Question

我有自己的代码，因此每次用户点击按钮时都会在地图上添加注释，但当用户关闭应用时，注释会消失。即使用户关闭应用程序，如何使注释保留在地图上？以下是我的代码：

import UIKit
import CoreLocation
import MapKit

class UpdateCar: UIViewController, CLLocationManagerDelegate {

@IBOutlet weak var mapView: MKMapView!

@IBOutlet weak var lblLocation: UILabel!

var locationManager = CLLocationManager()

var myPosition = CLLocationCoordinate2D()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    locationManager.delegate = self
    locationManager.requestWhenInUseAuthorization()
    locationManager.startUpdatingLocation()

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func locationManager(manager: CLLocationManager!, didUpdateToLocation newLocation: CLLocation!, fromLocation oldLocation: CLLocation!) {

    println("Updating Car Location \(newLocation.coordinate.latitude) , \(newLocation.coordinate.longitude) ")

    myPosition = newLocation.coordinate

    locationManager.stopUpdatingLocation()

    lblLocation.text = "\(newLocation.coordinate.latitude) , \(newLocation.coordinate.longitude)"
}

@IBAction func findUserLocationAndDropPin(sender: UIButton) {
    var userLocationCoordinates = CLLocationCoordinate2DMake(locationManager.location.coordinate.latitude, locationManager.location.coordinate.longitude)
    var pinForUserLocation = MKPointAnnotation()
    pinForUserLocation.coordinate = userLocationCoordinates
    mapView.addAnnotation(pinForUserLocation)
    mapView.showAnnotations([pinForUserLocation], animated: true)
    }

}

Answer 1

您必须将其保存在持久存储中。

几个选项：

CoreData，保存数据的本地方式，推荐，不太容易
NSUserDefaults，通常被认为是小东西，也是原生的，不推荐，虽然很容易
另一个用于管理持久性商店的API，如Realm（类似于CoreData，更容易但不是原生的）

如何保存注释？

1 个答案: