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README.md
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@ -5,13 +5,13 @@
> Compose Multiplatform is in Alpha. It may change incompatibly and require manual migration in the future.
You can use this template to start developing your own [Compose Multiplatform](https://github.com/JetBrains/compose-multiplatform) application.
The result will be a Kotlin Multiplatform project targeting Android and iOS.
The result will be a Kotlin Multiplatform project targeting Android and iOS.
![](readme_images/banner.png)
## Set up an environment
> **Important**. You will need a Mac with macOS to write and run iOS-specific code on simulated or real devices.
> **Important**. 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:
@ -24,7 +24,7 @@ To work with this template, you need the following:
### Check your environment
Before you start, use the [KDoctor](https://github.com/Kotlin/kdoctor) tool to ensure you have all the tools and that your development environment is configured correctly.
When you install all the tools, 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/):
@ -38,26 +38,25 @@ Before you start, use the [KDoctor](https://github.com/Kotlin/kdoctor) tool to e
kdoctor
```
If everything is set up correctly, you'll see a valid output:
If everything is set up correctly, you'll see a valid output:
```text
Environment diagnose (to see all details, use -v option):
[✓] Operation System
[✓] Java
[✓] Android Studio
[✓] Xcode
[✓] Cocoapods
```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!
```
Conclusion:
✓ Your system is ready for Kotlin Multiplatform Mobile Development!
```
Otherwise, KDoctor will highlight which parts of your setup still need configuration and suggest how to fix them.
Otherwise, KDoctor will highlight which parts of your setup still need configuration and suggest how to fix them.
## Examine the project structure
1. Open the project in Android Studio.
2. Switch the project view from **Android** to **Project** to see all the files and targets belonging to the project.
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:
<img src="readme_images/open_project_view.png" height="300px">
@ -68,7 +67,7 @@ Your Compose Multiplatform project includes three modules:
This is a Kotlin module that contains the logic common for both Android and iOS applications, the code you share between platforms.
This `shared` module is also where you write your Compose Multiplatform code.
You can find the shared root `@Composable` function for your app in `shared/src/commonMain/kotlin/App.kt`.
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.
@ -91,10 +90,11 @@ To run your application on an Android emulator:
1. Create an [Android virtual device](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**.
3. Choose your virtual device and click **Run**:
<img src="readme_images/run_on_android.png" height="60px">
<img src="readme_images/android_app_running.png" height="200px">
<img src="readme_images/run_on_android.png" height="60px">
<img src="readme_images/android_app_running.png" height="200px">
<details>
<summary>Alternatively, use Gradle</summary>
@ -105,44 +105,47 @@ To install an Android application on a real device Android device or an emulator
### On iOS
#### Running on an iOS simulator
#### Running on a simulator
Once you have configured your environment correctly,
you can select which iOS simulator to run your application in Android Studio by modifying the `iosApp` run configuration.
To run your application on an iOS simulator in Android Studio, modify the `iosApp` run configuration:
In the list of run configurations, select **Edit Configurations** and navigate to **iOS Application** | **iosApp**.
In the **Execution target** list, select your target device.
1. In the list of run configurations, select **Edit Configurations**:
<img src="readme_images/edit_run_config.png" height="200px">
<img src="readme_images/target_device.png">
<img src="readme_images/edit_run_config.png" height="200px">
Press the **Run** button to run your Compose Multiplatform app on the iOS simulator.
2. Navigate to **iOS Application** | **iosApp**.
3. In the **Execution target** list, select your target device. Click **OK**:
<img src="readme_images/target_device.png">
4. The `iosApp` run configuration is now available. Click **Run** next to your virtual device:
<img src="readme_images/hello_world_ios.png" height="200px">
#### Running on a real iOS device
#### Running on a real device
You can run your Compose Multiplatform application on a real device. To do that, you'll need the following:
You can run your Compose Multiplatform application on a real iOS device.
To do that, you'll need the following:
* `TEAM_ID` associated with your [Apple ID](https://support.apple.com/en-us/HT204316)
* The iOS device registered in Xcode
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 [this Standford CS193P lecture recording](https://youtu.be/bqu6BquVi2M?start=716&end=1399).
<details>
<summary>How to create and run a simple project in Xcode</summary>
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 a device name near the **Run** button.
6. Plug in your device to the computer. You'll see this device in the list of run options.
7. Choose your device and click **Run**.
</details>
> 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 [this Standford CS193P lecture recording](https://youtu.be/bqu6BquVi2M?start=716&end=1399).
>
> <details>
>
> <summary>How to create and run a simple project in Xcode</summary>
>
> 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 a device name near the **Run** button.
> 6. Plug in your device to the computer. You'll see this device in the list of run options.
> 7. Choose your device and click **Run**.
>
> </details>
##### Finding your Team ID
@ -170,7 +173,7 @@ If KDoctor doesn't work for you, try this alternative method:
</details>
To run the application, set the `TEAM_ID` associated with your Apple ID:
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`.
@ -178,66 +181,67 @@ To run the application, set the `TEAM_ID` associated with your Apple ID:
## Make your first changes
In Android Studio, navigate to the `shared/src/commonMain/kotlin/App.kt` file.
It's 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:
1. In Android Studio, navigate to the `shared/src/commonMain/kotlin/App.kt` file.
It's the common entry point for your Compose Multiplatform app.
```kotlin
@OptIn(ExperimentalResourceApi::class)
@Composable
internal 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
)
}
}
}
}
```
Here, you see the code responsible for rendering the "Hello, World!" button and the animated Compose Multiplatform logo:
Update the shared code by adding a text field that will update the name displayed on the button:
```kotlin
@OptIn(ExperimentalResourceApi::class)
@Composable
internal 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
)
}
}
}
}
```
```diff
@OptIn(ExperimentalResourceApi::class)
@Composable
internal 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
)
}
}
}
}
```
2. Update the shared code by adding a text field that will update the name displayed on the button:
You'll see this change reflected on both the Android and iOS apps:
```diff
@OptIn(ExperimentalResourceApi::class)
@Composable
internal 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
)
}
}
}
}
```
<img src="readme_images/text_field_added.png" height="200px">
3. Re-run both `androidApp` and `iosApp` configurations. You'll see this change reflected on both the Android and iOS apps:
<img src="readme_images/text_field_added.png" height="200px">
## How to configure the iOS application
@ -245,7 +249,7 @@ You can further configure the basic properties of your iOS app using this templa
In Android Studio, navigate to the `iosApp/Configuration/Config.xcconfig` configuration file. It contains:
* `APP_NAME`, a target executable and an application bundle name
* `BUNDLE_ID` that [uniquely identifies the app throughout the system](https://developer.apple.com/documentation/bundleresources/information_property_list/cfbundleidentifier#discussion)
* `BUNDLE_ID` that [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 set the desired name.

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