iBeaconのアプリを実装させたいのですがエラーが出ます

Question

###前提・実現したいこと
swift初学者です。iBeaconを利用して送信端末、受信端末が５mになると通知が来るアプリを作りたいのですがうまくいきません。
###エラー箇所
switch (CLLocationManager?.authorizationStatus)! {
case .Authorized, .authorizedWhenInUse:
//iBeaconによる領域観測を開始する
print("観測開始")
self.status.text = "Starting Monitor"
self.manager.startRangingBeacons(in: self.region)
case .notDetermined:
print("許可承認")
self.status.text = "Starting Monitor"
//デバイスに許可を促す
let deviceVer = UIDevice.current.systemVersion
//if(UIDevice.currentDevice().systemVersion.substringToIndex(1).toInt() >= 8){
if(Int(deviceVer.substringToIndex(deviceVer.startIndex.advancedBy(1))) >= 8){
self.manager.requestAlwaysAuthorization()
print("OK")
}else{
self.manager.startRangingBeacons(in: self.region)
}
case .restricted, .denied:
//デバイスから拒否状態
print("Restricted")
self.status.text = "Restricted Monitor"
}
}
###エラーメッセージ
switch (CLLocationManager?.authorizationStatus)! {
Use of unresolve identifier 'authorization'とエラーが出ています。

//if(UIDevice.currentDevice().systemVersion.substringToIndex(1).toInt() >= 8){
Value of type 'String' has no member 'subtringToIndex'とエラーが出ています。

###該当のソースコード
import UIKit
import Foundation
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate
@IBOutlet weak var status: UILabel!
@IBOutlet weak var uuid: UILabel!
@IBOutlet weak var major: UILabel!
@IBOutlet weak var minor: UILabel!
@IBOutlet weak var accuracy: UILabel!
@IBOutlet weak var rssi: UILabel!
@IBOutlet weak var distance: UILabel!

    //UUIDからNSUUIDを作成
    //UUIDは送信機側とフォーマットも合わせる
    let proximityUUID = NSUUID(uuidString:"00000000-9367-1001-B000-001C4DCC713D")
    var region  = CLBeaconRegion()
    var manager = CLLocationManager()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        //背景色設定
        //self.view.backgroundColor = UIColor(red:0.125,green:0.698,blue:0.667,alpha:1.0)
        
        //CLBeaconRegionを生成
        region = CLBeaconRegion(proximityUUID:proximityUUID! as UUID,identifier:"EstimoteRegion")
        
        //デリゲートの設定
        manager.delegate = self
        
        /*
         NotDetermined   --  アプリ起動後、位置情報サービスへのアクセスを許可するかまだ選択されていない状態
         Restricted      --  設定 > 一般 > 機能制限により位置情報サービスの利用が制限中
         Denied          --  ユーザーがこのアプリでの位置情報サービスへのアクセスを許可していない
         Authorized      --  位置情報サービスへのアクセスを許可している
         */
        switch (CLLocationManager?.authorizationStatus)! {
        case .Authorized, .authorizedWhenInUse:
            //iBeaconによる領域観測を開始する
            print("観測開始")
            self.status.text = "Starting Monitor"
            self.manager.startRangingBeacons(in: self.region)
        case .notDetermined:
            print("許可承認")
            self.status.text = "Starting Monitor"
            //デバイスに許可を促す
            let deviceVer = UIDevice.current.systemVersion
            //if(UIDevice.currentDevice().systemVersion.substringToIndex(1).toInt() >= 8){
            if(Int(deviceVer.substringToIndex(deviceVer.startIndex.advancedBy(1))) >= 8){
                self.manager.requestAlwaysAuthorization()
                print("OK")
            }else{
                self.manager.startRangingBeacons(in: self.region)
            }
        case .restricted, .denied:
            //デバイスから拒否状態
            print("Restricted")
            self.status.text = "Restricted Monitor"
        }
    }
    /*
     - (void)locationManager:(CLLocationManager *)manager didStartMonitoringForRegion:(CLRegion *)region
     Parameters
     manager : The location manager object reporting the event.
     region  : The region that is being monitored.
     */
    func locationManager(manager: CLLocationManager, didStartMonitoringForRegion region: CLRegion) {
        manager.requestState(for: region)
        self.status.text = "Scanning..."
    }
    
