I'm having trouble understanding how to trigger a view controller when someone taps on an an MKAnnotation with MapKit. I created a View Controller and a segue, gave it a custom ID and added this code:
class ViewController: UIViewController, MKMapViewDelegate {
#IBOutlet weak var MapViewUI: MKMapView!
private func mapView(_ mapView: MKMapView, didSelect view: MKAnnotation) {
self.performSegue(withIdentifier: "ShowClientController", sender: nil);
}
override func viewDidLoad() {
let aClient = Client(title: "Excavators", coordinate: CLLocationCoordinate2D(latitude: 0.0236, longitude: 37.9062), info:"A guy");
MapViewUI.addAnnotation(aClient)
super.viewDidLoad()
}}
And this is the Client class in case you were wondering:
class Client: NSObject, MKAnnotation {
var title: String?;
var coordinate: CLLocationCoordinate2D;
var info: String;
init(title: String, coordinate: CLLocationCoordinate2D, info: String){
self.title = title;
self.coordinate = coordinate;
self.info = info;
}
}
What am I not getting? If anyone can shed some light on this I'd be very grateful. Thank you all.
Related
I have two Controller which is Map and BottomSheet.
Once i click marker in Map I want to change UIlabel text.
BottomsheetController.swift
var Data : [DataClass] = []
class BottomSheetViewController : UIViewController{
#IBOutlet weak var Id: UILabel!
func getid(id : String?){
let kick = id
self.Id.text = kick
}
}
MapViewController.swift
class MapViewController: UIViewController ,GMUClusterManagerDelegate{
#IBOutlet weak var mapView: GMSMapView!
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
addBottomSheetView()
}
// MARK: Click marker
func mapView(_ mapView: GMSMapView, didTap marker: GMSMarker) -> Bool {
if let poiitem = marker.userData as? POIItem {
let bvc = BottomSheetViewController()
bvc.getimei(imei: Data[0].id)
}
return true
}
}
it keeps saying Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value
Just use segue for passing data between two controller
performSegue(idnitfierName,sender)
And than,
perform(){
let vc = segue.destination as! MapViewController
vc.variableName = variable That you have to pass
}
I'm developing an OSX app.
I've subclassed a MKAnnotation:
import Foundation
import MapKit
class LocationAnnotation: NSObject, MKAnnotation {
var image: NSImage?
var title: String?
var coordinate: CLLocationCoordinate2D
init(image anImage: NSImage?, title aTitle: String, coordinate aCoordinate: CLLocationCoordinate2D) {
self.image = anImage
self.title = aTitle
self.coordinate = aCoordinate
}
}
In my NSViewController subclass, I've added a MKMapViewDelegate and in Interface Builder I've added a MKMapView and set its delegate to NSViewController.
To find out what's wrong, I'm adding three locations in my ViewDidLoad method, into an array. I'm adding those annotations to my map in ViewDidAppear. I plan to move that to a background thread when I figure out what's wrong.
import Cocoa
import MapKit
class ShowLocationsViewController: NSViewController, MKMapViewDelegate {
#IBOutlet var locationMap: MKMapView!
private var myLocationArray: [LocationAnnotation] = []
private var myRegion: MKCoordinateRegion!
//#MARK: - UIViewController
override func viewDidLoad() {
super.viewDidLoad()
myLocationArray = []
myRegion = nil
let locLondon = LocationAnnotation(image: nil, title: "London", coordinate: CLLocationCoordinate2DMake(51.522617, -0.139371))
let locWembley = LocationAnnotation(image: nil, title: "Wembley", coordinate: CLLocationCoordinate2DMake(51.555909, -0.279600))
let locGreenwich = LocationAnnotation(image: nil, title: "Greenwich", coordinate: CLLocationCoordinate2DMake(51.476572, -0.001596))
myLocationArray.append(locLondon)
myLocationArray.append(locWembley)
myLocationArray.append(locGreenwich)
myRegion = MKCoordinateRegion.init(center: locLondon.coordinate, span: MKCoordinateSpanMake(0.20, 0.20)) // 20km span
}
override func viewDidAppear() {
locationMap.addAnnotations(myLocationArray)
locationMap.setRegion(myRegion, animated: true)
}
}
When using delegate's method viewFor annotation: I print out the title of each annotation in a log and all three of them are listed. In another delegate's method didAdd I'm printing out the number of annotations of my map in a log and it prints out three. But on my map, there are no annotations displayed. I tried panning and zooming with no success. Region gets properly set and displayed though.
