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我在添加我的iBeacon代碼以找到兩個設備之間的距離後導航到其他屏幕（onBackButton）時出現錯誤。更換屏幕時發生崩潰 - iBeacon iOS
這裏是我的示例代碼：
import Foundation
import UIKit
import SlideMenuControllerSwift
import CoreLocation
import QuartzCore
import CoreLocation
import CoreBluetooth
class PokemonViewController: UIViewController , CLLocationManagerDelegate, CBPeripheralManagerDelegate{
var beaconRegion: CLBeaconRegion!
var bluetoothPeripheralManager: CBPeripheralManager!
var isBroadcasting = false
var dataDictionary = NSDictionary()
var isSearchingForBeacons = false
var lastFoundBeacon: CLBeacon! = CLBeacon()
var lastProximity: CLProximity! = CLProximity.unknown
var locationManager: CLLocationManager!
var my_uuid : String = ""
var other_uuid : String = ""
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.title = "Find Me"
var image = UIImage(named: "arrow")
image = image?.withRenderingMode(UIImageRenderingMode.alwaysOriginal)
self.navigationItem.leftBarButtonItem = UIBarButtonItem(image: Shared().imageRotatedByDegrees(oldImage: image!, deg: 180), style: UIBarButtonItemStyle.plain, target: self, action: #selector(onBackButton))
navigationController?.navigationBar.barTintColor = UIStyle().hexStringToUIColor("#e2041a")
}
override func viewDidAppear(_ animated: Bool) {
self.navigationController?.navigationBar.titleTextAttributes = [ NSFontAttributeName: UIFont(name: "Avenir Next", size: 20)!]
Pokemon.isPokemon = true
self.bluetoothPeripheralManager = CBPeripheralManager(delegate: self, queue: nil, options: nil)
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.slideMenuController()?.removeLeftGestures()
self.slideMenuController()?.removeRightGestures()
//self.setNavigationBarItem()
let nav = self.navigationController?.navigationBar
nav?.barStyle = UIBarStyle.black
nav?.tintColor = UIColor.white
nav?.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.white]
let url = "\(Webcall().url)getuserdetails?user_id=\(userIdInvite)&token=\(UserDefaults.standard.object(forKey: "user_token") as! String)"
getUserDataRequest(url)
}
override func viewDidDisappear(_ animated: Bool) {
}
override func viewWillDisappear(_ animated: Bool) {
locationManager.stopMonitoring(for: beaconRegion)
locationManager.stopRangingBeacons(in: beaconRegion)
locationManager.stopUpdatingLocation()
isSearchingForBeacons = !isSearchingForBeacons
bluetoothPeripheralManager.stopAdvertising()
isBroadcasting = false
}
func onBackButton() {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let resultViewController = storyboard.instantiateViewController(withIdentifier: "RadarViewController") as! RadarViewController
_ = navigationController?.popViewController(animated: true)
}
}
extension PokemonViewController {
func getUserDataRequest(_ url: String) {
var url = url
print(url)
url = url.replacingOccurrences(of: "+", with: "%2B", options: .literal, range: nil)
//present(Validation().waitAlert(), animated: true, completion: nil)
Shared().showLoaderGif(view: self.view)
_ = URLSession.shared
let urlPath = URL(string: url)
let request = NSMutableURLRequest(url: urlPath!)
request.timeoutInterval = 60
request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringLocalCacheData
request.addValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")
request.httpMethod = "POST"
let dataTask = URLSession.shared.dataTask(with: request as URLRequest,completionHandler: {(data, response, error) -> Void in
if((error) != nil) {
}else {
let statusCode = (response as! HTTPURLResponse).allHeaderFields
_ = statusCode["Connection"]!
_ = NSString(data: data!, encoding:String.Encoding.utf8.rawValue)
let _: NSError?
