如何在 Swift 2 [MapKit] 中从地图中删除注释答案

【问题标题】：How to remove Annotation from Map in Swift 2 [MapKit]如何在 Swift 2 [MapKit] 中从地图中删除注释
【发布时间】：2015-11-17 21:59:42
【问题描述】：

我可以使用“第一个”按钮在 MapView 上添加注释，但我想添加一个新选项，该选项可以使用“第二个”按钮删除注释。添加注释没有问题，但我无法从地图视图中删除它。有人可以帮我吗？

这是我的代码：

class ViewController: UIViewController {

@IBOutlet weak var mapViewOutlet: MKMapView!

var lm = CLLocationManager()

override func viewDidLoad() {
    super.viewDidLoad()


    self.lm.requestAlwaysAuthorization()
    mapViewOutlet.showsUserLocation = true
    mapViewOutlet.userTrackingMode = MKUserTrackingMode.Follow

}

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

// HERE IS FUNCTION ADDANNOTATION

@IBAction func tagMyCar(sender: UIButton) {

    let coordinate = lm.location?.coordinate


    let CarCoordinates = CarAdnotaion(coordinate: coordinate!)

    mapViewOutlet.addAnnotation(CarCoordinates)

    let region = CLCircularRegion(center: coordinate!, radius: 5, identifier: "My Car")

    region.notifyOnEntry = true
    region.notifyOnExit = true

    lm.startMonitoringForRegion(region)

}

// HERE IS FUNCTION REMOVEANNOTATION

@IBAction func removeAnnotationfromMap(sender: AnyObject) {

    let region = CLCircularRegion(center: (lm.location?.coordinate)!, radius: 5, identifier: "Mój samochód")

    self.mapViewOutlet.removeAnnotation(CarAdnotaion(coordinate: (lm.location?.coordinate)!))

    lm.stopMonitoringForRegion(region)

}

}

【问题讨论】：

标签： ios iphone swift mapkit swift2

【解决方案1】：

我认为问题出在这里：

self.mapViewOutlet.removeAnnotation(CarAdnotaion(coordinate: (lm.location?.coordinate)!))

您正在删除您刚刚在此声明中创建的注释。相反，将let CarCoordinates 向上移动（并在开头给它更合理的名称和小写字母）。然后对该对象调用 removeAnnotation。

【讨论】：

【解决方案2】：

我有解决问题的方法。有效！

import UIKit
import CoreLocation
import MapKit

class ViewController: UIViewController {

@IBOutlet weak var mapViewOutlet: MKMapView!

let lm = CLLocationManager()
var carAnnotation: CarAnnotationOnMap?
var region: CLCircularRegion?


override func viewDidLoad() {
    super.viewDidLoad()

    self.lm.requestAlwaysAuthorization()


    mapViewOutlet.userTrackingMode = MKUserTrackingMode.Follow
    mapViewOutlet.showsUserLocation = true

}

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

// ADD ANNOTATION ON MAP

@IBAction func tagMyCar(sender: UIButton) {

    let coordinates = lm.location?.coordinate
    carAnnotation = CarAnnotationOnMap(coordinates: coordinates!)

    region = CLCircularRegion(center: coordinates!, radius: 5, identifier: "My Zone")


    region!.notifyOnEntry = true
    region!.notifyOnExit = true
    self.lm.startMonitoringForRegion(region!)

    mapViewOutlet.addAnnotation(carAnnotation!)

}

// REMOVE ANNOTATION FROM MAP

@IBAction func removePinFromMyCar(sender: AnyObject) {
    self.lm.stopMonitoringForRegion(region!)
    mapViewOutlet.removeAnnotation(carAnnotation!)

}

}

【讨论】：