iPhone GPS 用户位置在手机静止时来回移动

Question

我正在做一些 mapkit 和 corelocation 编程来绘制用户路线。例如。他们去散步，它显示了他们所走的路。

在模拟器上一切正常 100%。

在 iPhone 上我遇到了一个大问题，我不知道该怎么办。为了确定用户是否已经“停止”，我基本上检查了一段时间内速度是否（几乎）为 0。

但是，仅保留手机仍然会为新更新的位置更改吐出此日志（来自位置管理器代表）。这些是 locationManager(_:didUpdateLocations:) 回调中的连续更新。

speed 0.021408926025254 with distance 0.192791659974976
speed 0.0532131983839802 with distance 0.497739230237728
speed 11.9876451887096 with distance 15.4555990691609
speed 0.230133198005176 with distance 3.45235789063791
speed 0.0 with distance 0.0
speed 0.984378335092039 with distance 11.245049843458
speed 0.180509147029171 with distance 2.0615615724029
speed 0.429749086272364 with distance 4.91092459284206

现在我将准确度设置为最佳：

_locationManager                    = CLLocationManager()
_locationManager.delegate           = self
_locationManager.distanceFilter     = kCLDistanceFilterNone
_locationManager.desiredAccuracy    = kCLLocationAccuracyBest

您知道是否有设置或者我可以更改以防止这种来回行为。甚至当手机静止时，用户 pin 也会每隔几秒左右疯狂移动。

或者我还需要编写其他代码来解释这种狂野的招摇吗？

Answer 1

我检查用户是否在一定时间内移动了一定距离以确定他们是否已经停止（感谢 rmaddy 提供的信息）：

/**
    Return true if user is stopped. Because GPS is in accurate user must pass a threshold distance to be considered stopped.
*/
private func userHasStopped() -> Bool
{
    // No stop checks yet so false and set new location
    if (_lastLocationForStopAnalysis == nil)
    {
        _lastLocationForStopAnalysis = _currentLocation
        return false
    }

    // If the distance is greater than the 'not stopped' threshold, set a new location
    if (_lastLocationForStopAnalysis.distanceFromLocation(_currentLocation) > 50)
    {
        _lastLocationForStopAnalysis = _currentLocation
        return false
    }

    // The user has been 'still' for long enough they are considered stopped
    if (_currentLocation.timestamp.timeIntervalSinceDate(_lastLocationForStopAnalysis.timestamp) > 180)
    {
        return true
    }

    // There hasn't been a timeout or a threshold pass to they haven't stopped yet
    return false
}