Question

为节省电量，我想每隔30秒拨打requestLocation()以获取新位置。

DispatchQueue.main.asyncAfter(deadline: .now() + 30) {
  self.requestLocation()
}

但我这里有问题。被调用的requestLocation()，didUpdateLocations，但CLLocation并未一直改变。附：我在模拟器中使用Freeway Drive

<+37.42467819,-122.22918858> +/- 5.00m (speed 35.86 mps / course 311.13) @ 29.01.2018, 12:00:10 Восточная Европа, стандартное время
<+37.42467819,-122.22918858> +/- 5.00m (speed 35.86 mps / course 311.13) @ 29.01.2018, 12:00:40 Восточная Европа, стандартное время
<+37.42467819,-122.22918858> +/- 5.00m (speed 35.86 mps / course 311.13) @ 29.01.2018, 12:01:10 Восточная Европа, стандартное время

如果我在没有截止日期前只拨打requestLocation()，那么所有工作都会完美无缺。

你有什么想法我做错了吗？

Answer 1

当您拨打CLLocationManager startUpdatingLocation方法时，CLLocationManager将更新位置，直到您调用停止搜索位置的stopUpdatingLocation方法

假设您的requestLocation()方法正在调用manager.startUpdatingLocation()，其中经理是var manager = CLLocationManager()，您需要在CLLocationManagerDelegate方法{{1}收到有效位置时停止请求位置调用你的代码将是这样的

didUpdateLocations

Answer 2

请参阅此（您的值的更改时间参数）

internal func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    if let newLocation = locations.last
    {
        let locationAge = -newLocation.timestamp.timeIntervalSinceNow
        if locationAge > 5.0
        {
            return
        }
        if newLocation.horizontalAccuracy < 0
        {
            return
        }


    }

}

Answer 3

        self.locationManager = CLLocationManager()
        guard let locationManager = self.locationManager else {
            return
        }

        if CLLocationManager.authorizationStatus() == .notDetermined {
            // you have 2 choice
            // 1. requestAlwaysAuthorization
            // 2. requestWhenInUseAuthorization
            locationManager.requestAlwaysAuthorization()
        }

        locationManager.desiredAccuracy = kCLLocationAccuracyBest // The accuracy of the location data
        locationManager.distanceFilter = 200 //The minimum distance (measured in meters) a device must move horizontally before an update event is generated.

因此，将locationManager上的distanceFilter更改为最小距离将调用委托而不会超时。

获取超时的位置

3 个答案: