Ios GMSMapView更新相机位置，以便在导航过程中始终显示朝向顶部的方向

我已使用“方向角”属性在mapview上旋转摄影机，但无法定位摄影机，使其始终显示朝向顶部的导航

下面是谷歌地图应用程序的屏幕截图，它在导航过程中自动旋转，以便始终显示朝向顶部的路线

下面是我的应用程序的屏幕截图，它总是显示任何方向的路线，如

我使用了下面的代码来旋转相机，但我真的不知道如何获得所需的方位角s，它将始终显示在顶部方向

            let cameraPosition = GMSCameraPosition.camera(withTarget: currentLocation, zoom: self.camera.zoom, bearing: MyRide.shared.bearing, viewingAngle: 45)
        let cameraUpdate = GMSCameraUpdate.setCamera(cameraPosition)

        CATransaction.begin()
        CATransaction.setValue(1.0, forKey: kCATransactionAnimationDuration)
        self.animate(with: cameraUpdate)
        CATransaction.commit()

使用下面的轴承计算方法，您将获得所需的起点到终点的轴承

func degreesToRadians(degrees: Double) -> Double { return degrees * .pi / 180.0 }
func radiansToDegrees(radians: Double) -> Double { return radians * 180.0 / .pi }

func getBearingBetweenTwoPoints(point1 : CLLocationCoordinate2D, point2 : CLLocationCoordinate2D) -> Double {

    let lat1 = degreesToRadians(degrees: point1.latitude)
    let lon1 = degreesToRadians(degrees: point1.longitude)

    let lat2 = degreesToRadians(degrees: point2.latitude)
    let lon2 = degreesToRadians(degrees: point2.longitude)

    let dLon = lon2 - lon1

    let y = sin(dLon) * cos(lat2)
    let x = cos(lat1) * sin(lat2) - sin(lat1) * cos(lat2) * cos(dLon)
    let radiansBearing = atan2(y, x)

    return radiansToDegrees(radians: radiansBearing)
}

如果你想动态地从你的路径中获得方向，那么你必须根据你的需要得到当前路线的终点

func degreesToRadians(degrees: Double) -> Double { return degrees * .pi / 180.0 }
func radiansToDegrees(radians: Double) -> Double { return radians * 180.0 / .pi }

func getBearingBetweenTwoPoints(point1 : CLLocationCoordinate2D, point2 : CLLocationCoordinate2D) -> Double {

    let lat1 = degreesToRadians(degrees: point1.latitude)
    let lon1 = degreesToRadians(degrees: point1.longitude)

    let lat2 = degreesToRadians(degrees: point2.latitude)
    let lon2 = degreesToRadians(degrees: point2.longitude)

    let dLon = lon2 - lon1

    let y = sin(dLon) * cos(lat2)
    let x = cos(lat1) * sin(lat2) - sin(lat1) * cos(lat2) * cos(dLon)
    let radiansBearing = atan2(y, x)

    return radiansToDegrees(radians: radiansBearing)
}