Question

我创建了一个MKMapView，它在地图上包含几个MKPointAnnotations。当用户在视图中单击UIButton时，我想在日志中打印标题。我怎样才能做到这一点？到目前为止，我有这个：

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

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

    let reuseId = "pin"

    var pinView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId) as? MKPinAnnotationView
    if pinView == nil {
        pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
        pinView!.canShowCallout = true
        pinView!.animatesDrop = true
        pinView!.pinColor = .Purple


        var rightButton: AnyObject! = UIButton.buttonWithType(UIButtonType.DetailDisclosure)
        //MapPointAnnotation *point = (MapPointAnnotation*)pinView.annotation;
        //rightButton.venue = point.venue;
        rightButton.titleForState(UIControlState.Normal)

        rightButton.addTarget(self, action: "rightButtonTapped:", forControlEvents: UIControlEvents.TouchUpInside)
        pinView!.rightCalloutAccessoryView = rightButton as UIView

    }
    else {
        pinView!.annotation = annotation
    }

    return pinView
}



func rightButtonTapped(sender: AnyObject) {


}

Answer 1

在自定义rightButtonTapped方法中，获取对已点击的注释的引用的简单可靠方法是使用地图视图的selectedAnnotations数组：

func rightButtonTapped(sender: AnyObject) {
    if self.mapView.selectedAnnotations?.count == 0 {
        //no annotation selected
        return;
    }

    if let ann = self.mapView.selectedAnnotations[0] as? MKAnnotation {
        println("\(ann.title!)")
    }
}

（即使selectedAnnotations是一个数组，地图视图也只允许一次注释＆＃34;一次选择＃34;因此当前选定的注释始终位于索引0处。）

但是，使用自定义按钮方法更好的方法是使用地图视图的calloutAccessoryControlTapped委托方法。委托方法将您传递的注释视图的引用传递给您，您可以从中轻松获取基础注释。

要使用委托方法，删除自定义方法的addTarget行：

//Do NOT call addTarget if you want to use the calloutAccessoryControlTapped
//delegate method instead of a custom button method.
//rightButton.addTarget(self, action: "rightButtonTapped:", forControlEvents: UIControlEvents.TouchUpInside)

然后实现委托方法而不是自定义按钮方法：

func mapView(mapView: MKMapView!, annotationView view: MKAnnotationView!, calloutAccessoryControlTapped control: UIControl!) {
    println("\(view.annotation.title!)")
}

获取MKPointAnnotation标题

1 个答案: