MKViewMap自定义注释在单击时消失 [英] MKViewMap custom annotation disappears on click

问题描述

我正在为MKMap创建自定义注释.是可行的，但是当我单击注释时，注释消失(参见图片)，然后标注显示也消失.

I'm creating custom annotation for MKMap. It's work, but when I click on an annotation, the annotation disappears (see image), then the callout show and disappears too.

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

(I have done this tutorial https://www.raywenderlich.com/90971/introduction-mapkit-swift-tutorial)

此处是自定义注释:

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")
    }
}

并在视图控制器中:

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
        }
    }

推荐答案

我自己找到了解决方案，这是一行:

I found the solution myself, this was the line :

view.translatesAutoresizingMaskIntoConstraints = false

我删除了它，而且可以正常工作

I deleted it and it's work

这篇关于MKViewMap自定义注释在单击时消失的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！