Question

我是 iOS 新手，我使用来自不同数组类型的静态标记实现了 MapKit，并且它们工作正常，例如，我试图将来自商店数组的引脚设置为蓝色，以及来自社区阅读的引脚等..我不知道如何做到这一点根本上，它们在地图中都是红色的，我的目标是更改每个针脚阵列的颜色

这里是我尝试过的：

import UIKit
import MapKit

class myMapViewController: UIViewController, MKMapViewDelegate {

    var shops = [Shops]()
    var communities = [Community]()
    var cyclists = [Cyclist]()
    var circuits = [Circuit]()
    
    @IBOutlet weak var myMap: MKMapView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
       
        shops.append(Shops(id: 0, title: "Shop1", latitude: 36.553015 , longitude: 10.592774))
        shops.append(Shops(id: 0, title: "Shop2", latitude: 35.499414 , longitude: 10.824846))
        communities.append(Community(id: 0, title: "community1", latitude: 37.276943 , longitude: 10.934709 ))
        communities.append(Community(id: 0, title: "community2", latitude: 35.427828 , longitude: 9.748186 ))
        circuits.append(Circuit(id: 0, title: "circuit1", latitude: 33.773035 , longitude: 10.857805 ))
        cyclists.append(Cyclist(id: 0, title: "cyclist1", latitude: 35.785118 , longitude: 10.000871 ))
        createShopsAnnotations(locations: shops)
        createCircuitsAnnotations(locations: circuits)
        createCommunityAnnotations(locations: communities)
        createCyclistsAnnotations(locations: cyclists)
    }
    
    func createShopsAnnotations(locations:[Shops]){
        for location in locations {
            let annotations = MKPointAnnotation()
            annotations.title = location.title as? String
            annotations.coordinate = CLLocationCoordinate2D(latitude: location.latitude as! CLLocationDegrees , longitude: location.longitude as! CLLocationDegrees)
            myMap.addAnnotation(annotations)
        }
    }
        
    func createCircuitsAnnotations(locations:[Circuit]){
        for location in locations {
            let annotations = MKPointAnnotation()
            annotations.title = location.title as? String
            annotations.coordinate = CLLocationCoordinate2D(latitude: location.latitude as! CLLocationDegrees , longitude: location.longitude as! CLLocationDegrees)
            myMap.addAnnotation(annotations)
        }
    }
    
    func createCommunityAnnotations(locations:[Community]){
        for location in locations {
            let annotations = MKPointAnnotation()
            annotations.title = location.title as? String
            annotations.coordinate = CLLocationCoordinate2D(latitude: location.latitude as! CLLocationDegrees , longitude: location.longitude as! CLLocationDegrees)
            myMap.addAnnotation(annotations)
        }
    }
    
    func createCyclistsAnnotations(locations:[Cyclist]){
        for location in locations {
            let annotations = MKPointAnnotation()
            annotations.title = location.title as? String
            annotations.coordinate = CLLocationCoordinate2D(latitude: location.latitude as! CLLocationDegrees , longitude: location.longitude as! CLLocationDegrees)
            
            myMap.addAnnotation(annotations)
        }
    }
}

我指导了一些教程，但我无法将它们应用到我的示例中。

Answer 1

基本思想是制作一个注解视图类型来渲染正确的颜色。因此，假设您有四种注释类型（见下文），那么您可能有一个像这样的注释视图类型：

class AnnotationView: MKMarkerAnnotationView {
    override var annotation: MKAnnotation? { didSet { update(for: annotation) } }

    override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
        super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)
        update(for: annotation)
    }

    required init?(coder: NSCoder) {
        super.init(coder: coder)
    }

    func update(for annotation: MKAnnotation?) {
        switch annotation {
        case is Shop: markerTintColor = .blue
        case is Community: markerTintColor = .cyan
        case is Cyclist: markerTintColor = .green
        case is Circuit: markerTintColor = .red
        default: break
        }
    }
}

然后你会让你的视图控制器为你的地图视图注册那个注释视图：

override func viewDidLoad() {
    super.viewDidLoad()

    mapView.register(AnnotationView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier)

