ios – Black display screen with no warnings when operating code on iPhone

Please may you guys level out the place i am going unsuitable, i’ve cobbled this collectively as my first app on iOS and on the simulator it runs however offers no GPS knowledge obtainable, on an precise telephone its only a black show.

After 4 hours of attempting various things to no avail i am caught.

Undecided what different particulars so as to add.

import UIKit
import CoreLocation
import AVFoundation

class ViewController: UIViewController, CLLocationManagerDelegate {

let locationManager = CLLocationManager()
let debugLabel = UILabel()

override func viewDidLoad() {
    tremendous.viewDidLoad()

    setupUI()
    setupLocationManager()
    startTimer()
}

func setupUI() {
    // Arrange debug label
    debugLabel.body = CGRect(x: 20, y: 100, width: view.body.width - 40, peak: 40)
    debugLabel.textAlignment = .middle
    debugLabel.textColor = .black
    debugLabel.textual content = "No GPS knowledge obtainable"
    view.addSubview(debugLabel)
}

func setupLocationManager() {
    locationManager.delegate = self
    locationManager.requestAlwaysAuthorization()

    // Verify if location companies can be found
    if CLLocationManager.locationServicesEnabled() {
        locationManager.startUpdatingHeading()
    } else {
        displayError(message: "Location companies usually are not enabled. Please allow them in Settings.")
    }
}

func startTimer() {
    Timer.scheduledTimer(timeInterval: 1200, goal: self, selector: #selector(triggerAnnouncement), userInfo: nil, repeats: true)
}

@objc func triggerAnnouncement() {
    locationManager.startUpdatingHeading()
}

func locationManager(_ supervisor: CLLocationManager, didUpdateHeading newHeading: CLHeading) {
    let heading = newHeading.trueHeading
    announceHeading(heading)

    // Replace debug label with GPS knowledge
    if let location = locationManager.location {
        let latitude = location.coordinate.latitude
        let longitude = location.coordinate.longitude
        debugLabel.textual content = "Heading: (heading) degreesnLatitude: (latitude)nLongitude: (longitude)"
    }
}

func announceHeading(_ heading: CLLocationDirection) {
    let synthesizer = AVSpeechSynthesizer()
    let utterance = AVSpeechUtterance(string: "Present heading is (heading) levels")
    synthesizer.converse(utterance)
}

func displayError(message: String) {
    let alert = UIAlertController(title: "Error", message: message, preferredStyle: .alert)
    let okAction = UIAlertAction(title: "OK", type: .default, handler: nil)
    alert.addAction(okAction)
    current(alert, animated: true, completion: nil)
    }
}