无法将 CLLocationCoordinate2D 转换为 (CLLocationCoordinate2D)

Question

我的代码有问题。我收到此错误消息：

Cannot convert value of type 'CLLocationCoordinate2D' to expected argument type '(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]()

Answer 1

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){  

}

要使用 contains 的数组，元素需要符合 Equatable 而由于 CLLocationCoordinate2D 不符合，那么错误修复需要您添加一个 where 子句来指定如何比较就像

Answer 2

CLLocationCoordinate2D不符合Equatable.

您必须在 where 闭包

中比较 latitude 和 longitude

if !locations.contains(where: {[=10=].latitude == locValue.latitude && [=10=].longitude == locValue.longitude}) { ...

无法将 CLLocationCoordinate2D 转换为 (CLLocationCoordinate2D)

Cannot convert CLLocationCoordinate2D to (CLLocationCoordinate2D)

contains

ios

swift