//#MARK: - MKMapViewDelegate
func mapView(_ mapView: MKMapView, didAdd views: [MKAnnotationView]) {
print(locationMap.annotations.count, views.count)
}
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
if annotation is LocationAnnotation {
let annotationIdentifier = "Location"
var annotationView = locationMap.dequeueReusableAnnotationView(withIdentifier: annotationIdentifier) as! MKPinAnnotationView?
if annotationView == nil {
annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: annotationIdentifier)
}
annotationView!.canShowCallout = true
print(annotationView!.annotation!.title ?? "no view")
return annotationView
} else {
print("no annotation")
return nil
}
}
When I try the same code in an iOS app, everything works. I assume there is nothing wrong with my delegate because methods are properly called.
I would appreciate any help you can give me.
I figured out the problem, the way the window is being called.
I created a variable mainWindowController in my AppDelegate, then I subclassed my main NSViewController so that I could hook up AppDelegate to it.
let appDelegate = NSApp.delegate as! AppDelegate
appDelegate.mainWindowController = self
Afterwards I used this code to call my window which was errornous:
let mapViewController = mainWindowController?.storyboard?.instantiateController(withIdentifier: NSStoryboard.SceneIdentifier.init(rawValue: "ShowLocationsID")) as! ShowLocationsViewController
mainWindowController?.contentViewController?.presentViewControllerAsModalWindow(mapViewController)
I changed that in a way that I created a segue in my storyboard and called the following code which worked and my pins did show:
performSegue(withIdentifier: NSStoryboardSegue.Identifier(rawValue: "ShowLocations"), sender: self)
I am making a Swift application that uses MKPointAnnotations, and I recently ran into an issue where I needed to store metadata in my annotations, so I created the custom class below:
class BRETTFAnnotation: MKPointAnnotation {
var tag: Int64
var name: String
init(lat : Double, lon:Double, t : Int64, n: String) {
self.tag = t
self.name = n
super.init()
self.coordinate = CLLocationCoordinate2D(latitude: lat, longitude: lon)
}
}
My MKAnnotationView viewfor MKAnnotation method is shown below:
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
let newAnnotation = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "reuse")
newAnnotation.canShowCallout = true
let right = self.button(title: "Yes")
right?.addTarget(self, action: #selector(clickedToConfirmNewPoint), for: .touchUpInside)
newAnnotation.rightCalloutAccessoryView = right
let left = self.button(title: "No")
left?.addTarget(self, action: #selector(clickedToCancelNewPoint), for: .touchUpInside)
newAnnotation.leftCalloutAccessoryView = left
return newAnnotation
}
The problem I am running into is when ever I click on my custom BRETTFAnnotation (which I add to my MKMapView) nothing happens. When I was just using the MKPointAnnotation (instead of the BRETTFAnnotation) when I clicked on the map the two buttons on the MKAnnotationView would show. I am trying to get the MKPinAnnotationView to show on touch using my BRETTFAnnotation instead of the MKPointAnnotation.
How can I continue to use my custom annotation and show the callout when the user clicks on the annotation at the same time?
Edit 1: Since it is probably useful the code below is how I make the annotation and add it to the mapView.
let location = gestureRecognizer.location(in: mapView)
let coordinate = mapView.convert(location,toCoordinateFrom: mapView)
print("adding lat,long \(coordinate.latitude),\(coordinate.longitude)")
lastPoint = BRETTFAnnotation(lat: coordinate.latitude, lon: coordinate.longitude, t: 1, n: "")
let annotationView = MKPinAnnotationView(annotation: lastPoint, reuseIdentifier: "reuse")
mapView.addAnnotation(lastPoint)
I fix this problem by making my BRETTFAnnotation a subclass of NSObject and MKAnnotation instead of MKPointAnnotation. Doing this allowed my custom class to receive user interaction and show the callouts.
