didUpdateHeading方法在NativeScript 8.2中未被调用

Question

我正在尝试使用iOS，CLLocationManager，CLLocationManagerDelegate在本地文本CLLocationManagerDelegate应用程序中获取标题值。

LocationService.ts

​

import { Injectable } from "@angular/core";

@Injectable()
export class LocationService {
    
    private locationManager : CLLocationManager;
    constructor() {
        this.locationManager = CLLocationManager.alloc().init();
        this.locationManager.desiredAccuracy = 3;
        this.locationManager.distanceFilter = 0.1;
        this.locationManager.headingFilter = 0.1;
        this.locationManager.delegate = new LocationMangerDelegate();
        this.locationManager.requestWhenInUseAuthorization();
        this.locationManager.requestAlwaysAuthorization();
    }

    requestLocation(): void{
        this.locationManager.requestLocation();
    }

    startUpdatingLocation(): void {
        this.locationManager.startUpdatingLocation();
      }

      startUpdatingHeading(): void {
        this.locationManager.startUpdatingHeading();
      }
} 

class LocationMangerDelegate extends NSObject implements CLLocationManagerDelegate {
    public static ObjCProtocols = [CLLocationManagerDelegate];

    locationManagerDidUpdateLocations(manager: CLLocationManager, locations: NSArray<CLLocation> | CLLocation[]): void{
        console.log('we are in');
    };


    public locationManagerDidFailWithError(manager: CLLocationManager, error: NSError): void{
        console.log('error');
    };

    public locationManagerDidUpdateHeading(manager: CLLocationManager, newHeading: CLHeading): void{
        console.log('updated heading');
    };

    public locationManagerShouldDisplayHeadingCalibration(manager: CLLocationManager): boolean{
        console.log('header calibration');
        return true;
    };
}

​

TestComponent.ts

​

import { LocationService } from "../shared/location.service";

export class TestComponent implements OnInit{
    

    constructor(
        private locationService: LocationService) {
        this.locationService.startUpdatingHeading();
    }

​

Info.plist

​

<key>UIRequiredDeviceCapabilities</key>
        <array>
          <string>magnetometer</string>
            <string>gps</string>
      <string>location-services</string>
            <string>armv7</string>
        </array>
    
    <key>NSLocationWhenInUseUsageDescription</key>
        <string>Desc</string>
        <key>NSLocationAlwaysUsageDescription</key>
        <string>Des1</string>
        <key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
        <string>Des7</string>
       <key>NSLocationUsageDescription</key>
       <string>Desc123</string>

​

reference.d.ts

​

/// <reference path="./node_modules/@nativescript/types-ios/complete.d.ts"/>

​

当我从组件调用startUpdatingHeading方法时，不会触发LocationMangerDelegate类中的locationManagerDidUpdateHeading()方法。

我怎么才能把这事做好？我被困在这里，无法继续前进。

Answer 1

I能够使用

​

   private locationManager : CLLocationManager;
   constructor() {
      this.locationManager = CLLocationManager.alloc().init();
      this.locationManager.desiredAccuracy = 3;
      this.locationManager.distanceFilter = 0.1;
      this.locationManager.headingFilter = 0.1;
    }
    
    getDirection(): number {
    return this.locationManager?.heading?.trueHeading === undefined ? -1 :          this.locationManager?.heading?.trueHeading;
}

​