Ios 通过Popover使用按钮重置地图针脚

我正在制作一个小地图应用程序。我想能够重置引脚（内存），用户已放弃。我希望通过一个“重置记忆”按钮完成此操作，该按钮通过Popover显示：

NSNotificationCenter.defaultCenter().addObserverForName("memoriesUpdated", object: nil, queue: nil) { [weak self] (n) -> Void in
    // remove existing annotations
    if let annotations = self?.placesMap.annotations {
         self?.placesMap.removeAnnotations(annotations)
    }

    // add new annotations (if any)
    if NSUserDefaults.standardUserDefaults().objectForKey("locationArray") != nil {
        for dictionary in NSUserDefaults.standardUserDefaults().objectForKey("locationArray") as! [[String:Double]]{
            let center = CLLocationCoordinate2D(latitude: dictionary["latitude"]!, longitude: dictionary["longitude"]!)
            let annotation = MKPointAnnotation()
            annotation.coordinate = center
            self?.placesMap?.addAnnotation(annotation)
        }
    }
}

NSNotificationCenter.defaultCenter().addObserverForName("memoriesUpdated", object: nil, queue: nil) { [weak self] (n) -> Void in
    // remove existing annotations
    if let annotations = self?.placesMap.annotations {
         self?.placesMap.removeAnnotations(annotations)
    }

    // add new annotations (if any)
    if NSUserDefaults.standardUserDefaults().objectForKey("locationArray") != nil {
        for dictionary in NSUserDefaults.standardUserDefaults().objectForKey("locationArray") as! [[String:Double]]{
            let center = CLLocationCoordinate2D(latitude: dictionary["latitude"]!, longitude: dictionary["longitude"]!)
            let annotation = MKPointAnnotation()
            annotation.coordinate = center
            self?.placesMap?.addAnnotation(annotation)
        }
    }
}

我的主视图控制器类有以下代码，用于处理地图等：

import UIKit
import MapKit
import CoreLocation

class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate, UISearchBarDelegate, UIPopoverPresentationControllerDelegate {

    var location: CLLocation!
    let locationManager = CLLocationManager()

    @IBOutlet weak var placesMap: MKMapView!
    @IBOutlet weak var addButton: UIBarButtonItem!
    @IBOutlet weak var moreStuff: UIButton!

    // Popover button action
    @IBAction func moreStuff(sender: AnyObject) {
        self.performSegueWithIdentifier("showMoreStuff", sender:self)
        moreStuff.adjustsImageWhenHighlighted = false
    }

    @IBAction func addButton(sender: AnyObject) {
        let annotation = MKPointAnnotation()
        annotation.coordinate = CLLocationCoordinate2D(latitude: self.placesMap.userLocation.coordinate.latitude, longitude: self.placesMap.userLocation.coordinate.longitude)
        self.placesMap.addAnnotation(annotation)
        self.locationManager.startUpdatingLocation()
    }

    // Location function
    func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        let location = locations.last
        let center = CLLocationCoordinate2D(latitude: location!.coordinate.latitude, longitude: location!.coordinate.longitude)
        let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.004, longitudeDelta: 0.004))
        self.placesMap?.setRegion(region, animated: true)
        self.locationManager.stopUpdatingLocation()
        let locationDictionary:[String:Double] = ["latitude":center.latitude,"longitude":center.longitude]
        var locationArray = [[String:Double]]()
        if NSUserDefaults.standardUserDefaults().objectForKey("locationArray") != nil {
             locationArray = NSUserDefaults.standardUserDefaults().objectForKey("locationArray") as! [[String:Double]]
    }
        locationArray.append(locationDictionary)
        NSUserDefaults.standardUserDefaults().setObject(locationArray, forKey: "locationArray")
        NSUserDefaults.standardUserDefaults().synchronize()
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        self.locationManager.delegate = self
        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
        self.locationManager.requestWhenInUseAuthorization()
        self.locationManager.startUpdatingLocation()
        self.placesMap?.showsUserLocation = true
        if NSUserDefaults.standardUserDefaults().objectForKey("locationArray") != nil {
            for dictionary in NSUserDefaults.standardUserDefaults().objectForKey("locationArray") as! [[String:Double]]{
                let center = CLLocationCoordinate2D(latitude: dictionary["latitude"]!, longitude: dictionary["longitude"]!)
                let annotation = MKPointAnnotation()
                annotation.coordinate = center
                self.placesMap?.addAnnotation(annotation)
            }
        }
    }

