如何在Swift的MKMapView中用下一个视图控制器的新值替换旧值？

问题描述 投票：1回答：1

我有两个地图视图控制器，在第一个视图控制器中，我正在获取当前位置，并自动填充一些值，并在相关的文本字段中显示。

而在第二个视图控制器中，我正在搜索新的位置，并将其位置值发送到第一个视图控制器，使用 DataEnteredDelegate 现在如何在第一视图控制器中替换当前位置值中的委托方法值。

这里我得到的是第二个视图控制器的值。

func userDidEnterInformation(info: [String]) {
    print("zoom map address viewcontroller data \(info)")
}

Prints: zoom map address viewcontroller data '["560066", "Auto Nagar", "Bangalore"]'

如何替换 560066 在 self.pincodeField.text 和 Auto Nagar 在 self.streetField.text 和 Bangalore 在 self.cityField.text 在第一视图控制器中

第一个视图控制器代码。

class ProfileAddressViewController: UIViewController, CLLocationManagerDelegate, UISearchBarDelegate, DataEnteredDelegate {


@IBOutlet weak var pincodeField: UITextField!
@IBOutlet weak var cityField: UITextField!
@IBOutlet weak var streetField: UITextField!
@IBOutlet weak var storeNoField: UITextField!
@IBOutlet weak var colonyField: UITextField!
@IBOutlet weak var landmarkField: UITextField!

@IBOutlet weak var mapView: MKMapView!
let annotation = MKPointAnnotation()

let locationManager = CLLocationManager()
var latitude: String?
var logitude: String?
override func viewDidLoad() {
    super.viewDidLoad()

    self.locationManager.requestAlwaysAuthorization()
    if CLLocationManager.locationServicesEnabled() {
        locationManager.delegate = self

        locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
        locationManager.startUpdatingLocation()
    }
}

override func viewWillAppear(_ animated: Bool) {
    self.navigationController?.navigationBar.isHidden=true;
    let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.triggerTouchAction(_:)))
    mapView.addGestureRecognizer(tapGesture)
}
@objc func triggerTouchAction(_ sender: UITapGestureRecognizer) {
    print("Please Help!")

    let viewController = self.storyboard?.instantiateViewController(withIdentifier: "NewZoomAddressViewController") as! NewZoomAddressViewController;
        viewController.delegate = self

    viewController.zipName = self.pincodeField.text
    viewController.sublocalityName = self.colonyField.text
    viewController.localityName = self.cityField.text
        self.navigationController?.pushViewController(viewController, animated: true);
}

func userDidEnterInformation(info: [String]) {
    print("zoom map address viewcontroller data \(info)")
}
@IBAction func submitButtonClicked(_ sender: UIButton) {
    self.view.endEditing(true)
        let viewController = self.storyboard?.instantiateViewController(withIdentifier: "NewZoomAddressViewController") as! NewZoomAddressViewController;
        self.navigationController?.pushViewController(viewController, animated: true);
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
    print(error)
}

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    guard let _: CLLocationCoordinate2D = manager.location?.coordinate else { return }

    let userLocation :CLLocation = locations[0] as CLLocation
    latitude = "\(userLocation.coordinate.latitude)"
    logitude = "\(userLocation.coordinate.longitude)"
    let geocoder = CLGeocoder()
    geocoder.reverseGeocodeLocation(userLocation) { (placemarks, error) in
        if (error != nil){
            print("error in reverseGeocode")
        }
        let placemark = placemarks! as [CLPlacemark]

        if placemark.count>0{
            let placemark = placemarks![0]
            print(placemark.administrativeArea!)
            print(placemark.country!)
            let placemarkDictonary: NSDictionary=placemark.addressDictionary as! NSDictionary
            self.pincodeField.text=placemarkDictonary["ZIP"] as? String
            self.cityField.text=placemarkDictonary["City"] as? String
            self.streetField.text=placemarkDictonary["Street"] as? String
            self.colonyField.text=placemarkDictonary["SubLocality"] as? String
            self.landmarkField.text=placemarkDictonary["SubThoroughfare"] as? String
        }
    }

    let center = CLLocationCoordinate2D(latitude: userLocation.coordinate.latitude, longitude: userLocation.coordinate.longitude)
    let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))
    mapView.setRegion(region, animated: true)
    // Drop a pin at user's Current Location
    let myAnnotation: MKPointAnnotation = MKPointAnnotation()
    myAnnotation.coordinate = CLLocationCoordinate2DMake(userLocation.coordinate.latitude, userLocation.coordinate.longitude);
    myAnnotation.title = "Current location"
    mapView.addAnnotation(myAnnotation)
    locationManager.stopUpdatingLocation()
}
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
    switch status {
    case .notDetermined:
        print("User still thinking")
    case .denied:
        print("User hates you")
    case .authorizedWhenInUse:
        locationManager.stopUpdatingLocation()
    case .authorizedAlways:
        locationManager.startUpdatingLocation()
    case .restricted:
        print("User dislikes you")
    }
}
}

下一个视图控制器代码：

protocol DataEnteredDelegate: class {
func userDidEnterInformation(info: [String])
}
class NewZoomAddressViewController: UIViewController {
weak var delegate: DataEnteredDelegate? = nil
var userModel : ProfileModel?

var zipName: String?
var localityName: String?
var sublocalityName: String?

@IBOutlet weak var mapView: MKMapView!
@IBOutlet weak var addressLabel: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()
    print("in Zoom map VC")
    mapView.delegate = self
    addressLabel.text = "\(self.sublocalityName!) \(localityName!) \(self.zipName!)"
}

@IBAction func confirmBtn(_ sender: Any) {
    delegate?.userDidEnterInformation(info: [zipName!,sublocalityName!, localityName!])
    self.navigationController?.popViewController(animated: true)
}
swift uiviewcontroller delegates uitextfield mkmapview
1个回答
1
投票

你几乎是在那里。只需在你的文本字段中设置值 userDidEnterInformation(:) func。

func userDidEnterInformation(info: [String]) {
   self.pincodeField.text = info[0]
   self.streetField.text = info[1]
   self.cityField.text = info[2]
}

但是，用数字来访问String数组的下标可能会导致错误，我建议你采用以下方法。

  1. 你应该为你的返回信息定义一个类似于模型的东西，而不是使用一个String数组。我建议你在某个地方添加以下结构。
struct DataEnteredModel {
   let pinCode: String
   let streetField: String
   let cityField: String
}

  1. 把你的委托方法中的函数类型从... func userDidEnterInformation(info: [String]) 到 func userDidEnterInformation(info: DataEnteredModel)

  2. 在 confirmBtn(_:9，这样调用委托函数。

@IBAction func confirmBtn(_ sender: Any) {
    guard
        let zipName = zipName,
        let sublocalityName = sublocalityName,
        let localityName = localityName 
        else { return }
    let enteredData = DataEnteredModel(pinCode: zipName, streetField: sublocalityName, cityField: localityName)
    delegate?.userDidEnterInformation(info: enteredData)
}
  1. 最后，在你的 userDidEnterInformation 方法中 ProfileAddressViewController 你要做的。
func userDidEnterInformation(info: DataEnteredModel) {
    self.pincodeField.text = info.pinCode
    self.streetField.text = info.streetField
    self.cityField.text = info.cityField
}

应该就是这样了，如果有什么问题，随时可以问！

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