cordova-plugin-geolocation watchPosition() 方法不起作用

Question

我正在开发 Ionic2-Angular2-Typescript 应用程序。我正在尝试使用 Cordova 的 Geolocation 插件，但是当我调用 http://ionicframework.com/docs/v2/native/geolocation/ 中的 watchPosition 方法时，编辑器向我显示了一些错误：

Error TS2339: Property 'code' does not exist on type 'Geoposition | PositionError'.

Error TS2339: Property 'coords' does not exist on type 'Geoposition | PositionError'.

这是我的代码：

import { Injectable } from '@angular/core';
import { Http } from '@angular/http';
import 'rxjs';
import { Observable } from 'rxjs/Observable';
import { Geolocation, PositionError, Geoposition } from 'ionic-native';

export class LocationProvider {

    constructor(private http: Http) {}

    var subscription = Geolocation.watchPosition()
                          .filter((p) => p.code === undefined) //Filter Out Errors
                          .subscribe(position => {
  console.log(position.coords.longitude + ' ' + position.coords.latitude);
});
}

Answer 1

最后，我解决了我的问题如下：

this.subscription = Geolocation.watchPosition().subscribe(position => {
    if ((position as Geoposition).coords != undefined) {
      var geoposition = (position as Geoposition);
      console.log('Latitude: ' + geoposition.coords.latitude + ' - Longitude: ' + geoposition.coords.longitude);
    } else { 
      var positionError = (position as PositionError);
      console.log('Error ' + positionError.code + ': ' + positionError.message);
    }
});

Answer 2

在回调函数中设置一个类型怎么样？如果您对错误不感兴趣，可以使用更短的代码。

类似这样的东西（未测试）：

this.subscription = Geolocation.watchPosition()
    .filter((p: any) => p['code'] === undefined) // Filter Out Errors
    .subscribe((position: GeoPosition) => {
        console.log(position.coords.longitude + ' ' + position.coords.latitude);
    });

cordova-plugin-geolocation watchPosition() 方法不起作用

cordova-plugin-geolocation watchPosition() method not working

typescript

cordova-plugins

ionic2

angular