I am working on my first swift application for the iPad. Thus far I have a basic mapview with a button in the bottom toolbar, which I would like to refresh and focus onto the users location once clicked.
Currently I have this code:
import UIKit
import MapKit
import CoreLocation
class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
var location: CLLocation!
let locationManager = CLLocationManager()
@IBOutlet weak var mapView: MKMapView!
@IBOutlet weak var refresh: UIBarButtonItem!
@IBAction func refresh(sender: AnyObject) {
let center = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)
let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))
self.mapView.setRegion(region, animated: true)
}
override func viewDidLoad() {
super.viewDidLoad()
self.locationManager.delegate = self
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
self.locationManager.requestWhenInUseAuthorization()
self.locationManager.startUpdatingLocation()
self.mapView.showsUserLocation = true
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// location delegate methods
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = locations.last
let center = CLLocationCoordinate2D(latitude: location!.coordinate.latitude, longitude: location!.coordinate.longitude)
let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 1, longitudeDelta: 1))
self.mapView.setRegion(region, animated: true)
self.locationManager.stopUpdatingLocation()
}
func locationManager(manager: CLLocationManager, didFailWithError error: NSError)
{
print("Error code: " + error.localizedDescription)
}
}
How can I get the refresh button to do this? I really need some help as I am new to Swift / xcode :)
Thank you
As @Orkhan said you can do it in this way.
If you want to do the action you just simple ctrl-drag to viewController and select "Action".
After that you can add code to the handler.
var location: CLLocation!
@IBAction func refreshLocation(sender: AnyObject) {
let center = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)
let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))
self.map.setRegion(region, animated: true)
}
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
self.location = locations.last as CLLocation
}
Try the following 3 line code:
@IBAction func refresh(sender: AnyObject) {
mapView.setCenterCoordinate(mapView.userLocation.coordinate, animated: true)
}
EDIT
Check the following:
Can you see the dot on the left side of the method?
I want see your connections inspector. Refresh button and refresh
method are connected correctly?
You can update your location with this function:
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
let location = locations.last as CLLocation
let center = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)
let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))
self.map.setRegion(region, animated: true)
}
If your target is iOS 8, you need to add the NSLocationAlwaysUsageDescription
key in your Info.plist.
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