我一直在使用Swift创建Beacon感应应用程序的指南,但自从更新Xcode并将代码更新为Swift 3.0后,我收到了一个致命错误。Swift Beacon目前无法使用Swift 3.0
通过功能我认为有startScanning函数的问题,当它触发时,我得到致命的错误消息。
在什么可以帮助任何提示将不胜感激:
import UIKit
import CoreLocation
class ViewController: UIViewController, CLLocationManagerDelegate {
@IBOutlet weak var distanceLabel: UILabel!
var locationManager: CLLocationManager!
override func viewDidLoad() {
super.viewDidLoad()
locationManager = CLLocationManager()
locationManager.delegate = self
locationManager.requestAlwaysAuthorization()
view.backgroundColor = UIColor.gray
print("did load")
}
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
if status == CLAuthorizationStatus.authorizedAlways{
print("status authorized")
if CLLocationManager.isMonitoringAvailable(for: CLBeaconRegion.self){
print("is monitoring")
if CLLocationManager.isRangingAvailable() {
print("scanning")
startScanning()
}
}
}
}
func startScanning() {
print("start Scanning")
let uuid = NSUUID(uuidString: "695e5f08824c785cadc72e1dde23be04")
let beaconRegion = CLBeaconRegion(proximityUUID: uuid as! UUID, identifier: "MyBeacon")
locationManager.startMonitoring(for: beaconRegion)
locationManager.startRangingBeacons(in: beaconRegion)
}
func updateDistance(distance: CLProximity){
UIView.animate(withDuration: 1) { [unowned self] in
switch distance {
case .unknown:
self.view.backgroundColor = UIColor.gray
self.distanceLabel.text = "UNKNOWN"
print("distance Unknown")
case .far:
self.view.backgroundColor = UIColor.blue
self.distanceLabel.text = "FAR"
print("distance Far")
case .near:
self.view.backgroundColor = UIColor.orange
self.distanceLabel.text = "NEAR"
print("distance Near")
case .immediate:
self.view.backgroundColor = UIColor.red
self.distanceLabel.text = "BOOM!"
print("distance Immediate")
}
}
}
func locationManager(_ manager: CLLocationManager, didRangeBeacons beacons: [CLBeacon], in region: CLBeaconRegion) {
if beacons.count > 0 {
let beacon = beacons.first! as CLBeacon
updateDistance(distance: beacon.proximity)
print("found more than one beacon")
} else {
updateDistance(distance: .unknown)
print("found only one beacon")
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
什么是错误信息? – davidgyoung
致命错误:意外发现零,同时展开一个可选值 2016-09-27 17:27:35.045701第22项[3211:825691]致命错误:意外发现零,同时解包可选值 –