如何将click监听器添加到选定的mkannotationview?

问题描述 投票:0回答:1

我需要点击地图上的注释。我可以看到像这样的mkannotationview选择的注释视图

我想在此选定的注释视图上添加单击侦听器,以打开另一个带有注释详细信息的视图控制器。我怎样才能做到这一点?

func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) {
    if let selected = (view.annotation as? CustomAnnotation) {
        self.selectedAnnotation = selected
    }
}

编辑

ios swift mkannotationview
1个回答
1
投票

一般来说,你会添加一个rightCalloutAccessoryView然后实现calloutAccessoryControlTapped,如how do I make a pin annotation callout?所示

但是你说:

我需要让整个标注可以点击

MapKit没有委托方法来捕获标注上的点击,本身仅在附件视图上。但是您可以添加自己的委托来为您执行此操作。

protocol CustomAnnotationViewDelegate: class {
    func didTapCallout(for annotation: MKAnnotation)
}

class CustomAnnotationView: MKPinAnnotationView {
    static let preferredReuseIdentifier = Bundle.main.bundleIdentifier! + ".customAnnotationView"

    weak var delegate: CustomAnnotationViewDelegate?

    override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
        super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)

        canShowCallout = true

        let tap = UITapGestureRecognizer(target: self, action: #selector(didTapAnnotationView(_:)))
        self.addGestureRecognizer(tap)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    @objc func didTapAnnotationView(_ gesture: UITapGestureRecognizer) {
        let location = gesture.location(in: self)

        // ignore taps on the annotation view, itself

        if bounds.contains(location) { return }

        // if we got here, we must have tapped on the callout

        delegate?.didTapCallout(for: annotation!)
    }
}

然后在iOS 11及更高版本中,您可以注册此reuseIdentifier:

override func viewDidLoad() {
    super.viewDidLoad()

    mapView.register(CustomAnnotationView.self,
                     forAnnotationViewWithReuseIdentifier: CustomAnnotationView.preferredReuseIdentifier)
}

你的viewFor可以指定代表:

extension ViewController: MKMapViewDelegate {
    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        if annotation is MKUserLocation { return nil }

        let annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier, for: annotation) as! CustomAnnotationView
        annotationView.delegate = self
        return annotationView
    }
}

或者,如果您需要支持11之前的iOS版本,则不会注册重用标识符,但如果未成功出列,则必须自己手动实例化CustomAnnotationView

extension ViewController: MKMapViewDelegate {
    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        if annotation is MKUserLocation { return nil }

        var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: CustomAnnotationView.preferredReuseIdentifier) as? CustomAnnotationView
        if annotationView == nil {
            annotationView = CustomAnnotationView(annotation: annotation, reuseIdentifier: CustomAnnotationView.preferredReuseIdentifier)
            annotationView?.delegate = self
        } else {
            annotationView?.annotation = annotation
        }

        return annotationView
    }
}

无论哪种方式,您现在可以让您的视图控制器符合新的CustomAnnotationViewDelegate

extension ViewController: CustomAnnotationViewDelegate {
    func didTapCallout(for annotation: MKAnnotation) {
        print("tapped callout for \(annotation)")
    }
}

但请注意,在上面,我在CustomAnnotationView init方法中添加了点击手势识别器,以确保在首次创建注释视图时只创建一次轻击手势。

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