无法使用 'NSNumber' 类型的索引下标“[Int : UIColor]”类型的值

Question

美好的一天。我试图遵循本教程 https://www.youtube.com/watch?v=3jJiqzbzutU 并收到此错误消息无法使用索引类型 NSNumber 为类型“[Int : UIColor]”的值下标。我做了他在教程中做的同样的事情，但出了问题。请帮忙。错误来自这行代码

self.view.backgroundColor = self.colors[closestBeacon.major]。

这是我的代码供参考。

class ViewController: UIViewController, CLLocationManagerDelegate {

let locationManager = CLLocationManager()
let region1 = CLBeaconRegion(proximityUUID: NSUUID(UUIDString: "myuuidString")!, identifier: "skybeacon1")

let colors = [2: UIColor.redColor(), 1: UIColor.blueColor()]

override func viewDidLoad() {
    super.viewDidLoad()

    locationManager.delegate = self

    if CLLocationManager.authorizationStatus() != CLAuthorizationStatus.AuthorizedWhenInUse {
        locationManager.requestWhenInUseAuthorization()
    }
    locationManager.startRangingBeaconsInRegion(region1)
}

func locationManager(manager: CLLocationManager, didRangeBeacons beacons: [CLBeacon], inRegion region: CLBeaconRegion) {
    let knownBeacons = beacons.filter{ [=11=] .proximity != CLProximity.Unknown }
    if knownBeacons.count > 0 {
        let closestBeacon = knownBeacons[0] as CLBeacon
        self.view.backgroundColor = self.colors[closestBeacon.major]
    }
}
}

Answer 1

CLBeacon.major 是属性，returns 是 NSNumber。只需使用 closestBeacon.major.integerValue

Answer 2

NSNumber和Int有区别但有关联，直接投就可以了（不强求）

let closestBeacon = knownBeacons[0] // as CLBeacon is not needed, the compiler knows the type
self.view.backgroundColor = self.colors[closestBeacon.major as Int]

Answer 3

您好，如果您在 swift4 中编程，请使用：

closestBeacon.major.intValue

而不是

closestBeacon.major.integerValue

无法使用 'NSNumber' 类型的索引下标“[Int : UIColor]”类型的值

Cannot subscript a value of type '[Int : UIColor]' with an index of type 'NSNumber'

ios

ibeacon

swift