Trying to detect beacons but failed because isMonitoringAvailable always false - ios

Question

Hello i trying to detect and ranging beacons following by apple's docs article
but in my case CLLocationManager.isMonitoringAvailable(for: CLBeaconRegion.self) always gave me false thus i couldn't start monitoring
Of course i set Privacy for location and Location updates on background mode
this is my codes
func initializeLocationManager(){
locationManager.delegate = self
locationManager.requestAlwaysAuthorization()
locationManager.desiredAccuracy = kCLLocationAccuracyBest
}
func rangeBeacons(){
if CLLocationManager.isMonitoringAvailable(for: CLBeaconRegion.self) {
let region = CLBeaconRegion(proximityUUID: UUID(uuidString: beacons[0].uuid)!, identifier: beacons[0].identifier)
locationManager.startMonitoring(for: region)
}else {
print("CLLocation Monitoring is unavailable")
}
}
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
if status == .authorizedAlways {
rangeBeacons()
}
}
func locationManager(_ manager: CLLocationManager, didEnterRegion region: CLRegion) {
if region is CLBeaconRegion {
// start monitoring
if CLLocationManager.isRangingAvailable() {
locationManager.startRangingBeacons(in: region as! CLBeaconRegion)
}
}
print("didEnter at \(region.identifier)")
}
func locationManager(_ manager: CLLocationManager, didExitRegion region: CLRegion) {
print("didExit at \(region.identifier)")
}
func locationManager(_ manager: CLLocationManager, didRangeBeacons beacons: [CLBeacon], in region: CLBeaconRegion) {
if beacons.count > 0 {
let nearestBeacon = beacons.first!
switch nearestBeacon.proximity {
case .far:
print("far")
break
case .near:
print("near")
break
case .immediate:
print("It's behind yout")
break
case .unknown:
print("unknown")
}
}
}
but if i use locationManager.startRangingBeacons directly instead locationManager.startMonitoring(for: region), it works
but still problem didEnterRegion and didExitRegion are not called
what is the problem in my case
i want to follow exactly same with apple's docs article

Answer 1

It's unclear from the code shown what CLBeaconRegion.self means in context. Try instead using the defined region to see if monitoring is available.
func rangeBeacons(){
let region = CLBeaconRegion(proximityUUID: UUID(uuidString: beacons[0].uuid)!, identifier: beacons[0].identifier)
if CLLocationManager.isMonitoringAvailable(for: region) {
locationManager.startMonitoring(for: region)
}else {
print("CLLocation Monitoring is unavailable")
}
}
In practice, there is no real reason to call isMonitoringAvailable. Just start monitoring without this check. If for some reason it fails, you will get a callback to: locationManager:monitoringDidFailForRegion:withError

Answer 2

I believe the only reason why isMonitoringAvailable can be false for iBeacon (CLBeaconRegion) is when the device you're running the app on doesn't support Bluetooth 4.0.
This includes:
the simulator,
iPhone: 1st-gen, 3G and 3GS,
iPad: 1st-gen and 2nd-gen,
iPod Touch: 1st through 4th gen.
If you're running your app on any device newer than these, then the only remaining thing I can think of is, there's a problem with Bluetooth on your device. In which case, a reboot might help.