ios - 按下完成按钮时如何添加标记？

Question

好的，所以我想在单击完成按钮时添加一个标记。当我单击 AddPinPointVC 中的完成按钮时，我想将当前位置标记添加到 MapVC 类。我需要做什么才能做到这一点？

相关代码如下:

MapsVC

class MapsVC: UIViewController {

weak var googleMaps: GMSMapView!

var locationManager = CLLocationManager()
var currentLocation: CLLocation?
var placesClient: GMSPlacesClient!
var zoomLevel: Float = 15.0

override func viewDidLoad() {
    super.viewDidLoad()

let camera = GMSCameraPosition.camera(withLatitude: 39.9533, longitude: -75.1593, zoom: 15.0)
    let mapView = GMSMapView.map(withFrame: CGRect.zero, camera: camera)
    mapView.isMyLocationEnabled = true
    mapView.settings.myLocationButton = true
    self.view = mapView

locationManager = CLLocationManager()
    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    locationManager.requestAlwaysAuthorization()
    locationManager.distanceFilter = 50
    locationManager.startUpdatingLocation()
    locationManager.delegate = self as? CLLocationManagerDelegate
    placesClient = GMSPlacesClient.shared()

if( CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedWhenInUse ||
        CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedAlways){
        currentLocation = locationManager.location
    }
}

static var latitude: CLLocationDegrees?
}

AddPinPointVC

class AddPinPointVC: UIViewController, UICollectionViewDelegateFlowLayout,UIPickerViewDelegate, UIPickerViewDataSource {

var pickerdata: [String] = [String]()
override func viewDidLoad() {
    super.viewDidLoad()

    navigationItem.leftBarButtonItem = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(handleCancel))

    navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(handleCancel))

//function for cancel button
func handleCancel() { dismiss(animated: true, completion: nil) }

func handleDone(){
    dismiss(animated: true, completion: nil)
    let userMarker = GMSMarker()
    userMarker.position = CLLocationCoordinate2D(latitude: CLLocationDegrees, longitude: CLLocationDegrees)
//        userMarker.title = typeOfPlaces[row]
    userMarker.snippet = ""
 }
}

如果有任何问题，请告诉我!谢谢。

Answer 1

您应该为此创建一个委托(delegate)，并在按下“完成”按钮时触发一个函数。

协议(protocol)

protocol AddPinPointDelegate: class {
    func addPinPointWillDismiss(_ marker: GMSMarker)
}

MapsVC

class MapsVC: UIViewController, AddPinPointDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()

        let camera = GMSCameraPosition.camera(withLatitude: 39.9533, longitude: -75.1593, zoom: 15.0)
        mapView = GMSMapView.map(withFrame: CGRect.zero, camera: camera)

        [...]
    }

    [...]

    var mapView: GMSMapView!

    //assuming you open AddPinPointVC via a segue
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "presentAddPinPoint" { //the identifier you gave for the segue
            (segue.destination as! AddPinPointVC).delegate = self
        }
    }

    func addPinPointWillDismiss(_ marker: GMSMarker) {
        marker.map = mapView
    }
}

AddPinPointVC

class AddPinPointVC: UIViewController, UICollectionViewDelegateFlowLayout, UIPickerViewDelegate, UIPickerViewDataSource {
    [...]

    weak var delegate: AddPinPointDelegate?

    func handleDone() {
        let userMarker = GMSMarker()
        userMarker.position = CLLocationCoordinate2D(latitude: CLLocationDegrees, longitude: CLLocationDegrees)
        //userMarker.title = typeOfPlaces[row]
        userMarker.snippet = ""
        delegate?.addPinPointWillDismiss(userMarker)

        dismiss(animated: true)
    }
}