Question

我修复了原来的问题，但是我有一个新的错误，上面写着“Type'ViewController'不符合协议'SideBarDelegate'。”

我知道我非常接近这个工作，但由于某种原因无法弄清楚为什么会这样！有人可以帮忙吗？

class ViewController: UIViewController, SideBarDelegate  {

var sideBar: SideBar = SideBar()

@IBOutlet weak var mapView: MKMapView!

let locationsRef = FIRDatabase.database().reference(withPath:     "locations")

    override func viewDidLoad() {
    super.viewDidLoad()

    mapView.delegate = self
    mapView.showsUserLocation = true

    //sidebar

    sideBar = SideBar(sourceView: self.view, skateItems: ["All Skate Spots", "Skateparks", "Street Skating"])

    // Passing firebase annotation data

    locationsRef.observe(.value, with: { snapshot in

        for item in snapshot.children {

            guard let locationData = item as? FIRDataSnapshot else { continue }

            let locationValue = locationData.value as! [String: Any]

            var location: CLLocationCoordinate2D!

            if let lat = locationValue["lat"] as? String {
                // Stored as String
                let lng = Double(locationValue["lng"] as! String)!
                location = CLLocationCoordinate2D(latitude: Double(lat)!, longitude: lng)
            }
            else {
                // Stored as a floating point number
                let lat = locationValue["lat"] as! Double
                let lng = locationValue["lng"] as! Double
                location = CLLocationCoordinate2D(latitude: lat, longitude: lng)
            }

            let name = locationValue["name"] as! String

            let subtitle = locationValue["subtitle"] as! String

            self.addAnnotation(at: location, name: name, subtitle: subtitle)

        }
    })
}

func addAnnotation(at location: CLLocationCoordinate2D, name: String, subtitle: String) {

    // Adding annotation to the map

        let annotation = MKPointAnnotation()

        annotation.coordinate = CLLocationCoordinate2D(latitude: location.latitude, longitude: location.longitude)

        annotation.title = name

        annotation.subtitle = subtitle

        mapView.addAnnotation(annotation)

}

}

func sideBarDidSelectButtonAtIndex(index: Int) {

}

extension ViewController: MKMapViewDelegate {

}

extension ViewController: CLLocationManagerDelegate {



}

Answer 1

通常委托被声明为弱可选（解决了未初始化的错误）

weak var delegate: SideBarDelegate?

并且始终使用可选链接调用，如果未设置委托，则不执行任何操作。

例如

delegate?.sideBarWillClose?()

CG Rect Issue - 无法调用初始化程序

1 个答案: