Ios 如何设置自定义距离过滤器，是否可以在Swift中设置？

我是新来的

Swift

，我试着用这个

不知道为什么此代码不起作用：

//start  mehtod out of scope
lazy var locationManager: CLLocationManager! = {
    let locationManager = CLLocationManager()


    //configeration for  user location access
    //The delegate object to receive update events.
    locationManager.delegate = self
    //The receiver does its best to achieve the requested accuracy
    //locationManager.desiredAccuracy = kCLLocationAccuracyBest
     self.locationManager.distanceFilter = 10.0
    //Requests permission to use location services while the app is in the foreground
    locationManager.requestWhenInUseAuthorization()
    //allow update notification when apps stay on background
    locationManager.allowsBackgroundLocationUpdates = true

    return locationManager
}() 

当我设置时，它工作正常：

locationManager.desiredAccuracy = kCLLocationAccuracyBest

那么我想要什么：

---

我想在每250米后获得LAT和LONG，如果用户改变位置，则连续15分钟调用一种方法

 pushLocation(lat:double,long:double)

---

根据您的问题，您希望在每250米之后获得

LAT

和

LONG

？ 因此，这里是

目标C代码

：（感谢链接：）

首先调用此方法并存储此新位置，然后您需要连续查找其他lat和long当任何（lat，long）与此存储位置匹配时，则表示您已行驶250米：

以下是SWIFT3.0代码：

func locationByMovingDistance(distanceMeters: Double, withBearing bearingDegrees: CLLocationDirection) -> CLLocation {
    let distanceRadians: Double = distanceMeters / (6372797.6)
        // earth radius in meters
    let bearingRadians: Double = bearingDegrees * M_PI / 180
    var lat1: Float = self.coordinate.latitude * M_PI / 180
    var lon1: Float = self.coordinate.longitude * M_PI / 180
    var lat2: Float = asin(sin(lat1) * cos(distanceRadians) + cos(lat1) * sin(distanceRadians) * cos(bearingRadians))
    var lon2: Float = lon1 + atan2(sin(bearingRadians) * sin(distanceRadians) * cos(lat1), cos(distanceRadians) - sin(lat1) * sin(lat2))
    return CLLocation(latitude: lat2 * 180 / M_PI, longitude: lon2 * 180 / M_PI)
}

---

如果您有任何进一步的问题，请随时发表评论。希望能有所帮助。

这是我正在使用的代码-全部在Swift 3.0中

locationManager的此设置将考虑您所追求的距离过滤和精度：

lazy var locationManager: CLLocationManager = {
    [unowned self] in
    var _locationManager = CLLocationManager()
    _locationManager.delegate = self
    _locationManager.desiredAccuracy = [Your Value For trackingAccuracy - see below]
    _locationManager.distanceFilter = [Your Value For the filter i.e., 250 for 250 meters]
    _locationManager.allowsBackgroundLocationUpdates = true
    _locationManager.pausesLocationUpdatesAutomatically = false 
    _locationManager.activityType = .fitness
    return _locationManager
    }()

精度设置将来自位置管理器中的预定义设置，例如，KCLLOCATIONACURACYNEARESTENMERS或KCLLOCATIONACURACYHUNDREDMERS

允许后台更新的选项允许您获得新的积分，即使您的应用程序不在前台。如果手机会不时停止移动，则必须自动关闭“暂停”-否则，如果用户停止休息5分钟而无法重新打开，则会自动关闭“捕获”-完成后必须重置这些设置

授权状态应在单独的检查中处理，如下所示，以便您可以在尚未授予授权的情况下请求授权：

    if CLLocationManager.authorizationStatus() != .authorizedAlways     // Check authorization for location tracking
    {
        locationManager.requestAlwaysAuthorization()                    // Will callbackdidChange... once user responds
    } else {
        locationManager.startUpdatingLocation()
    }

由于获得授权有延迟，如果您必须发出请求，您需要等待请求它开始更新位置，直到收到locationManager的回复，您可以按如下操作：

@nonobjc func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
    switch status
    {
    case .authorizedAlways:
        locationManager.startUpdatingLocation()

    default:
        [Whatever you want to do - you can't get locations]
    }
}

我需要.authorized.ways，您可能会逃脱。authorized.whenuse取决于您的用例

我在locationManager返回给我的位置中检查准确性字段的基础上，添加了一个额外的准确性过滤器。注意，有单独的水平和垂直精度值（以米为单位的置信距离）；如果要使用高程值，则需要注意第二个精度值，因为iPhone中的高程本质上不太准确

我还检查新的点是在前一点之后捕获的-有时会出现无序值并指示“问题”值。我已经读到，您可能会得到小于0的精度值来指示问题，因此您可能希望在使用该位置之前检查该值，尽管我没有看到该问题。代码如下：

// Called back by location manager - passes arrays of new CLLocation points captured. With distanceFilter set to 250, this will get called for a change of 250M.  You'll want to save the value for your timed pushLocation function.

// This function needs to be trim as it continues to be called when TrailHead is in the background and, if 
// we take too long we'll get killed by iOS.

var savePosition: CLLocationCoordinate2D?
private var latestTimeProcessed = Date()  // Initialize to ensure any point accepted received after initialization

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
{
    for location in locations {
        if latestTimeProcessed.compare(location.timeStamp) == .orderedAscending        // Out of seq indicates a locationManager problem - discard
            && location.horizontalAccuracy < [Whatever accuracy limit you want to use]    // Applying a user-selected quality filter
        {
            latestTimeProcessed = location.timeStamp      // Used to discard any earlier timestamped points returned by the location manager
            [PROCESS THE POSITION HERE - E.G.]

            savePosition = locations.last

        }
    }
}

---

希望这有帮助…

您是否在项目设置中设置了所有必需的权限？是的，当我设置locationManager.desiredAccuracy=KCallocationAccuracy时，它工作正常。您想要什么距离过滤器？分享确切的description@ShobhakarTiwari250米。我要过滤的距离U要250作为直径I要获得LAT和LONG在每250米后如果用户改变位置，则连续15分钟调用方法pushLocation（LAT:double，LONG:double）我已经注意到在第一个代码块中设置过滤器的位置为250米，并在我发布的答案编辑的最后一个代码块中添加了计时器代码。latestTimeProcessed我不明白如何声明它只是一个日期属性；为了声明和初始化它，我使用了：private var latestTimeProcessed=Date（），我将在上面添加它。很高兴我能提供帮助-希望苹果能让他们的API文档在这样的事情上更有用，但在他们分享我们通过StackExchange学到的知识之前，这是关键（我在这里找到了将其组合在一起的部分）。

private var myTimer: Timer? = nil  
private var longInterval = 900.0     // 900 seconds = 15 minutes

override func viewDidLoad()
{
    ....
        myTimer = Timer(timeInterval: timerInterval, target: myself, selector: #selector(myself.pushLocation), userInfo: nil, repeats: true)
        RunLoop.current.add(myTimer!, forMode: RunLoopMode.commonModes)
    ....
}

pushLocation(lat:double,long:double){
    [Use savePosition.latitude, savePosition.longitude]
}