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标题: ios - 单击时 MKViewMap 自定义注释消失 [打印本页]

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作者: 菜鸟教程小白    时间: 2022-12-12 11:42
标题: ios - 单击时 MKViewMap 自定义注释消失

我正在为 MKMap 创建自定义注释。它可以工作，但是当我点击注释时，注释消失(见图片)，然后标注显示并消失。

(我已经完成了本教程 https://www.raywenderlich.com/90971/introduction-mapkit-swift-tutorial )

这里是自定义注解:

class Trail: NSObject, MKAnnotation {

    let title: String?
    let difficulty: String
    let coordinate: CLLocationCoordinate2D
    var enableInfoButton : Bool

    init(title: String, difficulty: String, coordinate: CLLocationCoordinate2D, enableInfoButton : Bool) {
        self.title = title
        self.difficulty = difficulty
        self.coordinate = coordinate
        self.enableInfoButton = enableInfoButton;
        super.init()
    }

    var subtitle: String? {
        return title
    }

    func annotationView() -> MKAnnotationView {
        let view = MKAnnotationView(annotation: self, reuseIdentifier: "trailPin")
        view.translatesAutoresizingMaskIntoConstraints = false
        view.enabled = true
        view.canShowCallout = true
        view.rightCalloutAccessoryView = UIButton(type: UIButtonType.Custom)
        view.centerOffset = CGPointMake(0, -32)

        if(difficulty == Difficulty.HARD){
            view.image = UIImage(named: "ic_map_poi_trail_hard")
        }
        else if(difficulty == Difficulty.AVERAGE){
            view.image = UIImage(named: "ic_map_poi_trail_average")
        }
        else if(difficulty == Difficulty.EASY){
            view.image = UIImage(named: "ic_map_poi_trail_easy")
        }

        return view
    }

    func infoClicked(sender: AnyObject?) {
        print("infoClicked")
    }
}

在 View Controller 中:

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

        if (annotation.isKindOfClass(Trail)) {
            let customAnnotation = annotation as? Trail
            mapView.translatesAutoresizingMaskIntoConstraints = false
            var annotationView = mapView.dequeueReusableAnnotationViewWithIdentifier("trailPin") as MKAnnotationView!

            if (annotationView == nil) {
                annotationView = customAnnotation?.annotationView()
            } else {
                annotationView.annotation = annotation;
            }

            return annotationView
        } else {
            let reuseId = "trailPin"

            var anView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId)
            if anView == nil {
                anView = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
                anView!.image = UIImage(named:"map")
                anView!.canShowCallout = true
            }
            else {
                //we are re-using a view, update its annotation reference...
                anView!.annotation = annotation
            }

            return anView
        }
    }

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Best Answer-推荐答案

我自己找到了解决方案，这是一行:

view.translatesAutoresizingMaskIntoConstraints = false

我删除了它，它的工作

关于ios - 单击时 MKViewMap 自定义注释消失，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38147187/

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