我有一个工作循环来为一些工作数据点设置标题和字幕元素的注释。我想要在相同的循环结构中执行的操作是将图钉颜色设置为“紫色”,而不是默认值。我不知道要怎么做才能进入我的MapView来相应地设置图钉。
我的工作循环和某些尝试…
.... 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. }
您需要实现viewForAnnotation委托方法并MKAnnotationView从那里返回一个(或子类)。 就像在Objective-C中一样-基础SDK的工作方式相同。
viewForAnnotation
MKAnnotationView
MKPinAnnotationView从for添加注释的循环中删除创建的内容,并改为实现委托方法。
MKPinAnnotationView
for
这是viewForAnnotationSwift中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 }