Swift 谷歌地图不在Iphone上显示，但在iOS模拟器上运行

这是地图的代码，我可以在iPhone屏幕的左下角看到谷歌图标，也可以得到任何正在搜索但地图未加载的地方的位置

    mapView.settings.compassButton = true
    mapView.isMyLocationEnabled = true
    mapView.settings.myLocationButton = true
    mapView.settings.allowScrollGesturesDuringRotateOrZoom = true
    mapView.animate(toZoom: 11)
    if CLLocationManager.locationServicesEnabled() {
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
        locationManager.requestWhenInUseAuthorization()
        //locationManager.startUpdatingLocation()
    }
    let camera = GMSCameraPosition.camera(withLatitude: locationManager.location!.coordinate.latitude, longitude:
          locationManager.location!.coordinate.longitude, zoom: 15);
    self.mapView.camera = camera

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你有什么错误吗？