swift - Google API map 未显示在 TabBar 应用程序上

Question

我正在学习 Google map ，它在 SingleView 应用程序中完美运行。不过，我想改进我的应用程序并使用了选项卡栏菜单。我将 ViewController 与 MapView 连接到 TabBarController，然后 map 无法加载，只有空白方 block 而不是 map 。

我做错了什么？

编辑:

class ViewController: UIViewController, CLLocationManagerDelegate {

@IBOutlet weak var mapView: GMSMapView!

let locationManager = CLLocationManager()

override func viewDidLoad() {

    super.viewDidLoad()
    self.locationManager.requestWhenInUseAuthorization()
    self.locationManager.delegate = self
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
    self.locationManager.startUpdatingLocation()
    self.locationManager.startMonitoringSignificantLocationChanges()    
}

//MARK: Shows Google Map
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

    self.locationManager.stopUpdatingLocation()
    let locationArray = locations as NSArray
    let locationObj = locationArray.lastObject as! CLLocation
    let coord = locationObj.coordinate

    mapView.camera = GMSCameraPosition(target: coord, zoom: 15, bearing: 0, viewingAngle: 0)

    locationManager.stopUpdatingLocation()
}

func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) {

    if status == .AuthorizedWhenInUse {

        locationManager.startUpdatingLocation()

        mapView.myLocationEnabled = true
        mapView.settings.myLocationButton = true
    }
}

Answer 1

我想我找到了问题所在，至少现在一切正常。所以我搬家了

mapView.myLocationEnabled = true
mapView.settings.myLocationButton = true

在locationManager.stopUpdatingLocation()之前调用func locationManager(manager: CLLocationManager, didUpdateLocationslocations: [CLLocation])，现在它可以工作了。

但是我确实感觉我的代码很糟糕，它使用了 stopUpdatingLocation() 两次。就我而言，这是否意味着该应用程序在加载时只会获取用户位置一次？