Ios 我能'；在第一次设置MKMapView注释标题后，似乎没有设置该标题

我在搜索字段中键入一个地址，然后单击go。找到位置后，地图将放大。我点击pin图像，标题气泡弹出并显示标题

我创建了一个属性“pin”作为对title属性的引用。完成拖动到新位置后，我使用对新位置的引用设置属性标题标签。在NSLog中，属性显示为已更改。但当我点击“拖动到新位置”并结束拖动时，title属性的相同原始值保持不变

我已经看了很多关于类似事情的问题，但都不管用

这是我的GO按钮方法：

  @IBAction func didTapGoButton(sender: UIButton) {
        self.spinnerContainer.hidden = false
        var geocoder = CLGeocoder()
        geocoder.geocodeAddressString(searchField.text, {(placemarks: [AnyObject]!, error: NSError!) -> Void in
            if let placemark = placemarks?[0] as? CLPlacemark {


                var region = self.mapView.region as MKCoordinateRegion
                region.center = placemark.location.coordinate
                region.span.longitudeDelta = 0.0144927536
                region.span.latitudeDelta = 0.0144927536

                self.mapView.zoomEnabled = true
                self.mapView.scrollEnabled = true
                let pa = MKPointAnnotation()
                pa.coordinate = placemark.location.coordinate
                pa.title = "\(placemark.name), \(placemark.locality), \(placemark.country)"

                self.spinnerContainer.hidden = true
                self.mapView.addAnnotation(pa)
                self.pin = pa
                self.mapView.setRegion(region, animated: true)
                self.annotationTitle = pa.title
                self.searchField.text = ""

                //self.mapView.selectAnnotation(pa, animated: true)

                var newLocation = CLLocation(latitude: pa.coordinate.latitude, longitude: pa.coordinate.longitude)
                var geocoder = CLGeocoder()
                geocoder.reverseGeocodeLocation(newLocation, completionHandler: { (placemarks: [AnyObject]!, error: NSError!) -> Void in
                    if let placemark = placemarks?[0] as? CLPlacemark {


                      //  let pa = MKPointAnnotation()
                        pa.coordinate = placemark.location.coordinate
                        pa.title = "\(placemark.name), \(placemark.locality), \(placemark.administrativeArea), \(placemark.country), \(placemark.postalCode)"

                        NSLog("\(pa.title)")
                        self.addressFromCoordinates.text = pa.title
                        self.noAddressLabel.hidden = true

                    }
                })


            }

        })
    }

func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {

    if annotation.isKindOfClass(MKUserLocation) {
        return nil
    }

    let reuseId = "pin"
    var pin = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId)

    if pin == nil {
        NSLog("PIN NIL")
        pin = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
        pin.image = UIImage(named: "pin")
        pin.draggable = true
        pin.canShowCallout = true

    }
    else
    {
        NSLog("PIN NOT NIL")
        pin.annotation = annotation
    }
    return pin;
}

 func mapView(mapView: MKMapView!, annotationView view: MKAnnotationView!, didChangeDragState newState: MKAnnotationViewDragState, fromOldState oldState: MKAnnotationViewDragState) {
        if newState == MKAnnotationViewDragState.Starting
        {
            view.dragState = MKAnnotationViewDragState.Dragging
        }
        else if newState == MKAnnotationViewDragState.Ending || newState == MKAnnotationViewDragState.Canceling
        {
            view.dragState = MKAnnotationViewDragState.None


            var newLocation = CLLocation(latitude: self.pin.coordinate.latitude, longitude: self.pin.coordinate.longitude)

            var geocoder = CLGeocoder()
            geocoder.reverseGeocodeLocation(newLocation, completionHandler: { (placemarks: [AnyObject]!, error: NSError!) -> Void in
                if let placemark = placemarks?[0] as? CLPlacemark {

                    let pa = MKPointAnnotation()
                    pa.coordinate = placemark.location.coordinate
                    pa.title = "\(placemark.name), \(placemark.locality), \(placemark.administrativeArea), \(placemark.country), \(placemark.postalCode)"

                    self.annotationTitle = pa.title

                    self.addressFromCoordinates.text = pa.title
                    self.editAddressButton.hidden = false
                    self.noAddressLabel.hidden = true
                }
            })
            NSLog("\(self.pin.coordinate.latitude), \(self.pin.coordinate.longitude)")
        }
    }

我对动画的看法：

  @IBAction func didTapGoButton(sender: UIButton) {
        self.spinnerContainer.hidden = false
        var geocoder = CLGeocoder()
        geocoder.geocodeAddressString(searchField.text, {(placemarks: [AnyObject]!, error: NSError!) -> Void in
            if let placemark = placemarks?[0] as? CLPlacemark {


                var region = self.mapView.region as MKCoordinateRegion
                region.center = placemark.location.coordinate
                region.span.longitudeDelta = 0.0144927536
                region.span.latitudeDelta = 0.0144927536

                self.mapView.zoomEnabled = true
                self.mapView.scrollEnabled = true
                let pa = MKPointAnnotation()
                pa.coordinate = placemark.location.coordinate
                pa.title = "\(placemark.name), \(placemark.locality), \(placemark.country)"

                self.spinnerContainer.hidden = true
                self.mapView.addAnnotation(pa)
                self.pin = pa
                self.mapView.setRegion(region, animated: true)
                self.annotationTitle = pa.title
                self.searchField.text = ""

