iBeacons finding

iBeacon.swift

import CoreLocation

let beaconUUIDs = ["f7826da6-4fa2-4e98-8024-bc5b71e0893e"]

let locationManager = CLLocationManager()
locationManager.delegate = self

for uuid in beaconUUIDs {
    let beaconRegion = CLBeaconRegion(proximityUUID: NSUUID(UUIDString:uuid)!, identifier: uuid)
    manager.startMonitoringForRegion(beaconRegion)
}

public func locationManager(manager: CLLocationManager, didDetermineState state: CLRegionState, 
                            forRegion region: CLRegion) {
    if let region = region as? CLBeaconRegion {
        if state == .Inside {
            manager.startRangingBeaconsInRegion(region)
        } else if state == .Outside {
            manager.stopRangingBeaconsInRegion(region)
            //мы вышли из зоны всех beacons
        }
    }
}

public func locationManager(manager: CLLocationManager, didRangeBeacons beacons: [CLBeacon], 
                            inRegion region: CLBeaconRegion) {
    var sortedBeacons = beacons.filter({ $0.proximity != .Unknown })
    sortedBeacons.sortInPlace({
        let firstBeaconProximity = $0.proximity.rawValue
        let secondBeaconProximity = $1.proximity.rawValue
        return firstBeaconProximity < secondBeaconProximity 
               || (firstBeaconProximity == secondBeaconProximity && $0.accuracy < $1.accuracy)
    })
    //мы находимся ближе всего к sortedBeacons.first
}