我有一个工作循环为一些工作数据点设置标题和字幕元素的注释.在同一循环结构中我想做的是将引脚颜色设置为紫色而不是默认值.我不知道的是,我需要做的是点击我的mapView来相应地设置引脚.
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.
}
解决方法
您需要实现viewForAnnotation委托方法并返回一个MKAnnotationView(或子类).
这就像在Objective-C中 – 底层SDK的工作方式相同.
这就像在Objective-C中 – 底层SDK的工作方式相同.
从添加注释的for循环中删除MKPinAnnotationView的创建,并实现代理方法.
以下是Swift中的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
}
