ios - 无法使用字符串创建 NSUUID

Question

我正在使用 SWIFT 在 iOS 中使用 iBeacon。当我尝试使用字符串创建 NSUUID 时。 XCode 给出一个奇怪的错误

ViewController.Type doesn't have a member named uuidString.

但实际上，我已经声明了var uuidString，并赋值给它

我也这样尝试 let uuid = NSUUID(UUIDString: "")，这可行。所以有人知道发生了什么事吗？

这是我的代码

import UIKit
import CoreLocation
import CoreBluetooth

class ViewController: UIViewController, CLLocationManagerDelegate {
    let uuidString:String! = "FDA50693-A4E2-4FB1-AFCF-C6EB07647825"
    let beaconUUID:NSUUID = NSUUID(UUIDString: uuidString)!

    let locationManager = CLLocationManager()

    let region = CLBeaconRegion(proximityUUID: beaconUUID, identifier: "Beacon")


    override func viewDidLoad() {
        super.viewDidLoad()

        locationManager.delegate = self
        // Do any additional setup after loading the view, typically from a nib.

        if CLLocationManager.authorizationStatus() != CLAuthorizationStatus.AuthorizedWhenInUse{
            locationManager.requestWhenInUseAuthorization()
        }

        //locationManager.startRangingBeaconsInRegion(region)
    }

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

Answer 1

您可以使用此代码

import UIKit
import CoreLocation
import CoreBluetooth

class ViewController: UIViewController, CLLocationManagerDelegate {


let locationManager = CLLocationManager()

let region:CLBeaconRegion = {
    let uuidString:String! = "FDA50693-A4E2-4FB1-AFCF-C6EB07647825"
    let beaconUUID:NSUUID = NSUUID(UUIDString: uuidString)!
    let result = CLBeaconRegion(proximityUUID: beaconUUID, identifier: "Beacon")
    return result
}()



override func viewDidLoad() {
    super.viewDidLoad()

    locationManager.delegate = self
    // Do any additional setup after loading the view, typically from a nib.

    if CLLocationManager.authorizationStatus() != CLAuthorizationStatus.AuthorizedWhenInUse{
        locationManager.requestWhenInUseAuthorization()
    }

    //locationManager.startRangingBeaconsInRegion(region)
}

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

你不能让你的属性默认值依赖于其他属性。