When you use your own MKAnnoation you can handle your actions in didSelect. Just implement the following code.
func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) {
if let yourAnnotation = view.annotation as? BRETTFAnnotation {
//handle your meta data or/and show UIViews or whatever
}
}
with
func mapView(_ mapView: MKMapView, didDeselect view: MKAnnotationView) {
//getting called when you tap on map or on another annotation (not the selected annotation before)
//hide UIViews or do whatever you want
}
That does work for me:
class ViewController: UIViewController, MKMapViewDelegate {
func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) {
print("didSelect")
if let annoation = view.annotation as? MyAnnoation {
print("metatag \(annoation.metaTag)")
}
}
func mapView(_ mapView: MKMapView, didDeselect view: MKAnnotationView) {
print("didDeselect")
}
override func viewDidLoad() {
super.viewDidLoad()
mapView.delegate = self
let annotation = MyAnnoation(n: "name", m: "metaTag")
annotation.coordinate = CLLocationCoordinate2D(latitude: 50.0, longitude: 8.0)
mapView.addAnnotation(annotation)
}
}
class MyAnnoation: MKPointAnnotation {
var name: String?
var metaTag: String?
init(n: String, m: String) {
self.name = n
self.metaTag = m
}
}
I am trying to pass the data of user-input coordinates from one VC to another using Notifications. When I run the code, it does not add an annotation onto the MapView, so I have a hunch I may have not set up the notification to send with the inputted coordinates properly, but I am not sure where I have went wrong.
Class file that takes the input of coordinates:
import UIKit
import CoreLocation
var locations: [Dictionary<String, Any>] = [] // here I initialize my empty array of locations
class OtherVC: UIViewController {
#IBOutlet weak var latitudeField: UITextField!
#IBOutlet weak var longitudeField: UITextField!
#IBOutlet weak var titleTextField: UITextField!
var coordinates = [CLLocationCoordinate2D]()
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func addToMap(_ sender: Any) {
let lat = latitudeField.text!
let long = longitudeField.text!
let title = titleTextField.text!
var location: [String: Any] = ["title": title, "latitude": lat, "longitude": long]
locations.append(location)
NotificationCenter.default.post(name: NSNotification.Name("MapViewController.coordinate.updated"), object: locations, userInfo: nil)
}
}
Class file that receives notification and places annotation:
import UIKit
import MapKit
class MapViewController: UIViewController, MKMapViewDelegate {
#IBOutlet weak var mapView: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
mapView.delegate = self
}
func add(notification: NSNotification) {
let dict = notification.object as! NSDictionary
// takes the coordinates from the notification and converts such that the map can interpret them
let momentaryLat = (dict["latitude"] as! NSString).doubleValue
let momentaryLong = (dict["longitude"] as! NSString).doubleValue
let annotation = MKPointAnnotation()
annotation.title = dict["title"] as? String
annotation.coordinate = CLLocationCoordinate2D(latitude: momentaryLat as CLLocationDegrees, longitude: momentaryLong as CLLocationDegrees)
mapView.addAnnotation(annotation)
self.mapView.centerCoordinate = annotation.coordinate
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
let identifier = "pinAnnotation"
var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier) as? MKPinAnnotationView
if annotationView == nil {
annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
annotationView?.canShowCallout = true
}
annotationView?.annotation = annotation
return annotationView
}
}
It's the same as the Objective-C API, but uses Swift's syntax.
NSNotificationCenter.defaultCenter().addObserver(
self,
selector: #selector(batteryLevelChanged),
name: UIDeviceBatteryLevelDidChangeNotification,
object: nil)
Or in Swift 3:
NotificationCenter.default.addObserver(
self,
selector: #selector(self.batteryLevelChanged),
name: .UIDeviceBatteryLevelDidChange,
object: nil)
If your observer does not inherit from an Objective-C object, you must prefix your method with #objc in order to use it as a selector.