NSNotificationCenter.defaultCenter().addObserverForName("memoriesUpdated", object: nil, queue: nil) { [weak self] (n) -> Void in
    // remove existing annotations
    if let annotations = self?.placesMap.annotations {
         self?.placesMap.removeAnnotations(annotations)
    }

    // add new annotations (if any)
    if NSUserDefaults.standardUserDefaults().objectForKey("locationArray") != nil {
        for dictionary in NSUserDefaults.standardUserDefaults().objectForKey("locationArray") as! [[String:Double]]{
            let center = CLLocationCoordinate2D(latitude: dictionary["latitude"]!, longitude: dictionary["longitude"]!)
            let annotation = MKPointAnnotation()
            annotation.coordinate = center
            self?.placesMap?.addAnnotation(annotation)
        }
    }
}

这是重置记忆按钮的出口和操作，此代码存储在名为“PopoverOptions”的popover的新类中。当前，当按下按钮时，地图上不会移除任何针脚：

@IBOutlet weak var resetMemories: UIButton!

@IBAction func resetMemories(sender: AnyObject) {
    func removeStoredLocations(){
        NSUserDefaults.standardUserDefaults().removeObjectForKey("locationArray")
        NSUserDefaults.standardUserDefaults().synchronize()
    }
}

NSNotificationCenter.defaultCenter().addObserverForName("memoriesUpdated", object: nil, queue: nil) { [weak self] (n) -> Void in
    // remove existing annotations
    if let annotations = self?.placesMap.annotations {
         self?.placesMap.removeAnnotations(annotations)
    }

    // add new annotations (if any)
    if NSUserDefaults.standardUserDefaults().objectForKey("locationArray") != nil {
        for dictionary in NSUserDefaults.standardUserDefaults().objectForKey("locationArray") as! [[String:Double]]{
            let center = CLLocationCoordinate2D(latitude: dictionary["latitude"]!, longitude: dictionary["longitude"]!)
            let annotation = MKPointAnnotation()
            annotation.coordinate = center
            self?.placesMap?.addAnnotation(annotation)
        }
    }
}

---

感谢您的帮助，我是Swift新手，您正在更新备份阵列，但不是地图视图本身。将

placesMap.removeAnnotations（placesMap.annotations）

添加到

resetMemories（）

NSNotificationCenter.defaultCenter().addObserverForName("memoriesUpdated", object: nil, queue: nil) { [weak self] (n) -> Void in
    // remove existing annotations
    if let annotations = self?.placesMap.annotations {
         self?.placesMap.removeAnnotations(annotations)
    }

    // add new annotations (if any)
    if NSUserDefaults.standardUserDefaults().objectForKey("locationArray") != nil {
        for dictionary in NSUserDefaults.standardUserDefaults().objectForKey("locationArray") as! [[String:Double]]{
            let center = CLLocationCoordinate2D(latitude: dictionary["latitude"]!, longitude: dictionary["longitude"]!)
            let annotation = MKPointAnnotation()
            annotation.coordinate = center
            self?.placesMap?.addAnnotation(annotation)
        }
    }
}

---

更新：由于操作位于另一个文件中，因此从

resetMemories（）

发出通知：

NSNotificationCenter.defaultCenter().addObserverForName("memoriesUpdated", object: nil, queue: nil) { [weak self] (n) -> Void in
    // remove existing annotations
    if let annotations = self?.placesMap.annotations {
         self?.placesMap.removeAnnotations(annotations)
    }

    // add new annotations (if any)
    if NSUserDefaults.standardUserDefaults().objectForKey("locationArray") != nil {
        for dictionary in NSUserDefaults.standardUserDefaults().objectForKey("locationArray") as! [[String:Double]]{
            let center = CLLocationCoordinate2D(latitude: dictionary["latitude"]!, longitude: dictionary["longitude"]!)
            let annotation = MKPointAnnotation()
            annotation.coordinate = center
            self?.placesMap?.addAnnotation(annotation)
        }
    }
}

然后在视图控制器中侦听通知并更新PIN：

NSNotificationCenter.defaultCenter().addObserverForName("memoriesUpdated", object: nil, queue: nil) { [weak self] (n) -> Void in
    // remove existing annotations
    if let annotations = self?.placesMap.annotations {
         self?.placesMap.removeAnnotations(annotations)
    }

