNDLE_ID`, which [uniquely identifies the app throughout the system](https://developer.apple.com/documentation/bundleresources/information_property_list/cfbundleidentifier#discussion).

* `TEAM_ID`, [a unique identifier generated by Apple that's assigned to your team](https://developer.apple.com/help/account/manage-your-team/locate-your-team-id/#:~:text=A%20Team%20ID%20is%20a,developer%20in%20App%20Store%20Connect).



To configure the `APP_NAME` option, open `Config.xcconfig` in any text editor *before opening* the project in Android Studio, and then set the desired name.



If you need to change this option after you open the project in Android Studio, do the following:



1. Close the project in Android Studio.

2. Run `./cleanup.sh` in your terminal.

3. Change the setting.

4. Open the project in Android Studio again.



To configure advanced settings, use Xcode. After opening the project in Android Studio,

open the `iosApp/iosApp.xcworkspace` file in Xcode and make changes there.



## Next steps



We encourage you to explore Compose Multiplatform further and try out more projects:



* [Learn about other cases for using the Compose Multiplatform UI framework](https://github.com/JetBrains/compose-multiplatform#readme)

* [Create an application targeting Windows, macOS, and Linux with Compose Multiplatform for Desktop](https://github.com/JetBrains/compose-multiplatform-desktop-template#readme)

* [Complete more Compose Multiplatform tutorials](https://github.com/JetBrains/compose-multiplatform/blob/master/tutorials/README.md)

* [Explore some more advanced Compose Multiplatform example projects](https://github.com/JetBrains/compose-multiplatform/blob/master/examples/README.md)