swift - 我试图在 Swift 3 中以设定的时间间隔获取位置更新，但它每个时间间隔都会运行我的函数很多次，它应该只运行一次

Question

我使用 locationManager.startUpdatingLocation() 获取用户的位置，然后调用一个处理我所有逻辑的函数，问题是它似乎被调用了多次，我不知道为什么。

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    let locValue:CLLocationCoordinate2D = manager.location!.coordinate
    print("locations = \(locValue.latitude) \(locValue.longitude)")

    long = locValue.longitude
    lat = locValue.latitude

    if(self.arrayOfCellData.count > 0)
    {

        for i in 0...self.arrayOfCellData.count-1
        {
            getdistance(lat0: self.arrayOfCellData[i].shop.latitude!, long0: self.arrayOfCellData[i].shop.longitude!, lat1: locValue.latitude, long1: locValue.longitude)
            {distance in

                self.arrayOfCellData[i].meterstolocation = distance
            }
        }
        DispatchQueue.main.async {
            self.myTable.reloadData()
        }
    }
    print("stopped updating")
    locationManager.stopUpdatingLocation()
}

var run: Bool = true;

func updateLocations()
{
    if(run)
    {
        run = false;
    }
    else
    {
        locationManager.startUpdatingLocation()
    }
}

override func viewDidLoad() {
    super.viewDidLoad()
//

    locationManager.requestAlwaysAuthorization()
    //
    //
    //
    if CLLocationManager.locationServicesEnabled() {
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.pausesLocationUpdatesAutomatically = false
        locationManager.startUpdatingLocation()

        Timer.scheduledTimer(timeInterval: 10,
                             target: self,
                             selector: #selector(self.updateLocations),
                             userInfo: nil,
                             repeats: true)
    }

我的输出是:

locations = 37.33228724 -122.05833354
stopped updating
locations = 37.33228724 -122.05833354
stopped updating
locations = 37.33228724 -122.05833354
stopped updating
locations = 37.33228724 -122.05833354
stopped updating
locations = 37.33228724 -122.05833354

输出本身是正确的，但它一口气输出了多个打印内容。而且我不希望代码多次运行，每个时间间隔只运行一次。

Answer 1

获取位置后不应调用 locationManager.stopUpdatingLocation()，并且不需要计时器。只需在开始时调用一次 locationManager.startUpdatingLocation() ，它就会自动向您发送更新，但仅当位置发生变化时。请参阅文档 https://developer.apple.com/reference/corelocation/cllocationmanager