反应原生ios:默认情况下,geoloc的准确性很差

Question

我正在使用navigator.geolocation.watchPosition和getCurrentPosition实现健身跟踪器.它在Android和ios仿真器上工作正常,准确度为5/10m,但在iphone 5s上,我的准确度很差(50/65).

我发现当我在ios上同时运行现有的健身追踪器(strava)时,突然我的应用程序正在非常精确地检索GPS坐标.

很明显我必须缺少一些配置,因为默认情况下我的应用程序在iOS上使用不高.知道如何解决这个问题吗？

码:

const GPS_TIMEOUT_GET = 5000;
    const GPS_MAX_AGE = 1000;

    const GPS_DISTANCE_FILTER = 5;
    const GPS_TIMEOUT_WATCH = 60000;
    const GPS_MIN_ACCURACY = 50;

    //start the GPS into full time watching. Drains battery but brings best accuracy (required for our needs)
    let watchId = navigator.geolocation.watchPosition((position) => {
        }
        , (error) => {
            console.log(error);
        }
        , {
            enableHighAccuracy: true,
            timeout: GPS_TIMEOUT_WATCH,
            maximumAge: GPS_MAX_AGE,
            distanceFilter: GPS_DISTANCE_FILTER
        });

    //check GPS every X milliseconds)
    let intervalId = BackgroundTimer.setInterval(() => {
        navigator.geolocation.getCurrentPosition((geoPosition) => {
                if (geoPosition.coords.accuracy <= GPS_MIN_ACCURACY) {
                    let position = createPositionObjectFromGeoPosition(geoPosition);
                    dispatch({type: GPS_UPDATE_LOC, payload: position})
                }
            }
            , (error) => {
                console.log(error);
            }
            , {
                enableHighAccuracy: true,
                timeout: GPS_TIMEOUT_GET,
                maximumAge: GPS_MAX_AGE
            });
    }, time);

Info.plist的:

<key>NSLocationAlwaysUsageDescription</key>
<string>Your location is used to track your position during a ride and get feedback (distance ridden, duration, speed, etc) in real time and afterwards.</string>
<key>UIBackgroundModes</key>
<array>
    <string>location</string>
</array>
<key>UIRequiredDeviceCapabilities</key>
<array>
    <string>armv7</string>
    <string>location-services</string>
    <string>gps</string>
</array>

Answer 1

我使用https://github.com/timfpark/react-native-location,它使用iOS本地位置api,并更新了我的代码,以便

• 在android上,它保持不变并使用已经有效的w3c geolocation api

• 在iOS上,我开始跟踪上面的iOS专用api,而不是使用w3c geoloc函数'watchPosition'.为了定期检索位置,来自w3c geoloc的getPosition仍然有效(正如我的app同时运行strava时所观察到的那样),所以我保留了它(如果它不满意,可能会重构它以便在iOS上完全删除w3c api).

更新:经过多次用户反馈,我对Android API JS API watchPosition的准确性感到不满意.我的应用程序是一个健身追踪器,所以我需要非常高的准确性,但它可能会有所不同.我建议仔细测试,如果不满意,请使用原生的android API.