                //self.mapView.selectAnnotation(pa, animated: true)

                var newLocation = CLLocation(latitude: pa.coordinate.latitude, longitude: pa.coordinate.longitude)
                var geocoder = CLGeocoder()
                geocoder.reverseGeocodeLocation(newLocation, completionHandler: { (placemarks: [AnyObject]!, error: NSError!) -> Void in
                    if let placemark = placemarks?[0] as? CLPlacemark {


                      //  let pa = MKPointAnnotation()
                        pa.coordinate = placemark.location.coordinate
                        pa.title = "\(placemark.name), \(placemark.locality), \(placemark.administrativeArea), \(placemark.country), \(placemark.postalCode)"

                        NSLog("\(pa.title)")
                        self.addressFromCoordinates.text = pa.title
                        self.noAddressLabel.hidden = true

                    }
                })


            }

        })
    }

func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {

    if annotation.isKindOfClass(MKUserLocation) {
        return nil
    }

    let reuseId = "pin"
    var pin = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId)

    if pin == nil {
        NSLog("PIN NIL")
        pin = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
        pin.image = UIImage(named: "pin")
        pin.draggable = true
        pin.canShowCallout = true

    }
    else
    {
        NSLog("PIN NOT NIL")
        pin.annotation = annotation
    }
    return pin;
}

 func mapView(mapView: MKMapView!, annotationView view: MKAnnotationView!, didChangeDragState newState: MKAnnotationViewDragState, fromOldState oldState: MKAnnotationViewDragState) {
        if newState == MKAnnotationViewDragState.Starting
        {
            view.dragState = MKAnnotationViewDragState.Dragging
        }
        else if newState == MKAnnotationViewDragState.Ending || newState == MKAnnotationViewDragState.Canceling
        {
            view.dragState = MKAnnotationViewDragState.None


            var newLocation = CLLocation(latitude: self.pin.coordinate.latitude, longitude: self.pin.coordinate.longitude)

            var geocoder = CLGeocoder()
            geocoder.reverseGeocodeLocation(newLocation, completionHandler: { (placemarks: [AnyObject]!, error: NSError!) -> Void in
                if let placemark = placemarks?[0] as? CLPlacemark {

                    let pa = MKPointAnnotation()
                    pa.coordinate = placemark.location.coordinate
                    pa.title = "\(placemark.name), \(placemark.locality), \(placemark.administrativeArea), \(placemark.country), \(placemark.postalCode)"

                    self.annotationTitle = pa.title

                    self.addressFromCoordinates.text = pa.title
                    self.editAddressButton.hidden = false
                    self.noAddressLabel.hidden = true
                }
            })
            NSLog("\(self.pin.coordinate.latitude), \(self.pin.coordinate.longitude)")
        }
    }

我的didChangeDragState方法：

  @IBAction func didTapGoButton(sender: UIButton) {
        self.spinnerContainer.hidden = false
        var geocoder = CLGeocoder()
        geocoder.geocodeAddressString(searchField.text, {(placemarks: [AnyObject]!, error: NSError!) -> Void in
            if let placemark = placemarks?[0] as? CLPlacemark {


                var region = self.mapView.region as MKCoordinateRegion
                region.center = placemark.location.coordinate
                region.span.longitudeDelta = 0.0144927536
                region.span.latitudeDelta = 0.0144927536

                self.mapView.zoomEnabled = true
                self.mapView.scrollEnabled = true
                let pa = MKPointAnnotation()
                pa.coordinate = placemark.location.coordinate
                pa.title = "\(placemark.name), \(placemark.locality), \(placemark.country)"

                self.spinnerContainer.hidden = true
                self.mapView.addAnnotation(pa)
                self.pin = pa
                self.mapView.setRegion(region, animated: true)
                self.annotationTitle = pa.title
                self.searchField.text = ""

                //self.mapView.selectAnnotation(pa, animated: true)

                var newLocation = CLLocation(latitude: pa.coordinate.latitude, longitude: pa.coordinate.longitude)
                var geocoder = CLGeocoder()
                geocoder.reverseGeocodeLocation(newLocation, completionHandler: { (placemarks: [AnyObject]!, error: NSError!) -> Void in
                    if let placemark = placemarks?[0] as? CLPlacemark {


                      //  let pa = MKPointAnnotation()
                        pa.coordinate = placemark.location.coordinate
                        pa.title = "\(placemark.name), \(placemark.locality), \(placemark.administrativeArea), \(placemark.country), \(placemark.postalCode)"

