0
我有我的谷歌地圖視圖嵌入在TabBar控制器,它是該選項卡中的第二項。該視圖加載地圖,但不顯示當前位置或定位按鈕。我已經編輯了該方案以包含要使用的版本的位置。谷歌地圖不顯示當前位置或定位按鈕
var locationManager = CLLocationManager()
var didFindMyLocation = false
override func viewDidLoad() {
super.viewDidLoad()
var camera = GMSCameraPosition.cameraWithLatitude(33.7,
longitude: -77.4, zoom: 8.0)
mapView.camera = camera
locationManager.delegate = self
locationManager.requestWhenInUseAuthorization()
mapView.addObserver(self, forKeyPath: "myLocation", options: NSKeyValueObservingOptions.New, context: nil)
// Do any additional setup after loading the view.
}
func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
if status == CLAuthorizationStatus.AuthorizedWhenInUse {
mapView.myLocationEnabled = true
}
}
override func observeValueForKeyPath(keyPath: String, ofObject object: AnyObject, change: [NSObject : AnyObject], context: UnsafeMutablePointer<Void>) {
if !didFindMyLocation {
let myLocation: CLLocation = change[NSKeyValueChangeNewKey] as! CLLocation
mapView.camera = GMSCameraPosition.cameraWithTarget(myLocation.coordinate, zoom: 10.0)
mapView.settings.myLocationButton = true
didFindMyLocation = true
}
}
我怎樣才能從該點用戶位置上啓用的位置?我在viewdidload中實現了上面的內容,並在if語句塊中添加了:mapView.camera = GMSCameraPosition.cameraWithTarget(mapView.myLocation.coordinate,zoom:10.0),但程序崩潰,因爲mapView.myLocation.coordinate爲零。 – wxcoder
@wxcoder地圖視圖在可用時從核心位置異步檢索當前,因此它不會立即可用。與你原來的例子中的位置將被檢索到更新observeValueForKeyPath中的相機,一切都應該沒問題。 – makeshiftJake