在callOut视图中添加标题

Question

我创建了下面的视图，在这里我想在callOut中添加一个标题，但是我似乎不知道在哪里和如何做它。我想将它添加到注释中，它位于else if annotation.isKindOfClass(FBAnnotation)语句中。

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

    var reuseId = ""

    if annotation.isKindOfClass(FBAnnotationCluster) {
        var reuseId = "Annonation"
        reuseId = "Cluster"
        var clusterView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId)
        clusterView = FBAnnotationClusterView(annotation: annotation, reuseIdentifier: reuseId)

        return clusterView

    } else if annotation.isKindOfClass(FBAnnotation) {

        let singleAnnotation = annotation as! FBAnnotation
        reuseId = "Pin"
        var pinView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId)
        pinView = FBSingleClusterView(annotation: annotation, reuseIdentifier: reuseId) as FBSingleClusterView
        pinView!.image = UIImage(named: singleAnnotation.imageString)


        pinView?.canShowCallout = false
        let imagePinView = UIImageView(frame: CGRectMake(7.5, 7.5, pinView!.image!.size.width-15, pinView!.image!.size.width-15))
        imagePinView.clipsToBounds = true
        imagePinView.layer.cornerRadius = (pinView!.image!.size.width-15)/2
        imagePinView.contentMode = UIViewContentMode.ScaleAspectFill
        imagePinView.image = UIImage(data: singleAnnotation.logoImage)
        pinView?.addSubview(imagePinView)




        return pinView
    } else {
        return nil
    }

}

FBAnnotation

class FBAnnotation : NSObject {

    var coordinate = CLLocationCoordinate2D()
    var imageString = ""
    var logoImage = NSData()

}

extension FBAnnotation : MKAnnotation {

}

Answer 1

看来你把canShowCallout设为假了。如果你想打个招呼的话，这应该是真的。

pinView?.canShowCallout = false

还必须在MKAnnotation中设置title属性以使其在标注中显示。

MKAnnotation协议有一个标题，但它是可选的，所以您必须确保它是在自定义注释中实现的

class FBAnnotation : NSObject, MKAnnotation {

    var coordinate = CLLocationCoordinate2D()
    var imageString = ""
    var logoImage = NSData()
    var title: String?
    var subtitle: String?
} 

或

class FBAnnotation : NSObject {

    var coordinate = CLLocationCoordinate2D()
    var imageString = ""
    var logoImage = NSData()

}

extension FBAnnotation : MKAnnotation {
    var title: String?
    var subtitle: String?    
}