声明仅在文件范围内有效如何修复？

Question

我的 swift 文件有问题。我正在尝试按照 Youtube 上的教程进行操作，但他没有收到错误消息。这是代码：

class ViewController: UIViewController, CLLocationManagerDelegate {
    
    private let locationManager = CLLocationManager()
    private var currentLocation: CLLocationCoordinate2D?
    
    @IBOutlet weak var mapView: MKMapView!
    override func viewDidLoad() {
        super.viewDidLoad()
        configerLocationServices()
    }
    
    private func configerLocationServices() {
        locationManager.delegate = self
        
        let status = CLLocationManager.authorizationStatus()
        
        if status == .notDetermined {
            locationManager.requestWhenInUseAuthorization()
        } else if status == .authorizedAlways || status == .authorizedWhenInUse {
            locationManager.desiredAccuracy = kCLLocationAccuracyBest
            locationManager.startUpdatingLocation()
            
            }
    }

    extension ViewController: CLLocationManagerDelegate { //Error: Declaration is only valid at file scope
    
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        print("Did get latest Lcation")
    }
    func locationManagerDidChangeAuthorization(_ manager: CLLocationManager) {
        print("The Status changed")
    }
}

}

我不知道我做错了什么，有没有人有解决办法？

提前致谢。

Answer 1

删除 class ViewController: UIViewController, CLLocationManagerDelegate 行中的 CLLocationManagerDelegate 声明。另外，确保正确设置所有花括号对，我的意思是在正确的位置打开和关闭

Answer 2

那是因为您在 class 中声明了一个扩展。将它移到 class 之外，编译器将停止抱怨

class ViewController: UIViewController {
    
    private let locationManager = CLLocationManager()
    private var currentLocation: CLLocationCoordinate2D?
    
    @IBOutlet weak var mapView: MKMapView!
    override func viewDidLoad() {
        super.viewDidLoad()
        configerLocationServices()
    }
    
    private func configerLocationServices() {
        locationManager.delegate = self
        
        let status = CLLocationManager.authorizationStatus()
        
        if status == .notDetermined {
            locationManager.requestWhenInUseAuthorization()
        } else if status == .authorizedAlways || status == .authorizedWhenInUse {
            locationManager.desiredAccuracy = kCLLocationAccuracyBest
            locationManager.startUpdatingLocation()
            
            }
    }
}

extension ViewController: CLLocationManagerDelegate {
    
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        print("Did get latest Lcation")
    }
    func locationManagerDidChangeAuthorization(_ manager: CLLocationManager) {
        print("The Status changed")
    }
}

您已在 ViewController 扩展中明确确认 CLLocationManagerDelegate，因此您无需在 class 声明中确认（这将导致编译器警告您重复确认到协议）所以将 class ViewController: UIViewController, CLLocationManagerDelegate 更改为 class ViewController: UIViewController

声明仅在文件范围内有效如何修复？

Declaration is only valid at file scope how to fix?

ios

swift

xcode

error-handling

xcode11