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我正在尝试MGLMapView.visibleFeaturesAtPoint，但总是找回空数组。有人能告诉我我在这里做错了吗？Mapbox iOS SDK - visibleFeaturesAtPoint返回空数组
下面发布的是我的代码，它基本上是添加标记示例（https://www.mapbox.com/ios-sdk/examples/marker/），但使用相同的点在标记点处获取可见特征。
import Mapbox
class ViewController: UIViewController, MGLMapViewDelegate {
override func viewDidLoad() {
super.viewDidLoad()
let mapView = MGLMapView(frame: view.bounds)
mapView.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
// Set the map’s center coordinate and zoom level.
mapView.setCenterCoordinate(CLLocationCoordinate2D(latitude: 40.7326808, longitude: -73.9843407), zoomLevel: 12, animated: false)
view.addSubview(mapView)
// Set the delegate property of our map view to `self` after instantiating it.
mapView.delegate = self
// Declare the marker `hello` and set its coordinates, title, and subtitle.
let hello = MGLPointAnnotation()
hello.coordinate = CLLocationCoordinate2D(latitude: 40.7326808, longitude: -73.9843407)
hello.title = "Hello world!"
hello.subtitle = "Welcome to my marker"
// Add marker `hello` to the map.
mapView.addAnnotation(hello)
//let ptTest = CGPoint(x: 1, y: 1)
print(mapView.visibleCoordinateBounds)
let ptTest = mapView.convertCoordinate(hello.coordinate, toPointToView: mapView)
print(ptTest)
print(mapView.visibleFeatures(at: ptTest))
}
// Use the default marker. See also: our view annotation or custom marker examples.
func mapView(mapView: MGLMapView, viewForAnnotation annotation: MGLAnnotation) -> MGLAnnotationView? {
return nil
}
// Allow callout view to appear when an annotation is tapped.
func mapView(mapView: MGLMapView, annotationCanShowCallout annotation: MGLAnnotation) -> Bool {
return true
}
}