    // add new annotations (if any)
    if NSUserDefaults.standardUserDefaults().objectForKey("locationArray") != nil {
        for dictionary in NSUserDefaults.standardUserDefaults().objectForKey("locationArray") as! [[String:Double]]{
            let center = CLLocationCoordinate2D(latitude: dictionary["latitude"]!, longitude: dictionary["longitude"]!)
            let annotation = MKPointAnnotation()
            annotation.coordinate = center
            self?.placesMap?.addAnnotation(annotation)
        }
    }
}

---

您正在更新备份阵列，但不更新地图视图本身。将

placesMap.removeAnnotations（placesMap.annotations）

添加到

resetMemories（）

NSNotificationCenter.defaultCenter().addObserverForName("memoriesUpdated", object: nil, queue: nil) { [weak self] (n) -> Void in
    // remove existing annotations
    if let annotations = self?.placesMap.annotations {
         self?.placesMap.removeAnnotations(annotations)
    }

    // add new annotations (if any)
    if NSUserDefaults.standardUserDefaults().objectForKey("locationArray") != nil {
        for dictionary in NSUserDefaults.standardUserDefaults().objectForKey("locationArray") as! [[String:Double]]{
            let center = CLLocationCoordinate2D(latitude: dictionary["latitude"]!, longitude: dictionary["longitude"]!)
            let annotation = MKPointAnnotation()
            annotation.coordinate = center
            self?.placesMap?.addAnnotation(annotation)
        }
    }
}

---

更新：由于操作位于另一个文件中，因此从

resetMemories（）

发出通知：

NSNotificationCenter.defaultCenter().addObserverForName("memoriesUpdated", object: nil, queue: nil) { [weak self] (n) -> Void in
    // remove existing annotations
    if let annotations = self?.placesMap.annotations {
         self?.placesMap.removeAnnotations(annotations)
    }

    // add new annotations (if any)
    if NSUserDefaults.standardUserDefaults().objectForKey("locationArray") != nil {
        for dictionary in NSUserDefaults.standardUserDefaults().objectForKey("locationArray") as! [[String:Double]]{
            let center = CLLocationCoordinate2D(latitude: dictionary["latitude"]!, longitude: dictionary["longitude"]!)
            let annotation = MKPointAnnotation()
            annotation.coordinate = center
            self?.placesMap?.addAnnotation(annotation)
        }
    }
}

然后在视图控制器中侦听通知并更新PIN：

NSNotificationCenter.defaultCenter().addObserverForName("memoriesUpdated", object: nil, queue: nil) { [weak self] (n) -> Void in
    // remove existing annotations
    if let annotations = self?.placesMap.annotations {
         self?.placesMap.removeAnnotations(annotations)
    }

    // add new annotations (if any)
    if NSUserDefaults.standardUserDefaults().objectForKey("locationArray") != nil {
        for dictionary in NSUserDefaults.standardUserDefaults().objectForKey("locationArray") as! [[String:Double]]{
            let center = CLLocationCoordinate2D(latitude: dictionary["latitude"]!, longitude: dictionary["longitude"]!)
            let annotation = MKPointAnnotation()
            annotation.coordinate = center
            self?.placesMap?.addAnnotation(annotation)
        }
    }
}

---

感谢您的回复：）我尝试了您的建议，但由于resetMemories（）函数位于一个新类中，因此它无法查看placeMap！您有什么进一步的建议吗？您可以从

resetMemories（）

发出通知，然后在收到该通知时更新注释。我将编辑我的答案。再次感谢，我现在将尝试这个。视图控制器代码应该插入到viewDidLoad函数中，对吗？是的，您还需要在适当的时候停止观察通知（可能在

dealloc

）。好的，谢谢：）我插入了代码，现在在第三行出现错误，指出“可选类型的值”[MKAnnotation]？未打开包装，您是想使用吗？或者？“当我应用建议的修复程序时，它运行时没有错误，但在按下按钮时仍然没有更改地图上的PIN:（感谢您的回答：）我尝试了您的建议，但由于resetmembers（）函数位于新类中，它无法看到placemap！您有什么进一步的建议吗？您可以从

resetMemories（）

发出通知，然后在收到该通知时更新注释。我将编辑我的答案。再次感谢，我现在将尝试这个。视图控制器代码应该插入到viewDidLoad函数中，对吗？是的，您还需要在适当的时候停止观察通知（可能在

dealloc

）。好的，谢谢：）我插入了代码，现在在第三行出现错误，指出“可选类型的值”[MKAnnotation]？未打开包装，您是想使用！还是？“当我应用建议的修复程序时，它运行时没有错误，但按下按钮时地图上的针脚仍然没有更改：(