    /*
     - (void)locationManager:(CLLocationManager *)manager didDetermineState:(CLRegionState)state forRegion:(CLRegion *)region
     Parameters
     manager :The location manager object reporting the event.
     state   :The state of the specified region. For a list of possible values, see the CLRegionState type.
     region  :The region whose state was determined.
     */
    func locationManager(manager: CLLocationManager, didDetermineState state: CLRegionState, forRegion inRegion: CLRegion) {
        if (state == .inside) {
            manager.startRangingBeacons(in: region)
        }
    }
    
    /*
     - (void)locationManager:(CLLocationManager *)manager monitoringDidFailForRegion:(CLRegion *)region withError:(NSError *)error
     Parameters
     manager : The location manager object reporting the event.
     region  : The region for which the error occurred.
     error   : An error object containing the error code that indicates why region monitoring failed.
     */
    func locationManager(manager: CLLocationManager, monitoringDidFailForRegion region: CLRegion?, withError error: NSError) {
        print("monitoringDidFailForRegion (error)")
        self.status.text = "Error :("
    }
    
    /*
     - (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
     Parameters
     manager : The location manager object that was unable to retrieve the location.
     error   : The error object containing the reason the location or heading could not be retrieved.
     */
    //通信失敗
    func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {
        print("didFailWithError (error)")
    }
    
    func locationManager(manager: CLLocationManager, didEnterRegion region: CLRegion) {
        manager.startRangingBeacons(in: region as! CLBeaconRegion)
        self.status.text = "Possible Match"
    }
    
    func locationManager(manager: CLLocationManager, didExitRegion region: CLRegion) {
        manager.stopRangingBeacons(in: region as! CLBeaconRegion)
        reset()
    }
    
    /*
     - (void)locationManager:(CLLocationManager *)manager didRangeBeacons:(NSArray *)beacons inRegion:(CLBeaconRegion *)region
     Parameters
     manager : The location manager object reporting the event.
     beacons : An array of CLBeacon objects representing the beacons currently in range. You can use the information in these objects to determine the range of each beacon and its identifying information.
     region  : The region object containing the parameters that were used to locate the beacons
     */
    /*****  NSArray => [CLBeacon] *****/
    func locationManager(manager: CLLocationManager, didRangeBeacons beacons: [CLBeacon], inRegion region: CLBeaconRegion) {
        print(beacons)
        
        if(beacons.count == 0) { return }
        let beacon = beacons[0]
        
        /*
         beaconから取得できるデータ
         proximityUUID   :   regionの識別子
         major           :   識別子１
         minor           :   識別子２
         proximity       :   相対距離
         accuracy        :   精度
         rssi            :   電波強度
         */
        if (beacon.proximity == CLProximity.unknown) {
            self.distance.text = "Unknown Proximity"
            reset()
            return
        } else if (beacon.proximity == CLProximity.immediate) {
            self.distance.text = "Immediate"
        } else if (beacon.proximity == CLProximity.near) {
            self.distance.text = "Near"
        } else if (beacon.proximity == CLProximity.far) {
            self.distance.text = "Far"
        }
        self.status.text   = "OK"
        self.uuid.text     = beacon.proximityUUID.UUIDString
        self.major.text    = "(beacon.major)"
        self.minor.text    = "(beacon.minor)"
        self.accuracy.text = "(beacon.accuracy)"
        self.rssi.text     = "(beacon.rssi)"
    }
    
    func reset(){
        self.status.text   = "none"
        self.uuid.text     = "none"
        self.major.text    = "none"
        self.minor.text    = "none"
        self.accuracy.text = "none"
        self.rssi.text     = "none"
    }0. 
    override func didReceiveMemoryWarning() {```

            super.didReceiveMemoryWarning()
            // Dispose of any resources that can be recreated.
        }
        
}

Comments

[t_obara]

swift初学者とのことで、何らかのコードをコピペして学習する方法もあるかと思いますが、エラー箇所に関してどのように対処して良いのか、調査方法もわからないという状況を鑑みるに、もう少し文法的な部分を把握できる段階になってから取り組まれてはいかがでしょうか。