当由 rightCalloutAccessoryView 触发时，我正在尝试访问我在自定义注释数据中设置的一些自定义数据。我收到如下所述的编译器错误。这是我的自定义 MKAnnotation，带有几个额外的变量 - status 和 supplierdataindex
class CustomMapPinAnnotation : NSObject, MKAnnotation {
var coordinate: CLLocationCoordinate2D
var title: String
var subtitle: String
var status: Int
var supplierdataindex: Int
init(coordinate: CLLocationCoordinate2D, title: String, subtitle: String, status: Int, supplierdataindex: Int) {
self.coordinate = coordinate
self.title = title
self.subtitle = subtitle
self.status = status
self.supplierdataindex = supplierdataindex
}
} // CustomMapPinAnnotation
var myCustomMapPinAnnotationArray = [CustomMapPinAnnotation] ()
// I build an array and put that into myCustomMapPinAnnotationArray
...
// I add the annotations initially in viewDidLoad in the ViewController.swift via this call
theMapView.addAnnotations(myCustomMapPinAnnotationArray)
就 map 和图钉而言，一切都很好，但现在我想访问 myCustomMapPinAnnotation 数组的自定义部分，特别是“状态”和“供应商数据索引” 这将插入更详细 View 的决策。我正在使用 calloutAccessoryControlTapped 来捕捉点击。
问题是这个编译器在下面给我一个错误，我尝试设置访问权限，我认为这会让我指向我认为应该内置到注释数据中的自定义数据。
“MKAnnotation”不能转换为“CustomMapPinAnnotation”
func mapView(mapView: MKMapView!, annotationView: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {
if control == annotationView.rightCalloutAccessoryView {
// This works and prints the data
println("Right Callout was pressed and title = \(annotationView.annotation.title)")
// This line yields a compiler error of: 'MKAnnotation is not convertible to 'CustomMapPinAnnotation'
var pinannotation : CustomMapPinAnnotation = annotationView.annotation
println("status was = \(myannotation.status)")
println("supplierdataindex was = \(myannotation.supplierdataindex)")
}
}
最佳答案
您必须像这样将其类型转换为 CustomMapPinAnnotation，
func mapView(mapView: MKMapView!, annotationView: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {
if control == annotationView.rightCalloutAccessoryView {
if let pinannotation = annotationView.annotation as? CustomMapPinAnnotation{
println("status was = \(pinannotation.status)")
println("supplierdataindex was = \(pinannotation.supplierdataindex)")
}
}
}
关于swift - 通过 rightCalloutAccessoryView 访问自定义 MKAnnotation 数据时出现问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25967783/