gistfile1.swift

import UIKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {
    
    @IBOutlet var distanceReading: UILabel!
    
    let locationManager = CLLocationManager()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        locationManager.delegate = self
        locationManager.requestAlwaysAuthorization()
        
        view.backgroundColor = UIColor.grayColor()
        
        startScanning()
    }
    
    func startScanning() {
        let uuid = NSUUID(UUIDString: "B9407F30-F5F8-466E-AFF9-25556B57FE6D")
        let beaconRegion = CLBeaconRegion(proximityUUID: uuid, major: 48347, minor: 55103, identifier: "Table1")
        
        locationManager.startMonitoringForRegion(beaconRegion)
        locationManager.startRangingBeaconsInRegion(beaconRegion)
    }
    
    func updateDistance(distance: CLLocationAccuracy) {
        UIView.animateWithDuration(0.8) { [unowned self] in
            switch distance {
                
            case 1.1...4:
                self.view.backgroundColor = UIColor.orangeColor()
                self.distanceReading.text = "BYE BEACON!"
                
            case 0...1.1:
                self.view.backgroundColor = UIColor.greenColor()
                self.distanceReading.text = "HI BEACON!"
                
            default:
                self.view.backgroundColor = UIColor.orangeColor()
                self.distanceReading.text = "BYE BEACON!"
            }
        }
    }
    
    func locationManager(manager: CLLocationManager!, didRangeBeacons beacons: [AnyObject]!, inRegion region: CLBeaconRegion!) {
        if beacons.count > 0 {
            let beacon = beacons[0] as! CLBeacon
            updateDistance(beacon.accuracy)
        } else {
            updateDistance(3)
        }
    }
    
    func locationManager(manager: CLLocationManager!, didExitRegion region: CLRegion!) {
        println("You quit the region")
    }
    
    func locationManager(manager: CLLocationManager!, didEnterRegion region: CLRegion!) {
        println("You enter the region")
    }
}