我的代码有问题。我收到此错误消息:
无法将'CLLocationCoordinate2D'类型的值转换为预期的参数类型'(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);
}
}
地点:
var locations = [CLLocationCoordinate2D]()
CLLocationCoordinate2D
不符合Equatable
。
你需要在latitude
闭合中比较longitude
和where
if !locations.contains(where: {$0.latitude == locValue.latitude && $0.longitude == locValue.longitude}) { ...
使用
extension CLLocationCoordinate2D : Equatable {
static public func ==(left: CLLocationCoordinate2D, right: CLLocationCoordinate2D) -> Bool {
return left.latitude == right.latitude && left.longitude == right.longitude
}
}
if !locations.contains(locValue){
}
对于使用contains
的数组,元素需要符合Equatable
,并且因为CLLocationCoordinate2D
不符合,所以错误修复需要你添加一个where子句来指定比较将如何