    ...
}

请注意，当您注册这样的注释视图类型时，您不想要实现任何 mapView(_:viewFor:) 方法。自 iOS 11 起，不再需要/推荐该委托方法。

无论如何，该注释视图类型假定您有四种类型的注释。我个人会将 Shop、Community、Cyclist 和 Circuit 设为注释类型，例如

class Shop: NSObject, MKAnnotation {
    let id: Int
    dynamic var title: String?
    dynamic var subtitle: String?
    dynamic var coordinate: CLLocationCoordinate2D

    init(id: Int, title: String, subtitle: String? = nil, coordinate: CLLocationCoordinate2D) {
        self.id = id
        self.title = title
        self.subtitle = subtitle
        self.coordinate = coordinate

        super.init()
    }
}

// repeat for the other three types

然后，当我想将它们添加到我的地图时：

shops.append(Shop(id: 0, title: "Shop1", coordinate: CLLocationCoordinate2D(latitude: 36.553015, longitude: 10.592774)))
shops.append(Shop(id: 0, title: "Shop2", coordinate: CLLocationCoordinate2D(latitude: 35.499414 , longitude: 10.824846)))
communities.append(Community(id: 0, title: "community1", coordinate: CLLocationCoordinate2D(latitude: 37.276943 , longitude: 10.934709)))
communities.append(Community(id: 0, title: "community2", coordinate: CLLocationCoordinate2D(latitude: 35.427828 , longitude: 9.748186)))
circuits.append(Circuit(id: 0, title: "circuit1", coordinate: CLLocationCoordinate2D(latitude: 33.773035 , longitude: 10.857805)))
cyclists.append(Cyclist(id: 0, title: "cyclist1", coordinate: CLLocationCoordinate2D(latitude: 35.785118 , longitude: 10.000871)))

mapView.addAnnotations(shops + communities + circuits + cyclists)

或者，您可能有一种注释类型：

enum PlaceType {
    case shop, community, cyclist, circuit
}

class Place: NSObject, MKAnnotation {
    let id: Int
    let type: PlaceType
    dynamic var title: String?
    dynamic var subtitle: String?
    dynamic var coordinate: CLLocationCoordinate2D

    init(id: Int, type: PlaceType, title: String, subtitle: String? = nil, coordinate: CLLocationCoordinate2D) {
        self.id = id
        self.type = type
        self.title = title
        self.subtitle = subtitle
        self.coordinate = coordinate

        super.init()
    }
}

然后您将实例化这些地点：

var places = [Place]()

override func viewDidLoad() {
    super.viewDidLoad()

    mapView.register(AnnotationView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier)

    places = [
        Place(id: 0, type: .shop, title: "Shop1", coordinate: CLLocationCoordinate2D(latitude: 36.553015, longitude: 10.592774)),
        Place(id: 0, type: .shop, title: "Shop2", coordinate: CLLocationCoordinate2D(latitude: 35.499414 , longitude: 10.824846)),
        Place(id: 0, type: .community, title: "community1", coordinate: CLLocationCoordinate2D(latitude: 37.276943 , longitude: 10.934709)),
        Place(id: 0, type: .community, title: "community2", coordinate: CLLocationCoordinate2D(latitude: 35.427828 , longitude: 9.748186)),
        Place(id: 0, type: .circuit, title: "circuit1", coordinate: CLLocationCoordinate2D(latitude: 33.773035 , longitude: 10.857805)),
        Place(id: 0, type: .cyclist, title: "cyclist1", coordinate: CLLocationCoordinate2D(latitude: 35.785118 , longitude: 10.000871))
    ]
    mapView.addAnnotations(places)
}

然后您的注释视图类型将使用此 type 参数：

class AnnotationView: MKMarkerAnnotationView {
    override var annotation: MKAnnotation? { didSet { update(for: annotation) } }

    override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
        super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)
        update(for: annotation)
    }

    required init?(coder: NSCoder) {
        super.init(coder: coder)
    }

    func update(for annotation: MKAnnotation?) {
        guard let annotation = annotation as? Place else { return }

        switch annotation.type {
        case .shop: markerTintColor = .blue
        case .community: markerTintColor = .cyan
        case .cyclist: markerTintColor = .green
        case .circuit: markerTintColor = .red
        }
    }
}

结果：

设置不同颜色的 MapKit 引脚

1 个答案: