为所有不同类型的 POI 显示相同图像的自定义注释

Posted 2023-04-14

【中文标题】为所有不同类型的 POI 显示相同图像的自定义注释

【英文标题】：Custom annotation showing same image for all different types of POI's

【发布时间】：2016-09-04 11:58:20

【问题描述】：

我需要在地图上为不同的 cat_ID 显示不同的注释。在这个问题中，我只包括两个类别。

    let item = json["data"].arrayValue
    var count = 0
    initMK()
    dispatch_async(dispatch_get_main_queue()) 
    while count < item.count
        let lat = item[count]["comp_lat"].stringValue
        let lng = item[count]["comp_lng"].stringValue

        if item[count]["ct_id"].stringValue == "783"
            self.state = "Jachthavens"
            let poi = MKPointAnnotation()
            let coordinates = CLLocationCoordinate2D(latitude: Double(lat)!, longitude: Double(lng)!)
            poi.coordinate = coordinates
            poi.title = item[count]["comp_name_pub"].stringValue
            poi.subtitle = "Jachthavens"
            //poi.id
            self.mapView.addAnnotation(poi)
            self.mapView.reloadInputViews()


        else if item[count]["ct_id"].stringValue == "788"

            self.state = "Watersportwinkels"
            let poi = MKPointAnnotation()
            let coordinates = CLLocationCoordinate2D(latitude: Double(lat)!, longitude: Double(lng)!)
            poi.coordinate = coordinates
            poi.title = item[count]["comp_name_pub"].stringValue
            poi.subtitle = "Watersportwinkels"
            self.mapView.addAnnotation(poi)
            self.mapView.reloadInputViews()
            
            count = count + 1
            
         

///////// 这是我设置不同图像的 viewForAnnotation 方法，只有在 (state == "Watersportwinkels") 和 (state == "Jachthavens") 时才会出现问题。结果我在地图上只能看到“Jachthavens”图像，但信息窗口上的详细信息是正确的。

让标识符 = "MyPin"

    if annotation.isKindOfClass(MKUserLocation) 
        return nil
    

    let detailButton: UIButton = UIButton(type: UIButtonType.DetailDisclosure)

    // Reuse the annotation if possible
    var annotationView = mapView.dequeueReusableAnnotationViewWithIdentifier(identifier)

    if annotationView == nil
    
        annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: "pin")
        annotationView!.canShowCallout = true
        if(state == "track")
        
        annotationView!.image = UIImage(named: "startpin")
        
        else if(state == "pause")
        
        annotationView!.image = UIImage(named: "pausepin")
        
        else if(state == "stop")
        
         annotationView!.image = UIImage(named: "endpin")
        else if (state == "Jachthavens") 
            annotationView!.image = UIImage(named: "jachthavenpin")
                let deleteButton = UIButton(type: UIButtonType.Custom) as UIButton
                deleteButton.frame.size.width = 35
                deleteButton.frame.size.height = 35
                deleteButton.backgroundColor = UIColor.whiteColor()
                deleteButton.setImage(UIImage(named: "jachthaven"), forState: .Normal)
                deleteButton.addTarget(self, action: #selector(ViewController.infoClicked(_:)), forControlEvents: .TouchUpInside)
                annotationView!.leftCalloutAccessoryView = deleteButton
            annotationView?.annotation = annotation



        else if (state == "Watersportwinkels")
            annotationView!.image = UIImage(named: "watersportwinkelspin")
            let deleteButton = UIButton(type: UIButtonType.Custom) as UIButton
            deleteButton.frame.size.width = 35
            deleteButton.frame.size.height = 35
            deleteButton.backgroundColor = UIColor.whiteColor()
            deleteButton.setImage(UIImage(named: "watersportwinkels"), forState: .Normal)
            deleteButton.addTarget(self, action: #selector(ViewController.infoClicked(_:)), forControlEvents: .TouchUpInside)
            annotationView!.leftCalloutAccessoryView = deleteButton
            annotationView?.annotation = annotation
        

    
    else
    
        annotationView!.annotation = annotation
    

    return annotationView

【参考方案1】：

你可以尝试改变吗：

else if  

进入：

else if(state == "Jachthavens")

更新：

检查字幕而不是状态：

if annotationView == nil 

    annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: "pin")
    annotationView!.canShowCallout = true

    if(annotationView.subtitle == "track") 
        annotationView!.image = UIImage(named: "startpin")
     else if(annotationView.subtitle == "pause") 
        annotationView!.image = UIImage(named: "pausepin")
     else if(annotationView.subtitle == "stop") 
        annotationView!.image = UIImage(named: "endpin")
     else if (annotationView.subtitle == "Jachthavens") 
        annotationView!.image = UIImage(named: "jachthavenpin")
        let deleteButton = UIButton(type: UIButtonType.Custom) as UIButton
        deleteButton.frame.size.width = 35
        deleteButton.frame.size.height = 35
        deleteButton.backgroundColor = UIColor.whiteColor()
        deleteButton.setImage(UIImage(named: "jachthaven"), forState: .Normal)
        deleteButton.addTarget(self, action: #selector(ViewController.infoClicked(_:)), forControlEvents: .TouchUpInside)
        annotationView!.leftCalloutAccessoryView = deleteButton
        annotationView?.annotation = annotation
     else if (annotationView.subtitle == "Watersportwinkels") 
        annotationView!.image = UIImage(named: "watersportwinkelspin")
        let deleteButton = UIButton(type: UIButtonType.Custom) as UIButton
        deleteButton.frame.size.width = 35
        deleteButton.frame.size.height = 35
        deleteButton.backgroundColor = UIColor.whiteColor()
        deleteButton.setImage(UIImage(named: "watersportwinkels"), forState: .Normal)
        deleteButton.addTarget(self, action: #selector(ViewController.infoClicked(_:)), forControlEvents: .TouchUpInside)
        annotationView!.leftCalloutAccessoryView = deleteButton
        annotationView?.annotation = annotation
    

 else 
    annotationView!.annotation = annotation

【讨论】：

这是我写的实际代码中的错误（state == "Jachthavens"）

@KrishnaThakur 我不确定我是否理解？代码现在有效还是？当你改变这个时会发生什么？

同样的问题自定义注释没有根据过滤器改变。显示 UIImage(named: "jachthavenpin") 图像。 if (state == "Watersportwinkels")

annotationView!.canShowCallout = true put: print(state) and run to see is state always "Jachthavens"，对我来说，看起来你正在设置一些全局变量状态，它总是有最后一个状态你从 Json 中读到

是的，你是对的，它总是品脱“Jachthavens”所以什么应该是可选的方式