Question

首先，我是iOS开发的新手，所以请不要用客观的例子向我解释。

我的问题是：
我已经上过这堂课：

import UIKit
import CoreLocation

class BeaconRadar: NSObject, CLLocationManagerDelegate {

    var manager : CLLocationManager!
    var region  : CLBeaconRegion!

    var seenError           = false
    var locationFixAchieved = false
    var locationStatus      = "Not Started"

    init() {
        super.init()

        var major   = CLBeaconMajorValue( 10 )
        var uuid    = NSUUID( UUIDString: "E2C56DB5-DFFB-48D2-B060-D0F5A71096E0" )
        var id      = "test"

        manager = CLLocationManager()
        region  = CLBeaconRegion( proximityUUID: uuid, major: major, identifier: id )

        manager.delegate        = self
        manager.desiredAccuracy = kCLLocationAccuracyBest

        manager.requestAlwaysAuthorization()
        manager.startRangingBeaconsInRegion(region)
    }

    func locationManager(manager: CLLocationManager!, didRangeBeacons beacons: AnyObject[], inRegion region: CLBeaconRegion! ){

        if (locationFixAchieved == false) {
            locationFixAchieved = true

            println(beacons)

        }

    }

    // If failed
    func locationManager(_manager: CLLocationManager!, rangingBeaconsDidFailForRegion region: CLBeaconRegion!, withError error: NSError!){

        manager.stopUpdatingLocation()
        if (error) {
            if (seenError == false) {
                seenError = true
                println("Error getting location")
            }
        }
    }

    //  // authorization status
    func locationManager(_manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus){
        println("2")
        var shouldIAllow = false

        switch status {
            case CLAuthorizationStatus.Restricted:
                locationStatus = "Restricted Access"
            case CLAuthorizationStatus.Denied:
                locationStatus = "User denied access"
            case CLAuthorizationStatus.NotDetermined:
                locationStatus = "Status not determined"
            default:
                locationStatus = "Allowed Access"
                shouldIAllow = true
        }

        NSNotificationCenter.defaultCenter().postNotificationName("LabelHasbeenUpdated", object: nil)
        if (shouldIAllow == true) {
            println("Location Allowed")
            // Start location services
            manager.startUpdatingLocation()
        } else {
            println("Denied access: \(locationStatus)")
        }
    }
}

我的viewController是：

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

        var location = BeaconRadar()

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

我希望获得授权状态的实现功能中的一条消息。（BeaconRadar中的最后一个）。但我一无所获。

如果我在viewController中而不是在新类中实现所有这些方法（即：

class ViewController: UIViewController, CLLocationManagerDelegate {
.....
}

然后它会正常工作......

我错过了什么吗？

Answer 1

您已将BeaconRadar实例声明为viewDidLoad内的局部变量，因此只要此函数退出，BeaconRadar实例就会被释放。

您应该将BeaconRegion变量移出函数 -

class ViewController: UIViewController {

    let location = BeaconRadar()

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

CLLocationManagerDelegate没有捕获事件

1 个答案: