CLLocationManager 未确定位置

Question

我在获取用户的当前位置时遇到了一些问题。我意识到关于这个主题有很多问题，但我已经阅读了它们并完全按照 Apple 文档告诉我的去做了，但它仍然不起作用。

我的 MasterViewController 中有以下代码：

class MasterViewController: UITableViewController, CLLocationManagerDelegate {

var detailViewController: DetailViewController? = nil

var locationManager:CLLocationManager!

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    self.navigationItem.leftBarButtonItem = self.editButtonItem()
    let addButton = UIBarButtonItem(barButtonSystemItem: .Add, target: self, action: "printPlace:")
    self.navigationItem.rightBarButtonItem = addButton
    if let split = self.splitViewController {
        let controllers = split.viewControllers
        self.detailViewController = controllers[controllers.count-1].topViewController as? DetailViewController
    }

    if !CLLocationManager.locationServicesEnabled() {
        println("location services disabled")
    }
    locationManager = CLLocationManager()
    locationManager.delegate = self
    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    locationManager.distanceFilter = kCLDistanceFilterNone
    locationManager.requestAlwaysAuthorization()
    locationManager.startUpdatingLocation()
}


func locationManager(manager:CLLocationManager, didUpdateLocations locations:[AnyObject]) {
    println("found location")
}

@IBAction func printPlace(sender: AnyObject) {
    let currentLocation: CLLocationCoordinate2D = locationManager.location.coordinate
    println("\(currentLocation.latitude) , \(currentLocation.longitude)")
}

我还在 info.plist 中添加了 NSLocationWhenInUseUsageDescription 键。但是，当我运行此代码时，永远不会调用 didUpdateLocations，并且 printPlace 会给出致命错误，因为 locationManager.location 为 nil。谁能看到我在这里做错了什么？

Answer 1

啊，问题可能是您说您为 NSLocationWhenInUseUsageDescription 更新了 .plist，但在您的代码中您调用 locationManager.requestAlwaysAuthorization()，这是不同的。您需要将正确的添加到 .plist (NSLocationAlwaysUsageDescription)，或者仅在使用时请求：locationManager.requestWhenInUseAuthorization()。

此外，正如您对原始帖子的评论指出的那样，它应该是 NSLocationWhenInUseUsageDescription，而不是 NSLocationWhenInUsageDescription