Question

美好的一天。我试图按照本教程https://www.youtube.com/watch?v=3jJiqzbzutU进行此错误消息无法下标类型＆＃39; [Int：UIColor]＆＃39;索引类型为NSNumber。我做了他在教程中做的同样的事情，这出错了。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{ $0 .proximity != CLProximity.Unknown }
    if knownBeacons.count > 0 {
        let closestBeacon = knownBeacons[0] as CLBeacon
        self.view.backgroundColor = self.colors[closestBeacon.major]
    }
}
}

Answer 1

CLBeacon.major是一个返回NSNumber的属性。只需使用closestBeacon.major.integerValue

即可

Answer 2

NSNumber和Int不同但相关，只是投了它（不是强制的）

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

你好如果你在swift 4中编程，请使用：

closestBeacon.major.intValue

而不是

closestBeacon.major.integerValue

不能下标类型的值＆＃39; [Int：UIColor]＆＃39;索引类型＆＃39; NSNumber＆＃39;

3 个答案: