Creating markers in GoogleMaps - ios

Question

How to create a function for drawing markers on a map from an array of applications received during the operation. That is, the function must be outside the viewDidLoad() ?
If you use a simple function with the following content:
import UIKit
import GoogleMaps
import CoreLocation
class ViewController: UIViewController {
#IBOutlet var mMap: GMSMapView!
let locationManager = CLLocationManager()
let mapInsets = UIEdgeInsets(top: 10.0, left: 0.0, bottom: 100.0, right: 0.0)
override func viewDidLoad() {
super.viewDidLoad()
view = mMap
mMap.padding = mapInsets
mMap.isMyLocationEnabled = true
mMap.settings.compassButton = true
mMap.settings.myLocationButton = true
mMap.settings.scrollGestures = true
mMap.settings.zoomGestures = true
let camera = GMSCameraPosition.camera(withLatitude: myLat, longitude: myLon, zoom: 15.0)
let mMap = GMSMapView.map(withFrame: CGRect.zero, camera: camera)
let buttonDps = UIButton(frame: CGRect(x: 2, y: 520, width: 103, height: 45))
button.backgroundColor = .red
button.setTitle("yes", for: .normal)
button.titleLabel!.font = UIFont.boldSystemFont(ofSize: 19)
button.layer.cornerRadius = 5.0
button.addTarget(self, action: #selector(buttonAct), for:.touchUpInside)
self.view.addSubview(button)
}
func buttonAct(sender: UIButton!) {
let alert = UIAlertController(title:"help", message:"qwerty", preferredStyle:.alert)
alert.addAction(UIAlertAction(title:"OK", style:.default){ action in
self.markercreate()
})
alert.addAction(UIAlertAction(title:"cancel", style:.cancel, handler:nil))
self.present(alert, animated:true, completion:nil)
}
func markercreate(){
let marker2 = GMSMarker()
marker2.position = CLLocationCoordinate2D(latitude: 54.9044200, longitude: 52.3154000)
marker2.title = "Россия"
marker2.snippet = "Москва"
marker2.map = mMap
}
}
then nothing happens (((

Answer 1

Suppose you have a list of latitude, longitude and place name.
Create a loop and inside your loop if you want to show markers then use this.
func createMarker()
{
let lon = Double(longResult as! String)
let lat = Double(latResult as! String)
print("Center_Name: \(centerName)")
print("Longitude: \(longResult)")
print("Latitude: \(latResult)")
let markerResult = GMSMarker()
markerResult.position = CLLocationCoordinate2D(latitude: lat! , longitude: lon!)
markerResult.title = "\(centerName)"
markerResult.map = viewMap
}
The code I have shown is a basic one. With this you can create a marker on your map.

Answer 2

As far as I can analyze,
The code will work fine. Also the marker is added to the map. You just don't see the marker you have added. Move the camera position of the map to marker position so that you can see the marker, i.e.
func markercreate()
{
//Your code...
mMap.camera = GMSCameraPosition.camera(withLatitude: 54.9044200, longitude: 52.3154000, zoom: 15.0) //Add this line to your code
}
I assume you will resolve the 2 mMap variables that you have created as I mentioned in the comment.
Edit:
1. In Storyboard, set the ViewController's view's class to GMSMapView and connect the outlet mMap to it, i.e.
2. Follow the comments in the below code snippet:
override func viewDidLoad()
{
super.viewDidLoad()
//Your code...
view = mMap //Remove this line
mMap.camera = GMSCameraPosition.camera(withLatitude: 54.9044200, longitude: 52.3154000, zoom: 15.0) //Add this line
let camera = GMSCameraPosition.camera(withLatitude: myLat, longitude: myLon, zoom: 15.0) //Remove this line
let mMap = GMSMapView.map(withFrame: CGRect.zero, camera: camera) //Remove this line
//Your code...
}