ios - 无法访问不同类的变量

Question

我正在将应用程序更新到 Swift 2.0，但是我遇到了 CLLocationManager 的问题。

我已经使用这段代码一段时间了，所以我有点困惑为什么它突然在 2.0 中成为一个问题。我正在使用一个全局变量(我知道是懒惰的)，但除了声明它的类之外，它似乎无法在任何其他类中访问。我收到此错误:

Use of unresolved identifier 'locationManager'

这是我在声明 locationManager 的类中的代码:

var locationManager = CLLocationManager()

class InitalViewController: UITableViewController, UISearchBarDelegate, UISearchDisplayDelegate {
        if #available(iOS 8.0, *) {
        locationManager.requestAlwaysAuthorization()
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.startUpdatingLocation()

        if CLLocationManager.locationServicesEnabled() {
            //Requests location use from user for maps
            locationManager.requestWhenInUseAuthorization()
        }
    }
}

这是另一个类中的代码:

@IBAction func centerOnLocation(sender: AnyObject) {
    if locationManager.location != nil {
        let locationCamera = MKMapCamera()
        locationCamera.heading = parkPassed.orientation!
        locationCamera.altitude = 600
        locationCamera.centerCoordinate.latitude = locationManager.location.coordinate.latitude
        locationCamera.centerCoordinate.longitude = locationManager.location.coordinate.longitude

        mapView.setCamera(locationCamera, animated: true)
    }
}

大家有什么想法吗？

Answer 1

您可以实现 CLLocationManager 的扩展以将实例用作单例。

extension CLLocationManager{

  class var sharedManager : CLLocationManager {
    struct Singleton {
      static let instance = CLLocationManager()
    }
    return Singleton.instance
  }
}

然后你就可以在任何类中访问单例了

@IBAction func centerOnLocation(sender: AnyObject) {
    let locationManager = CLLocationManager.sharedManager
    if locationManager.location != nil {
        let locationCamera = MKMapCamera()
        locationCamera.heading = parkPassed.orientation!
        locationCamera.altitude = 600
        locationCamera.centerCoordinate.latitude = locationManager.location.coordinate.latitude
        locationCamera.centerCoordinate.longitude = locationManager.location.coordinate.longitude

        mapView.setCamera(locationCamera, animated: true)
    }
}