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[英]Convert UnsafeMutablePointer<CLLocationCoordinate2D> to [CLLocationCoordinate2D] in Swift
[英]Cannot convert CLLocationCoordinate2D to (CLLocationCoordinate2D)
我的代碼有問題。 我收到此錯誤消息:
無法將類型'CLLocationCoordinate2D'的值轉換為預期的參數類型'(CLLocationCoordinate2D)throws-> Bool'
if(locationManager.allowsBackgroundLocationUpdates && isDriving){
locationManager.startUpdatingLocation()
guard let locValue: CLLocationCoordinate2D = locationManager.location?.coordinate else { return }
Map.setCenter(locValue, animated: true)
Map.setRegion(MKCoordinateRegion(center: locValue, latitudinalMeters: 75, longitudinalMeters: 75), animated: true)
if !locations.contains(where: locValue) { //<- ERROR
locations.append(locValue);
NSLog("%f %f -> Gesamt: %d", locValue.latitude, locValue.longitude, locations.count);
let polyline = MKPolyline(coordinates: &locations, count: locations.count);
Map.addOverlay(polyline);
}
}
地點:
var locations = [CLLocationCoordinate2D]()
CLLocationCoordinate2D
不符合Equatable
。
您必須在where
閉包中比較latitude
和longitude
if !locations.contains(where: {$0.latitude == locValue.latitude && $0.longitude == locValue.longitude}) { ...
采用
extension CLLocationCoordinate2D : Equatable {
static public func ==(left: CLLocationCoordinate2D, right: CLLocationCoordinate2D) -> Bool {
return left.latitude == right.latitude && left.longitude == right.longitude
}
}
if !locations.contains(locValue){
}
為了使數組使用contains
,元素需要符合Equatable
並且由於CLLocationCoordinate2D
不符合,因此錯誤修復需要您添加where子句以指定比較的方式
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