Question

我正在使用iOS 11 MKMarkerAnnotationView创建一个带有地图和100-200 MKPointAnnotation的简单视图控制器

这是控制器的viewDidLoad

 override func viewDidLoad() {
    super.viewDidLoad()
    self.mapView.register(StationAnnotationView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier)
    self.mapView.register(StationClusterView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultClusterAnnotationViewReuseIdentifier)

    locationDelegate.delegate = self
    self.mapView.delegate = self
    self.mapView.showsUserLocation = true
    self.refreshData()
    self.establishUserPosition()
}

然后我从JSON（网络对象）下载电台，然后将所有电台添加到mapview

func reloadViews(){
    if let network = network{
        for station in network.stations{
            let annotation = StationAnnotation(station: station)
            annotations.append(annotation) // I add the annotations to an array to prevent them to be deallocated
            mapView.addAnnotation(annotation)
        }
    }
}

这是我的个人注释

class StationAnnotation : MKPointAnnotation{
var station : Station?
var tintColor : UIColor?{
    if self.station?.free_bikes ?? 0 > 0 {
        return .green
    }else{
        return .red
    }
}

var glyphImage : UIImage?{
    if self.station?.extra.status == "online"{
        return UIImage(named: "Bicycle")
    }else{
        return UIImage(named: "Ban")
    }
}

override init() {
    super.init()
}

convenience init(station : Station){
    self.init()
    self.title = station.name
    self.coordinate = CLLocationCoordinate2D(latitude: station.latitude, longitude: station.longitude)
    self.station = station
    if station.extra.status == "online"{
        self.subtitle =  "Bikes: \(station.free_bikes) - Slots: \(station.empty_slots)"
    }else{
        self.subtitle = station.extra.status
    }
}
}

我的习俗观点

class StationAnnotationView : MKMarkerAnnotationView{

override var annotation: MKAnnotation? {
    willSet {
        if let annotation = newValue as? StationAnnotation{

            self.markerTintColor = annotation.tintColor
            self.clusteringIdentifier = "station"
            self.glyphImage = annotation.glyphImage
        }
    }
}
}


class StationClusterView: MKAnnotationView {

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

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

override var annotation: MKAnnotation? {
    willSet {
        if let cluster = newValue as? MKClusterAnnotation {
            let renderer = UIGraphicsImageRenderer(size: CGSize(width: 40, height: 40))
            let count = cluster.memberAnnotations.count
            let onlineCount = cluster.memberAnnotations.filter { member -> Bool in
                return (member as! StationAnnotation).station?.extra.status == "online"
                }.count
            image = renderer.image { _ in
                // Fill full circle with tricycle color
                UIColor(named: "Forbidden")?.setFill()
                UIBezierPath(ovalIn: CGRect(x: 0, y: 0, width: 40, height: 40)).fill()

                // Fill pie with unicycle color
                UIColor(named: "Available")?.setFill()
                let piePath = UIBezierPath()
                piePath.addArc(withCenter: CGPoint(x: 20, y: 20), radius: 20,
                               startAngle: 0, endAngle: (CGFloat.pi * 2.0 * CGFloat(onlineCount)) / CGFloat(count),
                               clockwise: true)
                piePath.addLine(to: CGPoint(x: 20, y: 20))
                piePath.close()
                piePath.fill()

                // Fill inner circle with white color
                UIColor.white.setFill()
                UIBezierPath(ovalIn: CGRect(x: 8, y: 8, width: 24, height: 24)).fill()

                // Finally draw count text vertically and horizontally centered
                let attributes = [ NSAttributedStringKey.foregroundColor: UIColor.black,
                                   NSAttributedStringKey.font: UIFont.boldSystemFont(ofSize: 20)]
                let text = "\(count)"
                let size = text.size(withAttributes: attributes)
                let rect = CGRect(x: 20 - size.width / 2, y: 20 - size.height / 2, width: size.width, height: size.height)
                text.draw(in: rect, withAttributes: attributes)
            }
        }
    }
}

}

我不知道应用程序在捏合，缩放或平移时的原因，使用SIGABRT信号崩溃和此异常

*** Terminating app due to uncaught exception 
'NSInvalidArgumentException', reason: '*** -[__NSDictionaryM setObject:forKey:]: key cannot be nil'

我尝试过各种调试系统并且使用异常断点没有帮助......你有什么建议吗？

Answer 1

大家好，我找到了解决方案。起初 - 当我们使用

时就会发生这种情况

mapView.register(AnyClass?, forAnnotationViewWithReuseIdentifier: String)

和

mapView.dequeueReusableAnnotationView(withIdentifier: String)

返回nil。

如此热门修复：添加：

ViewController: UIViewController, MKMapViewDelegate

添加

    override func viewDidLoad() {  
        super.viewDidLoad()  
        mapView.delegate = self  

        mapView.register(MarkerPointView.self, forAnnotationViewWithReuseIdentifier: "marker")  
        mapView.register(ClusterView.self, forAnnotationViewWithReuseIdentifier: "cluster")  
}

最后：

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {  

        if let marker = annotation as? MarkerAnnotation{  
            var view = mapView.dequeueReusableAnnotationView(withIdentifier: "marker") as? MarkerPointView  
            if view == nil {  
//Very IMPORTANT  
                print("nil for Marker")  
                view = MarkerPointView(annotation: marker, reuseIdentifier: "marker")  
            }  
            return view  
        }else if let cluster = annotation as? MKClusterAnnotation{  
            var view = mapView.dequeueReusableAnnotationView(withIdentifier: "cluster") as? ClusterView  
            if view == nil{  
//Very IMPORTANT  
                print("nil for Cluster")  
                view = ClusterView(annotation: cluster, reuseIdentifier: "cluster")  
            }  
            return view  
        }  
        else{  
            return nil  
        }  
    }

希望对某人有所帮助，并在接下来的转发苹果修复它，因为我们可以像他们在36:50 wwdc2017上所说的那样使用它 - 我们不能删除它!!!!!!!!

原帖forums.developer.apple.com

使用MapKit时出现'NSInvalidArgumentException'

1 个答案: