Google 地图 IOS SDK 在解包时意外为 nil 在调用当前位置时可选

Question

我在使用 Google 地图 IOS SDK 时遇到问题。当我尝试呼叫当前位置时，出现错误 "unexpected nil when unwrapping optional"。似乎在引用 newLocation 变量时我得到了 nil。任何帮助将不胜感激。

import UIKit;
import GoogleMaps;
import CoreLocation;


class GoHomeController: UIViewController, CLLocationManagerDelegate{
@IBOutlet weak var mapView: GMSMapView! //View holding google map in main.storyboard

private var locationManager = CLLocationManager();

override func viewDidLoad() {
    super.viewDidLoad();
    let mapview = GMSMapView.mapWithFrame(CGRectZero, camera: GMSCameraPosition.cameraWithLatitude(35, longitude: -65, zoom: 10.0));
    locationManager.delegate = self;
    locationManager.requestAlwaysAuthorization();
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    self.locationManager.startUpdatingLocation();
    mapview.myLocationEnabled = true;
    mapView = mapview;


}
func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
    print("didFailWithError: \(error.description)");
    let errorAlert = UIAlertView(title: "Error", message: "Failed to Get Your Location", delegate: nil,cancelButtonTitle: "Ok");
    errorAlert.show();
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    let newLocation = locations.last as CLLocation!
    //print("current position: \(newLocation.coordinate.longitude) , \(newLocation.coordinate.latitude)")
    if let location = newLocation{
    updateMapFrame(location, zoom: 10.0);
    }
    }
func updateMapFrame(newLocation: CLLocation, zoom: Float) {
    let camera = GMSCameraPosition.cameraWithTarget(newLocation.coordinate, zoom: zoom)
    self.mapView.animateToCameraPosition(camera) // Error occurs here
}


}

谢谢大家的宝贵时间。

编辑：我忘了说 GoHomeController 只是我项目中的一个视图控制器。这不是主要的，我有一个通往它的转折点。

编辑#2：在模拟器中启动应用程序后发生错误，当我转到回家场景时。

Answer 1

这是一个众所周知的问题。在 Xcode 中编辑方案 -> 禁用金属 Api 将解决问题。

Google 地图 IOS SDK 在解包时意外为 nil 在调用当前位置时可选

Google Maps IOS SDK unexpected nil when unwrapping optional when calling for current location

xcode

google-maps

ios

google-maps-sdk-ios

swift2