Question

我有一个带有自定义注释的mapView。我还为此添加了一个按钮，但有没有办法查看按下按钮的注释？

因此，控制台的帖子不应该只是“Disclosure Pressed！”。我需要一些类似“Disclosure Pressed！ info（X） .subtitle”的内容，以查看用户录制的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
    }

}

我已经尝试过类似的事情：

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

Answer 1

在calloutAccessoryControlTapped委托方法中，self不是其标注其标注附件视图的注释。

self指的是包含该方法的类的实例（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的引用：annotationView.annotation。

但请注意，您的委托方法声明与记录的方法声明略有不同（annotationView参数具有本地名称view，其他参数标记为可选，!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用。

下面的完整示例还说明了如何检查注释是否是您的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)")
        }
    }

}

旁注：
由于您已将leftCalloutAccessoryView设置为UIImageView，因此点按它将不调用calloutAccessoryControlTapped，因为它仅针对作为{{的子类的视图调用1}}。 UIControl不是UIImageView的子类。如果您需要检测左侧附件上的水龙头，请创建自定义UIControl（并设置其图像），而不是UIButton。

Swift Annotation CallOut按钮选择

1 个答案: