Access Capacitor bridge from iOS App Delegate

Capacitor
#1

Hey there,

I am integrating OneSignal native code into a capacitor app.
I’m using the Quasar Framework, which uses Capacitor.

I can receive notifications and process them on the swift side of things. My receive-notification-logic resides in AppDelegate file.

I now want to pass the notification data over to Capacitor. So when the user logs in, I can retrieve his/her/their OneSignal id and send it to my API.
Or the other way around: When AppDelegate knows the OneSignal ID, trigger an event so the bridge can listen to this and send it via event or in a window variable to the Vue code.

Is there any way to achieve this?
I would be very grateful for any help.

Best regards
Nick

#2
#3

See the ways the app template’s AppDelegate accesses the bridge or emits an event. You’d do one of those two things.

#4

Thank you very much for your response. I tried to use “CAPBridge”, but its not working in application(), where I had to put the OneSignal code. Do I have to create a plugin, like @pitahausen noted?

Here’s the code I tried:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.

    // START OneSignal initialization code
    ...

    // promptForPushNotifications
    OneSignal.promptForPushNotifications(userResponse: { accepted in
      CAPBridge.triggerWindowJSEvent(eventName: "onOneSignalOptin", data: "test_id_1234")
    })
    // END OneSignal initializataion code

    return true
  }

Error message is:
Instance member "triggerWindowJSEvent" cannot be used on type "CAPBridge"; did you mean to use a value of this type instead?

Best regards

#5

If that doesn’t work I would try to create a plugin (you can just do it right in your native code, you don’t have to create a separate plugin project). Then have that plugin listen for a NotificationCenter event and send it from here instead of accessing CAPBridge

#6

@max Thank you very much again. I created a plugin (Files: OneSignalPlugin.swift and OneSignalPlugin.m).
But how can I initialize the Plugin? Is there any kind of constructor or automatic init method or can I call my initPlugin() method from anywhere?

// OneSignalPlugin.swift

import Capacitor

extension Notification.Name {
    static let onOneSignalOptin = Notification.Name("onOneSignalOptin")
}

@objc(OneSignalPlugin)

public class OneSignalPlugin: CAPPlugin {    
    /**
     * Add event listener for NotificationCenter
     *
     * @see AppDelegate.swift
     */
    @objc func initPlugin(_ call: CAPPluginCall) {
        print("Init OneSignalPlugin")
        NotificationCenter.default.addObserver(self, selector: #selector(optin(_:)), name: .onOneSignalOptin, object: nil)
        
        call.resolve()
    }
    
    /**
     * Executes on "onOneSignalOptin" event.
     *
     * How to listen in Javascript:
     * window.addEventListener('onOneSignalOptin', (oneSignalId) => { /* YOUR CODE HERE */ }
     */
    @objc func optin(_ notification:Notification) {
        print("OneSignalPlugin: optin")
        if let data = notification.userInfo as? [String: String]
        {
            for (identifier, value) in data
            {
                if (identifier == "oneSignalId")
                {
                    self.bridge.triggerWindowJSEvent(eventName: "onOneSignalOptin", data: value)
                }
            }
        }
    }
}

Best regards
Nick

#7

You want to override the load method which is a sort of constructor for the plugin:

#8

Hi, to use your plugin in ionic

first In the .m file define all methods
CAP_PLUGIN_METHOD(initPlugin, CAPPluginReturnPromise);

Ionic .ts file
import { Plugins } from ‘@capacitor/core’;
const { OneSignalPlugin } = Plugins;

now to use it:
OneSignalPlugin. initPlugin();

To send data from your .swift to .ts
@objc func initPlugin(_ call: CAPPluginCall) {
call.resolve([“status”:“ok”])
}

OneSignalPlugin. initPlugin().then((data)=>{
console.log(data);
})

Or events
self.notifyListeners(“eventName”, data: [“status”:“success”])

OneSignalPlugin.addListener(“eventName”, (data) => {
console.log(data);
})

Sorry bad english :'v

#9

@max thank you so much! This is how it worked! I’m so happy! I couldn’t use the window event but instead added a getStatus() to call from my javascript code.

Here is the full plugin:

import Capacitor

extension Notification.Name {
    static let onOneSignalOptin = Notification.Name("onOneSignalOptin")
}

@objc(OneSignalPlugin)

public class OneSignalPlugin: CAPPlugin {
    var notificationsEnabled: Bool = false
    var oneSignalId: String = "undefined"
    
    /**
     * Add event listener for NotificationCenter
     *
     * @see AppDelegate.swift
     */
    public override func load() {
        print("Init OneSignalPlugin")
        NotificationCenter.default.addObserver(self, selector: #selector(optin(_:)), name: .onOneSignalOptin, object: nil)
    }
    
    /**
     * Executes on "onOneSignalOptin" event.
     * Set oneSignalId so you can call getStatus() in your javascript code.
     *
     * e.g.: await window.Capacitor.Plugins.OneSignalPlugin.getStatus()
     */
    @objc func optin(_ notification:Notification) {
        print("OneSignalPlugin: optin")
        
        let oneSignalId = notification.userInfo?["oneSignalId"] ?? "undefined"
        let notificationsEnabled = notification.userInfo?["notificationsEnabled"] ?? false
        
        self.oneSignalId = oneSignalId as! String
        self.notificationsEnabled = notificationsEnabled as! Bool
    }
    
    @objc func getStatus(_ call: CAPPluginCall) {
        call.resolve([
            "notificationsEnabled": self.notificationsEnabled,
            "oneSignalId": self.oneSignalId
        ])
    }
}

and in AppDelegate:

...

OneSignal.promptForPushNotifications(userResponse: { accepted in
    print("User accepted notifications: \(accepted)")
    
    let oneSignalId = OneSignal.getPermissionSubscriptionState()?.subscriptionStatus.userId ?? "undefined"
    
    NotificationCenter.default.post(name: .onOneSignalOptin, object: nil, userInfo: [
        "notificationsEnabled": accepted,
        "oneSignalId": oneSignalId
    ])
  })
  
...

Also thanks to @pitahausen. Unfortunately I’m not using ionic framework, so I don’t have any .ts file. Otherwise I’m sure your solution would have worked.

Best regards
Nick

1 Like
#10

Awesome! Glad to hear it.

Went ahead and updated the docs to better explain the load methods for iOS and Android: https://capacitorjs.com/docs/plugins/ios#adding-initialization-logic

1 Like
#11

You should also be able to do something like this to get the CAPBridgeViewController and then use its bridge to call triggerWindowJSEvent or other bridge methods.

if let vc = window?.rootViewController as? CAPBridgeViewController {
    vc.bridge?..triggerWindowJSEvent(eventName: "onOneSignalOptin", data: "test_id_1234")
}