速度标签值不会随着用户驾驶汽车而改变

Question

我是 swift 新手 .. 我已经实现了 Google maps sdk，我还想在用户开始移动或驾驶他/她的汽车时显示速度。

我正在使用 CLLocationSpeed 并将其存储在变量中。

现在，当用户单击开始按钮进行导航时，我正在获取速度值，但它不会随着用户移动而改变。 我想让它更有活力。

我已经附上了相同标签的代码和图像..

 var locationManager: CLLocationManager
 var speedlabel: UILabel = UILabel()
 var timerspeed: Timer?
 var speed: CLLocationSpeed = CLLocationSpeed()


@objc func runspeedcheck() {
        speedlabel.text = "\(speed)kph"

    }

func startnavigation {

 timerspeed = Timer(timeInterval: 1.0, target: self, selector: #selector(runspeedcheck), userInfo: nil, repeats: true)
}

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        speed = locationManager.location!.speed
}

是让它更加动态的正确方法，还是有什么方法可以在用户移动时更改速度标签 任何帮助表示赞赏！

感谢和问候

Answer 1

无需创建单独的CLLocationSpeed 变量来获取speed 更新。

你可以这样做，

class VC: UIViewController, CLLocationManagerDelegate {
    @IBOutlet weak var speedlabel: UILabel!
    var locationManager = CLLocationManager()

    override func viewDidLoad() {
        super.viewDidLoad()
        locationManager.delegate = self
        locationManager.requestWhenInUseAuthorization()
        locationManager.startUpdatingLocation()
    }

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        if let speed = manager.location?.speed {
            self.speedlabel.text = String(describing: speed)
        }
    }
}

以上是示例代码。根据您的要求进行修改。

Answer 2

   func getUserSpeed() {
     var speed: CLLocationSpeed = CLLocationSpeed()
     guard let userSpeed = locationManager.location?.speed else { return }
     speed = userSpeed
     if speed < 0 { speed = 0 }
    speedLabel.text = String(format: "%.0f km/h", speed * 3.6)
   }