let jsonResult: AnyObject = try! JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers) as AnyObject
print(jsonResult)
let flag = jsonResult["flag"] as! String
let message = jsonResult["message"] as! String
DispatchQueue.main.async {
Shared().hideLoaderGif(view: self.view)
if flag == "1" {
let data = jsonResult["data"] as? [String: AnyObject]
self.my_uuid = data?["my_udid"]! as! String
self.other_uuid = data?["usr_udid"]! as! String
self.switchBroadcastingState()
}else {
let uiAlert = UIAlertController(title: "Hello \(UserDefaults.standard.object(forKey: "user_name") as! String)", message: message , preferredStyle:.alert)
self.present(uiAlert, animated: true, completion: nil)
uiAlert.addAction(UIAlertAction(title: "Ok", style: .default, handler: { action in}))
}
}
}
})
dataTask.resume()
}
}
//iBeacon
extension PokemonViewController {
func peripheralManagerDidUpdateState(_ peripheral: CBPeripheralManager) {
print("State -> ->", peripheral.state)
switch peripheral.state {
case .poweredOff:
if isBroadcasting {
switchBroadcastingState()
print("Power Off ->->")
}
case .poweredOn:
print("Power On ->->")
case .resetting:
print("resetting ->->")
case .unauthorized:
print("unauthorized ->->")
case .unsupported:
print("unsupported ->->")
default:
print("default ->->")
}
}
func switchBroadcastingState() {
if !isBroadcasting {
if bluetoothPeripheralManager.state == .poweredOn {
print("My UUID: \(self.my_uuid)")
print("Other UUID: \(self.other_uuid)")
/* It prints
My UUID: 1D2E9DF1-7A0E-4299-A755-AE11EBBC2C72
Other UUID: 58B2E595-F4CC-4BAD-8817-F09CD15DB94C*/
let myUuid = UUID(uuidString: "\(self.my_uuid)")
let major: CLBeaconMajorValue = UInt16(Int(1))
let minor: CLBeaconMinorValue = UInt16(Int(1))
beaconRegion = CLBeaconRegion(proximityUUID: myUuid!, major: major, minor: minor, identifier: "com.iMeetUp")
dataDictionary = beaconRegion.peripheralData(withMeasuredPower: nil)
bluetoothPeripheralManager.startAdvertising((dataDictionary as! [String : Any]))
isBroadcasting = true
}
} else {
bluetoothPeripheralManager.stopAdvertising()
isBroadcasting = false
}
self.locationManager = CLLocationManager()
self.locationManager.delegate = self
let otherUuid = UUID(uuidString: "\(self.other_uuid)")
beaconRegion = CLBeaconRegion(proximityUUID: otherUuid!, identifier: "com.iMeetUp")
beaconRegion.notifyOnEntry = true
beaconRegion.notifyOnExit = true
beaconRegion.notifyEntryStateOnDisplay = true
if !isSearchingForBeacons {
locationManager.requestAlwaysAuthorization()
locationManager.startMonitoring(for: beaconRegion)
locationManager.startUpdatingLocation()
} else {
locationManager.stopMonitoring(for: beaconRegion)
locationManager.stopRangingBeacons(in: beaconRegion)
locationManager.stopUpdatingLocation()
}
isSearchingForBeacons = !isSearchingForBeacons
}
func locationManager(_ manager: CLLocationManager!, didStartMonitoringFor region: CLRegion) {
print("Called Called Called 1 -> -> ->")
locationManager.requestState(for: region)
}
func locationManager(_ manager: CLLocationManager!, didDetermineState state: CLRegionState, for region: CLRegion) {
if state == CLRegionState.inside {
print("Called Called Called 2 -> -> ->")
locationManager.startRangingBeacons(in: beaconRegion)
}
else {
print("Called Called Called 3 -> -> ->")
locationManager.stopRangingBeacons(in: beaconRegion)
}
}
func locationManager(_ manager: CLLocationManager!, didEnterRegion region: CLRegion) {
}
func locationManager(_ manager: CLLocationManager!, didExitRegion region: CLRegion) {
}
func locationManager(_ manager: CLLocationManager!, didFailWithError error: Error) {
print("Error -> -> didFailWithError : ", error)
}
func locationManager(_ manager: CLLocationManager!, monitoringDidFailFor region: CLRegion?, withError error: Error) {
print("Error -> -> monitoringDidFailFor : ", error)
}
func locationManager(_ manager: CLLocationManager!, rangingBeaconsDidFailFor region: CLBeaconRegion, withError error: Error) {
print("Error -> -> rangingBeaconsDidFailFor : ", error)
}
func locationManager(_ manager: CLLocationManager, didRangeBeacons beacons: [CLBeacon]!, in region: CLBeaconRegion) {
print("founddddddd")
var shouldHideBeaconDetails = true
if let foundBeacons = beacons {
if foundBeacons.count > 0 {
if let closestBeacon = foundBeacons[0] as? CLBeacon {
print("Found Device: ", foundBeacons)
if closestBeacon != lastFoundBeacon || lastProximity != closestBeacon.proximity {
//lastFoundBeacon = closestBeacon as CLBeacon
//lastProximity = closestBeacon.proximity
var proximityMessage: String!
print("Distance M: ", closestBeacon.accuracy)
switch closestBeacon.proximity {
case CLProximity.immediate:
proximityMessage = "Distance: \(String(format: "%.2f", closestBeacon.accuracy))m"
case CLProximity.near:
proximityMessage = "Distance: \(String(format: "%.2f", closestBeacon.accuracy))m"
case CLProximity.far:
proximityMessage = "Distance: \(String(format: "%.2f", closestBeacon.accuracy))m"
default:
proximityMessage = "Not Found!"
}
shouldHideBeaconDetails = false
//lblBeaconDetails.text = "Beacon Details:\nMajor = " + String(closestBeacon.major.int32Value) + "\nMinor = " + String(closestBeacon.minor.int32Value) + "\nDistance: " + proximityMessage + "\nDistance (m): \(String(format: "%.2f", closestBeacon.accuracy))"
}
}
}
}
}
}
下面是我在Xcode中得到了錯誤的屏幕截圖： 
任何幫助將得到高度讚賞。
你在控制檯上得到了什麼錯誤？ – iDeveloper
什麼都沒有。它直接進入我的AppDelegate.swift文件。 – Dhruv