Compass

We will make a compass app.

Drag icon in to project.

Create new project, import library.

import CoreLocation

Add this line to class declaration.

 CLLocationManagerDelegate

Declare images, 5 label, variables.

let im = UIImage(named: "compass")

var ima: UIImageView!

var de = 0.0

var la:UILabel!

var la2:UILabel!

var la3:UILabel!

var la4:UILabel!

var la5:UILabel!

privatelet locationManager = CLLocationManager()

Initial, set posiotion, set text, add to view inside viewDidLoad.

locationManager.delegate = self

locationManager.desiredAccuracy = kCLLocationAccuracyBest

locationManager.requestWhenInUseAuthorization()

locationManager.requestAlwaysAuthorization()

locationManager.startUpdatingLocation()

locationManager.startUpdatingHeading()

view.backgroundColor = UIColor.whiteColor()

ima = UIImageView(frame: CGRect(x: 5, y: 110, width: 310, height: 315))

ima.image = im

la = UILabel(frame: CGRect(x: 5, y: 50, width: 95, height: 60))

la2 = UILabel(frame: CGRect(x: 55, y: 410, width: 95, height: 20))

la3 = UILabel(frame: CGRect(x: 205, y: 410, width: 95, height: 20))

la4 = UILabel(frame: CGRect(x: 132, y: 410, width: 95, height: 20))

la5 = UILabel(frame: CGRect(x: 292, y: 410, width: 95, height: 20))

la2.text = "Latitude:"

la3.text = "Longitude:"

ima.center = CGPoint(x: view.center.x, y:250)

la.center = CGPoint(x: view.center.x, y:70)

la.textColor=UIColor.blueColor()

la2.textColor=UIColor.orangeColor()

la3.textColor=UIColor.orangeColor()

la4.textColor=UIColor.orangeColor()

la5.textColor=UIColor.orangeColor()

la.font = UIFont(name:"Arial",size:32)

la.sizeToFit()

view.addSubview(ima)

view.addSubview(la)

view.addSubview(la2)

view.addSubview(la3)

view.addSubview(la4)

view.addSubview(la5)

Copy functions to above last close bracket.

func locationManager(manager: CLLocationManager, didUpdateHeading heading: CLHeading) {

de = heading.magneticHeading

la.text = String(round1(de))+gk(de)

UIView.animateWithDuration(0.0, animations: {

self.ima.transform = CGAffineTransformMakeRotation(CGFloat(360-self.de) * CGFloat(M_PI)/180)

        })

    }

func gk(degrees: Double)->String {

var l=""

if(degrees >= 337.5 || degrees <22.5) {

            l = "N"; }

if(degrees >= 22.5&& degrees <67.5) {

            l = "NE"; }

if(degrees >= 67.5&& degrees <112.5) {

            l = "E"; }

if(degrees >= 112.5&& degrees <157.5) {

            l = "SE"; }

if(degrees >= 157.5&& degrees <202.5) {

            l = "S"; }

if(degrees >= 202.5&& degrees <247.5) {

            l = "SW"; }

if(degrees >= 247.5&& degrees <292.5) {

            l = "W"; }

if(degrees >= 292.5&& degrees <337.5) {

            l = "NW"; }

return"°"+l

    }

overridefunc prefersStatusBarHidden() ->Bool {

returntrue

    }

func round1(a:Double)->Double{

let mu = pow(10.0,2.0)

let r=round(a*mu)/mu

return r

    }

func locationManager(manager: CLLocationManager,

                         didChangeAuthorizationStatus status: CLAuthorizationStatus) {

print("Authorization status changed to \(status.rawValue)")

switch status {

case .Authorized, .AuthorizedWhenInUse:

locationManager.startUpdatingLocation()

default:

locationManager.stopUpdatingLocation()

        }

    }

func locationManager(manager: CLLocationManager,

                         didFailWithError error: NSError) {

//    print ("error")

let errorType = error.code == CLError.Denied.rawValue

            ? "Access Denied": "Error \(error.code)"

let alertController = UIAlertController(title: "Location Manager Error",

                                                message: errorType, preferredStyle: .Alert)

let okAction = UIAlertAction(title: "OK", style: .Cancel,

                                     handler: { action in })

        alertController.addAction(okAction)

presentViewController(alertController, animated: true,

                              completion: nil)

    }

func locationManager(manager: CLLocationManager, didUpdateLocations

        locations: [CLLocation]) {

iflet newLocation = locations.last {

let latitudeString = String(format: "%g\u{00B0}",

round1(newLocation.coordinate.latitude))

la4.text = latitudeString

let longitudeString = String(format: "%g\u{00B0}",

round1(newLocation.coordinate.longitude))

la5.text = longitudeString

if newLocation.horizontalAccuracy<0 {

// invalid accuracy

return

            }

if newLocation.horizontalAccuracy>100 ||

                newLocation.verticalAccuracy>50 {

// accuracy radius is so large, we don't want to use it

return

            }

        }

    }

To get location permission, right click to file info.plist, open as, source code, copy these lines to near bottom.

<key>NSLocationWhenInUseUsageDescription</key>

<string>This app requires access to your location</string>

When reopen app, it show an inform like this.

Press Allow. You need a actual device to see compass move.