快速注释CallOut按钮选择

Question

我有一个带有自定义注释的mapView。我还添加了一个按钮，但是有什么方法可以查看哪个注释是按下的吗？

所以到控制台的帖子不应该只是“公开按下！”。我需要像“公开按下！信息(X).subtitle”这样的东西来看到用户录制的info1或info2。

以下是代码：

import UIKit
import MapKit

class ViewController: UIViewController, MKMapViewDelegate {

    @IBOutlet weak var Map: MKMapView!

    class CustomPointAnnotation: MKPointAnnotation {
        var imageName: String!
    }

    @IBAction func btpressed(sender: AnyObject) {

    }

    override func viewDidLoad() {
        super.viewDidLoad()
        //1
        var lat1:CLLocationDegrees = 40.748708
        var long1:CLLocationDegrees = -73.985643
        var latDelta1:CLLocationDegrees = 0.01
        var longDelta1:CLLocationDegrees = 0.01

        var span1:MKCoordinateSpan = MKCoordinateSpanMake(latDelta1, longDelta1)
        var location1:CLLocationCoordinate2D = CLLocationCoordinate2DMake(lat1, long1)
        var region1:MKCoordinateRegion = MKCoordinateRegionMake(location1, span1)

        Map.setRegion(region1, animated: true)

        var info1 = CustomPointAnnotation()
        info1.coordinate = location1
        info1.title = "Test Title1!"
        info1.subtitle = "Subtitle1"
        info1.imageName = "1.png"

        Map.addAnnotation(info1)

        //2
        var lat2:CLLocationDegrees = 41.748708
        var long2:CLLocationDegrees = -72.985643
        var latDelta2:CLLocationDegrees = 0.01
        var longDelta2:CLLocationDegrees = 0.01

        var span2:MKCoordinateSpan = MKCoordinateSpanMake(latDelta2, longDelta2)
        var location2:CLLocationCoordinate2D = CLLocationCoordinate2DMake(lat2, long2)
        var region2:MKCoordinateRegion = MKCoordinateRegionMake(location2, span2)

        var info2 = CustomPointAnnotation()
        info2.coordinate = location2
        info2.title = "Test Title2!"
        info2.subtitle = "Subtitle2"
        info2.imageName = "2.png"
        Map.addAnnotation(info2)
    }

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

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

    func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
        if !(annotation is CustomPointAnnotation) {
            return nil
        }

        let reuseId = "test"

        var anView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId)
        if anView == nil {
            anView = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
            anView.canShowCallout = true

            anView.rightCalloutAccessoryView = UIButton.buttonWithType(.InfoDark) as UIButton

            var imageview = UIImageView(frame: CGRectMake(0, 0, 10, 10))
            imageview.image = UIImage(named: "1.png")
            anView!.leftCalloutAccessoryView = imageview
        } else {
            anView.annotation = annotation
        }

        //Set annotation-specific properties **AFTER**
        //the view is dequeued or created...

        let cpa = annotation as CustomPointAnnotation
        anView.image = UIImage(named:cpa.imageName)

        return anView
    }

}

我已经尝试过这样的方法：

if control == annotationView.rightCalloutAccessoryView {
    println("Disclosure Pressed!" \(self.subtitle))
}

Answer 1

在calloutAccessoryControlTapped委托方法中，self不是其标注附件视图被点击的注释。

self是指方法包含在其中的类的实例(即ViewController的实例)。另一个问题是，在println中，您将变量引用放在引号之外而不是内部。

委托方法为您提供了对注释视图的引用：annotationView参数。

注释视图包含对注释：annotationView.annotation的引用。

但是，请注意您的委托方法声明与文档中的方法声明略有不同(annotationView参数有一个本地名称view，其他参数被标记为可选的!后缀)。

最好使用文档化的声明，即使您的版本在技术上仍然有效。

下面的完整示例还展示了如何检查注释是否是自定义对象之一，以及如何访问自定义属性：

func mapView(mapView: MKMapView!, annotationView view: MKAnnotationView!, 
             calloutAccessoryControlTapped control: UIControl!) {

    if control == view.rightCalloutAccessoryView {
        println("Disclosure Pressed! \(view.annotation.subtitle)")

        if let cpa = view.annotation as? CustomPointAnnotation {
            println("cpa.imageName = \(cpa.imageName)")
        }
    }

}

附带说明：

既然您已经将leftCalloutAccessoryView设置为UIImageView，那么点击它就不会调用calloutAccessoryControlTapped，因为它只调用作为UIControl子类的视图。UIImageView不是UIControl的子类。如果您需要检测左侧附件上的点击，请创建一个自定义UIButton (并设置其图像)，而不是UIImageView。