我正在制作一个可点击的地标。我设置了地标的标题。标题是地址。我想如果你点击那个地址，它会推送到另一个 View 以显示地址号码、城市、国家等。我试过这段代码。但是它在地标中的应用程序中没有UIButton，为什么？

编辑:如果我将断点放在 func calloutAccessoryControlTapped 上，它不会崩溃。

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

    if annotation is MKUserLocation {
        //return nil so map view draws "blue dot" for standard user location
        return nil
    }

    var pin = "pin"

    var view = Mapa.dequeueReusableAnnotationViewWithIdentifier(pin) as? MKPinAnnotationView
    if view == nil {
        view = MKPinAnnotationView(annotation: annotation, reuseIdentifier: pin)
        view!.canShowCallout = true
        view!.animatesDrop = true
        var arrowButton = UIButton()
        view!.rightCalloutAccessoryView = UIButton.buttonWithType(.DetailDisclosure) as! UIButton
    } else {
        view!.annotation = annotation
    }
    return view
}

func mapView(Mapa: MKMapView!, annotation: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {

    if control == annotation.rightCalloutAccessoryView {
        println("Pressed!")
    }
}

完整代码:

import UIKit
import CoreLocation
import MapKit

class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {

    @IBOutlet weak var Mapa: MKMapView!
    let locationManager = CLLocationManager()
    var detail: UIButton!

    override func viewDidLoad()
    {
        super.viewDidLoad()


        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.requestAlwaysAuthorization()
        locationManager.startUpdatingLocation()



        Mapa.delegate = self
        Mapa.mapType = MKMapType.Standard
        Mapa.showsUserLocation = true


    }

    override func didReceiveMemoryWarning()
    {
        super.didReceiveMemoryWarning()

    }



    //--- Find Address of Current Location ---//

    func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!)
    {
        //--- CLGeocode to get address of current location ---//
        CLGeocoder().reverseGeocodeLocation(manager.location, completionHandler: {(placemarks, error)->Void in
            let spanX = 0.007
            let spanY = 0.007
            var newRegion = MKCoordinateRegion(center: self.Mapa.userLocation.coordinate, span: MKCoordinateSpanMake(spanX, spanY))
            self.Mapa.setRegion(newRegion, animated: true)


            if (error != nil)
            {
                println("Reverse geocoder failed with error" + error.localizedDescription)
                return
            }

            if placemarks.count > 0
            {
                let pm = placemarks[0] as! CLPlacemark
                self.displayLocationInfo(pm)
            }
            else
            {
                println("Problem with the data received from geocoder")
            }
        })

    }


    func displayLocationInfo(placemark: CLPlacemark?)
    {
        if let Placemark = placemark
        {
            //Stop updating kvôli vydrži baterke
            locationManager.stopUpdatingLocation()
            let location = self.locationManager.location
            var latitude: Double = location.coordinate.latitude
            var longitude: Double = location.coordinate.longitude
            let adresa = (Placemark.thoroughfare != nil) ? Placemark.thoroughfare : "Ulica: "
            let cislo = (Placemark.subThoroughfare != nil) ? Placemark.subThoroughfare : "Číslo ulice:"
            let mesto = (Placemark.locality != nil) ? Placemark.locality : "Mesto: "
            let stat = (Placemark.country != nil) ? Placemark.country : "Štát: "




            var coordinates:CLLocationCoordinate2D = placemark!.location.coordinate
            let theLocation: MKUserLocation = Mapa.userLocation
            theLocation.title = adresa




            println("GPS Súradnice :: \(latitude), \(longitude)")
            println(mesto)
            println(adresa)
            println(cislo)
            println(stat)

        }

    }

    func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!)
    {
        println("Chyba pri aktualizovaní lokácie " + error.localizedDescription)
    }

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

        if annotation is MKUserLocation {
            //return nil so map view draws "blue dot" for standard user location
            return nil
        }

        var pin = "pin"

        var view = Mapa.dequeueReusableAnnotationViewWithIdentifier(pin) as? MKPinAnnotationView
        if view == nil {
            view = MKPinAnnotationView(annotation: annotation, reuseIdentifier: pin)
            view!.canShowCallout = true
            view!.animatesDrop = true
            var arrowButton = UIButton()
            view!.rightCalloutAccessoryView = UIButton.buttonWithType(.DetailDisclosure) as! UIButton
        } else {
            view!.annotation = annotation
        }
        return view
    }

    func mapView(Mapa: MKMapView!, annotation: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {

        if control == annotation.rightCalloutAccessoryView {
            println("Pressed!")
        }
    }
}

最佳答案

您想在蓝点(用户位置)的标注上放置一个附件按钮。

在 viewForAnnotation 委托(delegate)方法中，您确实有创建注释 View 和设置 rightCalloutAccessoryView 的代码，但在方法的顶部有这段代码:

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

    if annotation is MKUserLocation {
        //return nil so map view draws "blue dot" for standard user location
        return nil
    }

map 的用户位置注释是 MKUserLocation 类型，因此本地图 View 为其调用 viewForAnnotation 时，此代码为其返回 nil map View 解释为“显示此注释的默认 View 和标注”。默认标注仅显示标题和副标题。

创建自定义 View 并设置 rightCalloutAccessoryView 的代码永远不会执行。

要设置 rightCalloutAccessoryView，您需要引用实际的注释 view 对象。

您可以为 MKUserLocation 删除 return nil，但随后您将获得标准图钉而不是动画蓝点。

您不能创建自己的动画蓝点 View 实例，因为该类是私有(private)的。

因此您无法在 viewForAnnotation 委托(delegate)方法中创建或访问用户位置注释 View 。

您可以可靠地访问实际用户位置注释 View 的地方是 didAddAnnotationViews 委托(delegate)方法。我建议使用这种方法，因为这意味着实际上已经创建了一个注释 View 并显示在屏幕上。

在此方法中，调用 map View 的viewForAnnotation 实例方法并将其userLocation 注释传递给它，然后设置 View 的rightCalloutAccessoryView:

func mapView(mapView: MKMapView!, didAddAnnotationViews views: [AnyObject]!) {
    if let ulav = mapView.viewForAnnotation(mapView.userLocation) {
        ulav.rightCalloutAccessoryView = UIButton.buttonWithType(.DetailDisclosure) as! UIButton
    }
}

您的方法名为 mapView(annotation:calloutAccessoryControlTapped)。

annotation 参数必须命名为 annotationView 并且即使将 map View 参数命名为 Mapa 也可以，我建议坚持给定的签名在文档中，因此修改后的方法将是:

func mapView(mapView: MKMapView!, annotationView view: MKAnnotationView!, calloutAccessoryControlTapped control: UIControl!) {
    if control == annotationView.rightCalloutAccessoryView {
        println("Pressed!")
    }
}

关于ios - 在用户位置标注上添加附件按钮，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30201330/