ios - 如何在 ios 8 中获取当前高度？

Question

我无法找到设备的海拔高度，我需要在我的应用程序中显示海拔高度我该怎么做？我试过了:

 var locationManager:CLLocationManager = CLLocationManager()

override func viewDidLoad() {

    super.viewDidLoad()
    self.locationManager = CLLocationManager()
    locationManager.requestWhenInUseAuthorization()
    self.locationManager.delegate = self
    self.locationManager.distanceFilter = kCLDistanceFilterNone
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
    self.locationManager.startUpdatingLocation()

}


func locationManager(manager: CLLocationManager!, didUpdateToLocation newLocation: CLLocation!, fromLocation oldLocation: CLLocation!) {
    var alt = newLocation.altitude
    print("\(alt)")
    manager.stopUpdatingLocation()
}

没有显示....

Answer 1

实际上你没有调用正确的委托(delegate)方法，你调用的是:locationManager(manager: CLLocationManager!, didUpdateToLocation newLocation: CLLocation!, fromLocation oldLocation: CLLocation!) 但能给你想要的是 locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]),

因此，如果您确实将 NSLocationWhenInUseUsageDescription 键实现到您的 Info.plist 文件中，并且如果弹出窗口显示您只需要删除您的函数并添加这个函数，它应该工作:

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    guard let lastLocation = locations.last else {
        NSLog("error no last location")
        return
    }
    let altitude = lastLocation.altitude
     // Do what you want with your altitude
}

我还建议您不要在此委托(delegate)函数内调用 locationManager.stopUpdatingLocation()。

希望对您有所帮助!

注意:此语法适用于 Swift 3.0，但我认为您只需删除 Swift 2.2 的委托(delegate)函数中的 _。