I am currently implementing multiple scenes in my React Native / Swift application (one scene for the phone and one scene for CarPlay). I am facing an issue where one scene renders completely white (on the iPhone) but I can see in the console that the code is running (for example if I add a console.log to the App.tsx I can see that console log happen in XCode).
There are no errors when building the app in XCode, and testing with the simulator CarPlay appears to render the correct output, but there is no component being rendered on the simulated phone screen (just white).
AppDelegate.swift
import CarPlay
import React
import React_RCTAppDelegate
import ReactAppDependencyProvider
import UIKit
@main
class AppDelegate: RCTAppDelegate {
var rootView: UIView?;
static var shared: AppDelegate { return UIApplication.shared.delegate as! AppDelegate }
override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
self.moduleName = "appName"
self.dependencyProvider = RCTAppDependencyProvider()
self.initialProps = [:]
self.rootView = self.createRootView(
with: RCTBridge(
delegate: self,
launchOptions: launchOptions
),
moduleName: self.moduleName!,
initProps: self.initialProps!
);
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
override func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
if (connectingSceneSession.role == UISceneSession.Role.carTemplateApplication) {
let scene = UISceneConfiguration(name: "CarPlay", sessionRole: connectingSceneSession.role)
scene.delegateClass = CarSceneDelegate.self
return scene
}
let scene = UISceneConfiguration(name: "Phone", sessionRole: connectingSceneSession.role)
scene.delegateClass = PhoneSceneDelegate.self
return scene
}
override func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {}
override func sourceURL(for bridge: RCTBridge) -> URL? {
self.bundleURL()
}
override func bundleURL() -> URL? {
#if DEBUG
RCTBundleURLProvider.sharedSettings().jsBundleURL(forBundleRoot: "index")
#else
Bundle.main.url(forResource: "main", withExtension: "jsbundle")
#endif
}
}
PhoneSceneDelegate.swift
import Foundation
import UIKit
import SwiftUI
class PhoneSceneDelegate: UIResponder, UIWindowSceneDelegate {
var window: UIWindow?;
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
if session.role != .windowApplication {
return
}
guard let appDelegate = (UIApplication.shared.delegate as? AppDelegate) else {
return
}
guard let windowScene = (scene as? UIWindowScene) else {
return
}
let rootViewController = UIViewController()
rootViewController.view = appDelegate.rootView;
let window = UIWindow(windowScene: windowScene)
window.rootViewController = rootViewController
self.window = window
window.makeKeyAndVisible()
}
}
App.tsx
import React, {useEffect, useState} from 'react';
import type {PropsWithChildren} from 'react';
import {CarPlay, ListTemplate} from 'react-native-carplay';
import {
ScrollView,
StatusBar,
StyleSheet,
Text,
useColorScheme,
View,
} from 'react-native';
import {
Colors,
DebugInstructions,
Header,
LearnMoreLinks,
ReloadInstructions,
} from 'react-native/Libraries/NewAppScreen';
type SectionProps = PropsWithChildren<{
title: string;
}>;
function Section({children, title}: SectionProps): React.JSX.Element {
const isDarkMode = useColorScheme() === 'dark';
return (
<View style={styles.sectionContainer}>
<Text
style={[
styles.sectionTitle,
{
color: isDarkMode ? Colors.white : Colors.black,
},
]}>
{title}
</Text>
<Text
style={[
styles.sectionDescription,
{
color: isDarkMode ? Colors.light : Colors.dark,
},
]}>
{children}
</Text>
</View>
);
}
function App(): any { // React.JSX.Element
const isDarkMode = useColorScheme() === 'dark';
const backgroundStyle = {
backgroundColor: isDarkMode ? Colors.darker : Colors.lighter,
};
const [carPlayConnected, setCarPlayConnected] = useState(CarPlay.connected);
useEffect(() => {
function onConnect() {
setCarPlayConnected(true);
CarPlay.setRootTemplate(new ListTemplate(/** This renders fine on the CarPlay side */));
}
function onDisconnect() {
setCarPlayConnected(false);
}
CarPlay.registerOnConnect(onConnect);
CarPlay.registerOnDisconnect(onDisconnect);
return () => {
CarPlay.unregisterOnConnect(onConnect);
CarPlay.unregisterOnDisconnect(onDisconnect);
};
});
if (carPlayConnected) {
console.log('car play connected');
} else {
console.log('car play not connected');
}
const safePadding = '5%';
// This doesn't render on the phone?
return (
<View style={backgroundStyle}>
<StatusBar
barStyle={isDarkMode ? 'light-content' : 'dark-content'}
backgroundColor={backgroundStyle.backgroundColor}
/>
<ScrollView
style={backgroundStyle}>
<View style={{paddingRight: safePadding}}>
<Header/>
</View>
<View
style={{
backgroundColor: isDarkMode ? Colors.black : Colors.white,
paddingHorizontal: safePadding,
paddingBottom: safePadding,
}}>
<Section title="Step One">
Edit <Text style={styles.highlight}>App.tsx</Text> to change this
screen and then come back to see your edits.
</Section>
<Section title="See Your Changes">
<ReloadInstructions />
</Section>
<Section title="Debug">
<DebugInstructions />
</Section>
<Section title="Learn More">
Read the docs to discover what to do next:
</Section>
<LearnMoreLinks />
</View>
</ScrollView>
</View>
);
}
const styles = StyleSheet.create({
sectionContainer: {
marginTop: 32,
paddingHorizontal: 24,
},
sectionTitle: {
fontSize: 24,
fontWeight: '600',
},
sectionDescription: {
marginTop: 8,
fontSize: 18,
fontWeight: '400',
},
highlight: {
fontWeight: '700',
},
});
export default App;
I have been attempting to get this working now for some 20+ hours with no luck with searching for answers elsewhere. I am very new to building apps with React Native and Swift so could do with some support.
