Linking.getInitialURL in standalone in iOS fails to pass additional data in the URL

When using Linking.getInitialURL to retrieve the URL (in a standalone iOS app with a custom scheme) when the app is first loaded (not when foregrounded), only the prefix is returned.

For example, attempting to open the app using custom scheme test with test://something, the URL retrieved with Linking.getInitialURL will return only the prefix test://.

Environment

Environment: OS: macOS High Sierra 10.13.4 Node: 8.9.0 Yarn: 0.22.0 npm: 5.8.0 Watchman: 4.9.0 Xcode: Xcode 9.3 Build version 9E145 Android Studio: 3.1 AI-173.4670197

Packages: (wanted => installed) expo: ^26.0.0 => 26.0.0 react: 16.3.0-alpha.1 => 16.3.0-alpha.1 react-native: https://github.com/expo/react-native/archive/sdk-26.0.0.tar.gz => 0.54.2

Diagnostics report: https://exp-xde-diagnostics.s3.amazonaws.com/gradealabs-903bc80d-7584-4adb-b9cc-a451803284e8.tar.gz

Steps to Reproduce

In order to make this as easy as possible, I’ve written a bash script to create a test project, build it for simulator, download it, and install it in the iOS simulator automatically.

1. Create this script and run it in a scratch folder of your choosing. A test project will be created within:

#!/bin/bash

set -e

exp init test --template blank
cd test

cat > App.js <<- EOM
import React from 'react';
import { StyleSheet, Text, View, Linking } from 'react-native';

export default class App extends React.Component {
  constructor(props) {
    super(props)
    this.state = { url: '' }
  }
  componentDidMount() {
    Linking.getInitialURL().then(url => this.setState({ url }))
  }
  render() {
    return (
      <View style={styles.container}>
        <Text>URL: {this.state.url}</Text>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
});
EOM

cat > app.json <<- EOM
{
  "expo": {
    "name": "test",
    "description": "This project is really great.",
    "slug": "test",
    "scheme": "test",
    "privacy": "public",
    "sdkVersion": "26.0.0",
    "platforms": ["ios", "android"],
    "version": "1.0.0",
    "orientation": "portrait",
    "icon": "./assets/icon.png",
    "splash": {
      "image": "./assets/splash.png",
      "resizeMode": "contain",
      "backgroundColor": "#ffffff"
    },
    "updates": {
      "fallbackToCacheTimeout": 0
    },
    "assetBundlePatterns": [
      "**/*"
    ],
    "ios": {
      "supportsTablet": true,
      "bundleIdentifier": "com.test.test"
    }
  }
}
EOM

rm -f /tmp/ios-app.tar.gz
exp build:ios --type simulator | grep -Eo "Successfully built standalone app: (.+)" | cut -d: -f2,3 | xargs curl -o /tmp/ios-app.tar.gz
rm -rf /tmp/test.app
tar -xvzf /tmp/ios-app.tar.gz -C /tmp

open /Applications/Xcode.app/Contents/Developer/Applications/Simulator.app
while : ; do
  count=$(xcrun simctl list | grep Booted | wc -l | sed -e 's/ //g')
  [ $count -lt 1 ] || break
  sleep 1
done

xcrun simctl install booted /tmp/test.app

1. Make sure the app is not currently running in the simulator, as we are not concerned with the behavior when the app is foregrounded

2. Launch the app in the simulator via Safari, such as test://thisshouldwork

3. Look for the URL being displayed in the app

Expected Behavior

The app should display: URL: test://thisshouldwork

Actual Behavior

The app displays: URL: test://

Reproducible Demo

See above installation script and demo video.

EDIT: changed wget to curl in the script

[yirui94]

Anyone still encountering this issue but when opening an App from a notification deep link?

[matb33]

Confirming that this is indeed resolved with SDK 27. 👍