#objc func batteryLevelChanged(notification: NSNotification){
//do stuff
}
Register obeserver to receive notification in your MapViewController
override func viewDidLoad() {
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(self.add(_:)), name: NSNotification.Name("MapViewController.coordinate.updated"), object: nil)
}
Also you can send data using userInfo property of NSNotification or send using custom object.
func add(_ notification: NSNotification) {
...
}
see pass data using nsnotificationcenter
I am trying to construct a Map App that can receive user inputs of latitude and longitude coordinates that when entered, will place a pin on a map in a different tab. My FirstVC consists of a button "Add Locations" that segues to OtherVC which the user can input the coordinates. SecondVC consists of the MapView. My initial idea is to have a specific array of coordinates, and any new coordinates will be appended to this array. The execution is where I am lacking, because I am not sure how to transfer this array to the MapView. Here is what I have so far:
For the input of coordinates:
import UIKit
import CoreLocation
class OtherVC: UIViewController {
#IBOutlet weak var latitudeField: UITextField!
#IBOutlet weak var longitudeField: UITextField!
var coordinates = [CLLocationCoordinate2D]()
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func addToMap(_ sender: Any) {
let lat = Double(latitudeField.text!)
let long = Double(longitudeField.text!)
self.coordinates.append(CLLocationCoordinate2D(latitude: lat!, longitude: long!))
}
}
For the MapView:
import UIKit
import MapKit
class MapViewController: UIViewController, MKMapViewDelegate {
#IBOutlet weak var mapView: MKMapView!
var coordinates = [CLLocationCoordinate2D]() {
didSet {
// Update the pins
// Since it doesn't check for which coordinates are new, it you go back to
// the first view controller and add more coordinates, the old coordinates
// will get a duplicate set of pins
for (index, coordinate) in self.coordinates.enumerated() {
let annotation = MKPointAnnotation()
annotation.coordinate = coordinate
annotation.title = "Location \(index)"
mapView.addAnnotation(annotation)
}
}
}
override func viewDidLoad() {
super.viewDidLoad()
mapView.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
let identifier = "pinAnnotation"
var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier) as? MKPinAnnotationView
if annotationView == nil {
annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
annotationView?.canShowCallout = true
}
annotationView?.annotation = annotation
return annotationView
}
}
I think you need is get your second ViewController MapViewController from your tabBarController and then pass the coordinates array, so in your addToMap Action replace with this
#IBAction func addToMap(_ sender: Any) {
let lat = Double(latitudeField.text!)
let long = Double(longitudeField.text!)
self.coordinates.append(CLLocationCoordinate2D(latitude: lat!, longitude: long!))
//here we pass the coordinate array to mapViewController
if let mapViewController = self.tabBarController?.viewControllers?[1] as? MapViewController
{
mapViewController.coordinates = self.coordinates
}
}
You need also add a navigation controller, like in the picture
I hope this helps you
Generally speaking I only use the method of directly passing the data from one ViewController to the next if there is a parent child relationship and I can do it in prepareForSegue or in and unwind (child to parent). Otherwise I think its better to use the publisher subscriber model with Notification. When your coordinate changes you post a Notification:
NotificationCenter.default.post(name: NSNotification.Name("MapViewController.coordinate.updated"), object: self, userInfo: nil)
Now anyone who cares about MapViewController's coordinates changing can listen:
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(coordinateUpdated), name: NSNotification.Name("coordinate.updated"), object: nil)
}
deinit {
NotificationCenter.default.removeObserver(self)
}
#objc private func coordinateUpdated( notification: Notification) {
if let source = notification.object as? MapViewController {
print(source.coordinates)
}
}
This makes the views loosely coupled and MapViewController doesn't need to care about who needs to be updated; the subscribers are responsible for registering themselves.