何时必须调用 [self.locationManager startUpdatingLocation] 以及何时必须停止？

Question

如果我这样写：

[self.locationManager startUpdatingLocation];
[self.locationManager stopUpdatingLocation];

坐标如何准确？

Answer 1

您可以在 viewWillAppear 中执行 locationManager.startUpdatingLocation()，然后在 didUpdateLocations 中执行，当您有一个位置时，您可以检查 [horizontalAccuracy][1] 属性，这将

The radius of uncertainty for the location, measured in meters. (read-only)

您可以使用此行

访问didUpdateLocations中的horizontalAccuracy

let horizontalAccuracy: CLLocationAccuracy = manager.location!.horizontalAccuracy

如果您对结果满意可以停止更新，否则继续。

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
     let location:CLLocationCoordinate2D = manager.location!.coordinate
     lat = String(location.latitude)
     long = String(location.longitude)

     let horizontalAccuracy: CLLocationAccuracy = manager.location!.horizontalAccuracy
     if (horizontalAccuracy < 5.0){
         locationManager.stopUpdatingLocation()
     } 
}

如果发生错误，您可以重试

func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {
    locationManager.requestLocation()
}

何时必须调用 [self.locationManager startUpdatingLocation] 以及何时必须停止？

When i have to call [self.locationManager startUpdatingLocation] and when i have to stop?

core-location

cllocationmanager

ios