CXCallObserverDelegate: callChanged not triggering - ios

Question

I'm developing a NativeScript application which will make use of listening to the call state of the phone. For this i'm using CXCallObserver and CXCallObserverDelegate which I set up as following:
module.exports = {
phoneDelegate: NSObject.extend({
initWithResolveReject: function(resolve, reject){
var self = this.super.init();
if(self){
this.resolve = resolve;
this.reject = reject;
}
return self;
},
callObserverCallChanged: function(observer, call){
console.log("This log is not triggering");
if(call.hasEnded){
// call has ended
this.resolve({phoneState: "ended"});
}
if(call.isOutgoing && !call.hasConnected){
// Dialing out
this.resolve({phoneState: "outgoing call"});
}
if(!call.isOutgoing && !call.hasConnected && !call.hasEnded){
// Call is incoming
this.resolve({phoneState: "incoming call"});
}
if(call.hasConnected && !call.hasEnded){
// Call is ongoing
this.resolve({phoneState: "ongoing call"});
}
}
}, {
protocols: [CXCallObserverDelegate]
}),
registerListener: function(){
return new Promise((resolve, reject) => {
try{
this.callObserver = new CXCallObserver();
let myCallDelegate = this.phoneDelegate.alloc().initWithResolveReject(resolve, reject);
this.callObserver.setDelegateQueue(myCallDelegate, null);
console.log("phone listener registered");
} catch(error) {
reject({error: error});
}
})
}
}
The listener is getting registered as it should, at least no errors are thrown and the last console log in "registerListener" is executed as it should.
When I try to make a phone call, either incoming or outgoing nothing happens. At least the first console log in "callObserverCallChanged" should execute on any phone state change. But nothing happens.
Any one got any suggestion what might be wrong?

Answer 1

let myCallDelegate =
this.phoneDelegate.alloc().initWithResolveReject(resolve, reject);
this.callObserver.setDelegateQueue(myCallDelegate, null);
Ok the solution was quite embarrassing. The myCallDelegate instance was destroyed before doing anything due to not assigning it to the class. Well here is the solution:
this.myCallDelegate = this.phoneDelegate.alloc().initWithResolveReject(resolve, reject);
this.callObserver.setDelegateQueue(this.myCallDelegate, null);
Shoutout to tsonevn for taking his time and finding this misstake.