Question

我有一个工作循环来为一些工作数据点设置标题和副标题元素的注释。我想在同一个循环结构中做的是将引脚颜色设置为紫色而不是默认值。我无法弄清楚我需要做些什么来点击我的theMapView来相应地设置引脚。

我的工作循环和一些尝试...

....
for var index = 0; index < MySupplierData.count; ++index {

  // Establish an Annotation
  myAnnotation = MKPointAnnotation();
  ... establish the coordinate,title, subtitle properties - this all works
  self.theMapView.addAnnotation(myAnnotation)  // this works great.

  // In thinking about PinView and how to set it up I have this...
  myPinView = MKPinAnnotationView();      
  myPinView.animatesDrop = true;
  myPinView.pinColor = MKPinAnnotationColor.Purple;  

  // Now how do I get this view to be used for this particular Annotation in theMapView that I am iterating through??? Somehow I need to marry them or know how to replace these attributes directly without the above code for each data point added to the view
  // It would be nice to have some kind of addPinView.  

}

Answer 1

您需要实现viewForAnnotation委托方法并从那里返回MKAnnotationView（或子类）。
这与Objective-C类似 - 底层SDK的工作方式相同。

从添加注释的MKPinAnnotationView循环中删除for的创建，并改为实现委托方法。

以下是Swift中viewForAnnotation委托方法的示例实现：

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
    }
    else {
        pinView!.annotation = annotation
    }

    return pinView
}

坚持在Swift和MapKit中使用MKPinAnnotationView（）

1 个答案: