MKMarkerAnnotationView 错误，由于未捕获的异常而终止应用程序

Question

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注解在地图上显示时，可以构建并执行，但执行过程中出错并停止。 MKMarkerAnnotationView 显示聚类和字形图像。 大约有 100 个注解，在加载 View 时从 Firestore 获取并存储在一个数组中。 地图放大或移动时发生错误。 斯威夫特版本：斯威夫特5 我也检查了插座连接，但看起来没有问题。

找不到解决方案，您能告诉我出了什么问题吗？ 我写了Map等的设置方法，但如果根本错误，请教我。

错误 [XXX.CustomPinAnnotation memberAnnotations]：无法识别的选择器发送到实例 0x2835e16c0

• 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“-[XXX.CustomPinAnnotation memberAnnotations]：无法识别的选择器发送到实例 0x2835e16c0”* 第一次抛出调用堆栈：

CustomPinAnnotation.swift

import UIKit
import MapKit

class CustomPinAnnotation: NSObject, MKAnnotation {

    let clusteringIdentifier : String
    let title: String?
    let subtitle: String?
    let coordinate: CLLocationCoordinate2D
    //let glyphText: String
    let glyphImage: UIImage
    let glyphTintColor: UIColor
    let markerTintColor: UIColor
    let objectid: Int

    init(_ clusteringIdentifier: String, title: String, subtitle: String, coordinate: CLLocationCoordinate2D, glyphImage: UIImage, glyphTintColor: UIColor, markerTintColor: UIColor, objectid: Int) {
        self.clusteringIdentifier = clusteringIdentifier
        self.title = title
        self.subtitle = subtitle
        self.coordinate = coordinate
//        self.glyphText = glyphText
        self.glyphImage = glyphImage
        self.glyphTintColor = glyphTintColor
        self.markerTintColor = markerTintColor
        self.objectid = objectid
    }
}

ViewController.swift

import UIKit
import MapKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {

    var locationManager = CLLocationManager()
    var userCoordinate = CLLocationCoordinate2D()

    //object array
    var objectAll = [objectData]()        

    //Map view
    @IBOutlet weak var mapView: MKMapView!

    func displayAllMountains() {
        for mountain in objectAll {
            let pinImage = UIImage.init(named: "XXXXX")!
            let subtitletext = String(object.height) + "m"
            let annotation = CustomPinAnnotation("clusterid", title:object.name, subtitle: subtitletext, coordinate: object.geopoint, glyphImage: pinImage, glyphTintColor: .white, markerTintColor: .darkGray, objectid: object.objectid)                        
            self.mapView.addAnnotation(annotation)
        }
    }

    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {   
        if annotation === mapView.userLocation {
            return nil
        } else {
            let annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier, for: annotation)

            guard let markerAnnotationView = annotationView as? MKMarkerAnnotationView,
                let annotation = annotation as? CustomPinAnnotation else {
                     return annotationView
            }

            markerAnnotationView.clusteringIdentifier = annotation.clusteringIdentifier
//            markerAnnotationView.glyphText = annotation.glyphText
            markerAnnotationView.glyphImage = annotation.glyphImage
            markerAnnotationView.glyphTintColor = annotation.glyphTintColor
            markerAnnotationView.markerTintColor = annotation.markerTintColor
            return markerAnnotationView
        }
    }
}

Answer 1

你说它是在报道：

错误 [XXX.CustomPinAnnotation memberAnnotations]：无法识别的选择器发送到实例 0x2835e16c0

memberAnnotations 是一个MKClusterAnnotation 方法。但它试图在您的 CustomPinAnnotation 对象上调用该方法。在某个地方，它试图在预期 MKClusterAnnotation 的上下文中使用 CustomPinAnnotation。

我在表达您的问题时遇到了麻烦，我不确定您分享的内容是否足以让我们重现它。但我可以很容易地看出它是如何被混淆的。有三种注解类型，不仅有MKUserLocation和CustomPinAnnotation，还有MKClusterAnnotation。您的 mapView(_:viewFor:) 只考虑前两种类型的存在。如果你愿意，你也可以让它处理MKClusterAnnotation：

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
    if annotation is MKUserLocation {
        return nil
    } else if annotation is MKClusterAnnotation {
        return mapView.dequeueReusableAnnotationView(withIdentifier: MKMapViewDefaultClusterAnnotationViewReuseIdentifier, for: annotation)
    }

    let annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier, for: annotation)

    guard
        let markerAnnotationView = annotationView as? MKMarkerAnnotationView,
        let annotation = annotation as? CustomPinAnnotation
    else {
        return annotationView
    }

    markerAnnotationView.clusteringIdentifier = annotation.clusteringIdentifier
    markerAnnotationView.displayPriority = .required
    // markerAnnotationView.glyphText = annotation.glyphText
    markerAnnotationView.glyphImage = annotation.glyphImage
    markerAnnotationView.glyphTintColor = annotation.glyphTintColor
    markerAnnotationView.markerTintColor = annotation.markerTintColor
    return markerAnnotationView
}

不过，我个人建议完全删除mapView(_:viewFor:)，而是定义您自己的注释视图类来执行此配置：

class CustomAnnotationView: MKMarkerAnnotationView {
    override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
        super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)
        update(for: annotation)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override var annotation: MKAnnotation? { didSet { update(for: annotation) } }
    
    func update(for annotation: MKAnnotation?) {
        displayPriority = .required

        guard let annotation = annotation as? CustomPinAnnotation else { return }
        
        clusteringIdentifier = annotation.clusteringIdentifier
        // markerAnnotationView.glyphText = annotation.glyphText
        glyphImage = annotation.glyphImage
        glyphTintColor = annotation.glyphTintColor
        markerTintColor = annotation.markerTintColor
    }
}

当然，请确保注册它（以及您的集群注释视图）：

mapView.register(CustomAnnotationView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier)
mapView.register(MKMarkerAnnotationView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultClusterAnnotationViewReuseIdentifier)

但关键是mapView(_:viewFor:)的默认实现会自动处理所有三种类型的注解视图。通过这种方式，我们将“我如何渲染这个注释视图”的代码从视图控制器（或任何MKMapViewDelegate）中取出，并进入它所属的注释视图类。