使用来自 Firebase 的 UUID 检测 iBeacons

Question

我正在尝试从我的Firebase数据库中接收所有UUID。使用这些UUID，我想搜索这些UUID中的任何一个是否在设备附近。下面是我为实现此目的编写的代码。每当我运行我的程序时，它只检测某些 UUID 而不是所有 UUID。有人可以帮我弄清楚为什么会发生这种情况吗？

提前感谢！！

编辑：我想一个接一个地不断检查信标

我的 JSON 数据库文件

{
"UUID" : {
"Cool Cool" : "E99B856D-2F8A-49F0-A583-E675A86F33BE",
"Sabad's Ipad" : "44837477-B489-4BC7-83A6-D001D7FE0BD0",
"Sweta" : "7D0D9B66-0554-4CCF-A6E4-ADE12325C4F0",
"User 2" : "6D340D8D-005B-4610-A4FA-AA8D9437B8A8"
},
"User Detected" : {
"Sabad's Ipad" : {
"Co-ordinates" : "Latitude: 25.089279174804688   Longitude:55.17439565327509",
"DateTime" : "2020-05-11 17:52:13 +0000",
"UUID" : "A0719C85-E00B-4961-B9D0-7FCADD4ABA21"
}
}
}

我的视图控制器.swift

import Firebase
import UIKit
import CoreLocation
import CoreBluetooth
//Initialise View Controller
class ViewController: UIViewController, CLLocationManagerDelegate, CBPeripheralManagerDelegate{

@IBOutlet weak var distanceReading: UILabel!
var locationManager:CLLocationManager?
var currentDateTime : Date = Date()
var currentDateTime2 : Date = Date()
var uuid = UUID()
let ref = Database.database().reference()
var dataArray = [String]()
var latitude = CLLocationDegrees(0)
var longitude = CLLocationDegrees(0)

override func viewDidLoad() {
super.viewDidLoad()
locationManager = CLLocationManager()
locationManager?.delegate = self
locationManager?.requestAlwaysAuthorization()
view.backgroundColor = .gray
uuid = UUID()
let name = UIDevice.current.name
ref.child("UUID/(name)").setValue("(String(describing: uuid))")
if CLLocationManager.locationServicesEnabled() {
locationManager?.delegate = self
locationManager?.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
locationManager?.startUpdatingLocation()
}
}
//MARK: Detect iBeacon
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
guard let locValue: CLLocationCoordinate2D = manager.location?.coordinate else { return }
latitude = (locValue.latitude)
longitude = (locValue.longitude)
if status == .authorizedAlways {
if CLLocationManager.isMonitoringAvailable(for: CLBeaconRegion.self){
if CLLocationManager.isRangingAvailable() {
startScanning()
}
}
}
}
func startScanning(){
ref.child("UUID").observe(.childAdded) { (snapshot) in
//        ref.child("UUID").observeSingleEvent(of: .childAdded) { (snapshot)
let data = snapshot.value as? String
if let actualPost = data{
self.dataArray.append(actualPost)
//          print(self.dataArray)
_ = self.dataArray.count
//          print(dataCount)
//          for i in 0..<(dataCount)
for i2 in self.dataArray{
//              print(i2)
//                print("Next")
let beaconRegion = CLBeaconRegion(uuid : UUID(uuidString: i2)! , major: 123, minor: 789, identifier: "MyBeaconDetector")
//                print(beaconRegion)
self.locationManager?.startMonitoring(for: beaconRegion)
self.locationManager?.startRangingBeacons(satisfying: beaconRegion.beaconIdentityConstraint)
}
}
}
}
func update(distance:CLProximity){
UIView.animate(withDuration: 0.01 ) {
switch distance{
case .immediate:
self.view.backgroundColor = .blue
self.distanceReading.text = "Right Here"
self.currentDateTime = Date()
print(self.currentDateTime)
case .near:
self.view.backgroundColor = .orange
self.distanceReading.text = "Near"
self.currentDateTime2 = Date()
print(self.currentDateTime2)
case .far:
self.view.backgroundColor = .red
self.distanceReading.text = "Far"
default:
self.view.backgroundColor = .gray
self.distanceReading.text = "UNKNOWN"
}
}
}
func locationManager(_ manager: CLLocationManager, didRange beacons : [CLBeacon], satisfying beaconConstraint: CLBeaconIdentityConstraint) {
let dataCount = UInt32(beacons.count)
//    print(dataCount)
print(beaconConstraint)
//    print(dataCount)
for i in 0...10000{
if let beacon = beacons.randomElement() {
print(beacon)
update(distance: beacon.proximity)
let name = UIDevice.current.name
self.ref.child("User Detected/(name)/DateTime").setValue("(self.currentDateTime)")
self.ref.child("User Detected/(name)/UUID").setValue("(String(describing: self.uuid))")
self.ref.child("User Detected/(name)/DateTime").setValue("(self.currentDateTime)")
self.ref.child("User Detected/(name)/Co-ordinates").setValue("Latitude: (self.latitude)   Longitude:(self.longitude)")
continue
} else{
//            print("Check")
update(distance: .unknown)
}
}
}
}

Answer 1

问题出在这些代码行中：

for i2 in self.dataArray{
let beaconRegion = CLBeaconRegion(uuid : UUID(uuidString: i2)!,
major: 123, minor: 789, 
identifier: "MyBeaconDetector")
self.locationManager?.startMonitoring(for: beaconRegion)
self.locationManager?.startRangingBeacons(satisfying: beaconRegion.beaconIdentityConstraint)

问题是您要为循环中构建的每个区域重用identifier字段。 该字符串应该是唯一的。 因此，您最终要做的是覆盖以前注册的范围/监视区域。

若要修复此问题，请按区域identifier唯一，如下所示：

for i2 in self.dataArray{
let uniqueIdentifier = i2 // adjust as needed to make this unique
let beaconRegion = CLBeaconRegion(uuid : UUID(uuidString: i2)!,
major: 123, minor: 789, 
identifier: uniqueIdentifier)
self.locationManager?.startMonitoring(for: beaconRegion)
self.locationManager?.startRangingBeacons(satisfying: beaconRegion.beaconIdentityConstraint)