                        NSLog("\(pa.title)")
                        self.addressFromCoordinates.text = pa.title
                        self.noAddressLabel.hidden = true

                    }
                })


            }

        })
    }

func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {

    if annotation.isKindOfClass(MKUserLocation) {
        return nil
    }

    let reuseId = "pin"
    var pin = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId)

    if pin == nil {
        NSLog("PIN NIL")
        pin = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
        pin.image = UIImage(named: "pin")
        pin.draggable = true
        pin.canShowCallout = true

    }
    else
    {
        NSLog("PIN NOT NIL")
        pin.annotation = annotation
    }
    return pin;
}

 func mapView(mapView: MKMapView!, annotationView view: MKAnnotationView!, didChangeDragState newState: MKAnnotationViewDragState, fromOldState oldState: MKAnnotationViewDragState) {
        if newState == MKAnnotationViewDragState.Starting
        {
            view.dragState = MKAnnotationViewDragState.Dragging
        }
        else if newState == MKAnnotationViewDragState.Ending || newState == MKAnnotationViewDragState.Canceling
        {
            view.dragState = MKAnnotationViewDragState.None


            var newLocation = CLLocation(latitude: self.pin.coordinate.latitude, longitude: self.pin.coordinate.longitude)

            var geocoder = CLGeocoder()
            geocoder.reverseGeocodeLocation(newLocation, completionHandler: { (placemarks: [AnyObject]!, error: NSError!) -> Void in
                if let placemark = placemarks?[0] as? CLPlacemark {

                    let pa = MKPointAnnotation()
                    pa.coordinate = placemark.location.coordinate
                    pa.title = "\(placemark.name), \(placemark.locality), \(placemark.administrativeArea), \(placemark.country), \(placemark.postalCode)"

                    self.annotationTitle = pa.title

                    self.addressFromCoordinates.text = pa.title
                    self.editAddressButton.hidden = false
                    self.noAddressLabel.hidden = true
                }
            })
            NSLog("\(self.pin.coordinate.latitude), \(self.pin.coordinate.longitude)")
        }
    }

拖动后是否需要对地图视图进行某种刷新

---

感谢您在

didChangeDragState

中抽出时间，此代码：

let pa = MKPointAnnotation()
pa.coordinate = placemark.location.coordinate
pa.title = "\(placemark.name), \(placemark.locality), \(placemark.administrativeArea), \(placemark.country), \(placemark.postalCode)"

self.annotationTitle = pa.title

未更新刚刚拖动的批注的标题，因为：

pa.title=…

中的

pa

指的是

MKPointAnnotation

的新实例，该实例未以任何方式连接到刚才拖动的批注。

let pa=MKPointAnnotation（）

行创建

MKPointAnnotation

的新实例。这个新实例只是本地存在于内存中，甚至没有添加到映射中

对

self.annotationTitle

的更新对刚才拖动的批注实例的

title

没有影响，因为

annotationTitle

只是您声明的某个单独的字符串变量，而添加到映射中并刚刚拖动的原始

MKPointAnnotation

没有任何知识或属性与

annotationTitle

的任何连接（事实上

annotationTitle

最初设置为等于

didTapGoButton

中注释的

title

，并不以某种方式将两个字符串“链接”在一起）

在

didTapGoButton

中，保存对实际添加（然后拖动）到

pin

变量中的注释对象的引用。此

pin

变量是可用于更新拖动的批注的

标题的参考（假设一次只有一个批注）

因此，在
didChangeDragState
中，将上面显示的代码更改为：

self.pin.coordinate = placemark.location.coordinate
self.pin.title = "\(placemark.name), \(placemark.locality), \(placemark.administrativeArea), \(placemark.country), \(placemark.postalCode)"

self.annotationTitle = self.pin.title



但是，对于您的需求，请注意，首先并不需要保留自己对注释的引用

在
didChangeDragState
中，可以访问直接从传递到方法中的
视图
参数拖动的注释。例如：

let ann = view.annotation as MKPointAnnotation
ann.coordinate = placemark.location.coordinate
ann.title = "\(placemark.name), \(placemark.locality), \(placemark.administrativeArea), \(placemark.country), \(placemark.postalCode)"

self.annotationTitle = ann.title



旁注：

拖动注释并对新位置进行反向地理编码后，地理编码坐标很可能与用户拖动注释的位置不同。之所以会出现这种情况，是因为最近的地理编码地址可能离注释拖动到的位置稍远。因此，在用户完成拖动后，注释将稍微移动。如果您希望将注释保留在用户拖动注释的准确位置，请不要在geocoder的完成块中更新注释的
坐标
，而只更新
标题
。如果地理编码地址距离实际坐标X米或更多，您可能希望将标题设置为“接近xyz”。
谢谢。这立刻奏效了。我觉得旁注很有帮助。是否可以通过ann.title编辑标题的字体大小。它不允许我调用sizeWithFonts等。据我所知，没有简单的方法可以更改标题的字体。不幸的是，我认为您必须创建一个自定义详图索引视图，这可能会很乏味。