Question

我正在尝试创建一个根据位置显示项目的应用。不幸的是我的代码仍在运行，并且不会等到我找到用户位置。它返回一个nil值。我怎么能避免这个？这是可能的，我怎样才能实现它。我的代码在

之下

 override func viewDidLoad() {
    super.viewDidLoad()
    // check if locations eabled
     print("I got here 1")
    if CLLocationManager.locationServicesEnabled() {
        self.locManager.delegate = self
        self.locManager.desiredAccuracy = kCLLocationAccuracyBest
        self.locManager.requestWhenInUseAuthorization()
        self.locManager.startUpdatingLocation()
        print("I got here 2")
    }
    else {
        print ("Locations not enabled")
    }

    refresher = UIRefreshControl()
    refresher.attributedTitle = NSAttributedString(string: "Pull to Refresh")
    refresher.addTarget(self, action: "LoadItems", forControlEvents: UIControlEvents.ValueChanged)

    self.tableView.addSubview(refresher)

   LoadItems()

}

我的LoadItems函数需要运行位置

Answer 1

在您的代码中，您错过了locationManager.startUpdatingLocation()。将其添加到CLLocationManager.locationServicesEnabled() if-statement中，然后添加这两个功能

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
   // Here you can call a function when you have a location

   // And stop updating the location if you don´t need it anymore
   locationManager.stopUpdatingLocation()
}

func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {
    print("Failed to find user´s location: \(error.localizedDescription)")
}

这样你就可以确保

了

在致电您的方法时有一个位置
当您没有位置时发生错误

如果您想获得lat和long，请使用locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation])

let location:CLLocationCoordinate2D = manager.location!.coordinate
lat = String(location.latitude)
long = String(location.longitude)

我要求用户定位我的功能，但它返回nil

1 个答案: