Question

我正在为MKMap创建自定义注释。这是有效的，但是当我点击一个注释时，注释会消失（见图），然后标注显示并消失。

（我已完成本教程https://www.raywenderlich.com/90971/introduction-mapkit-swift-tutorial）

这里是自定义注释：

`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")
    }

    /*if(self.enableInfoButton){
        let detailButton = UIButton(type: UIButtonType.System) as UIButton
        detailButton.frame.size.width = 35
        detailButton.frame.size.height = 35
        detailButton.backgroundColor = UIColor.whiteColor()
        detailButton.setImage(UIImage(named: "map"), forState: .Normal)
        detailButton.addTarget(self, action: #selector(Trail.infoClicked(_:)), forControlEvents: .TouchUpInside)

        view.leftCalloutAccessoryView = detailButton
    }*/
    return view
}

func infoClicked(sender: AnyObject?) {

    print("infoClicked")

}

}`

并在视图控制器中：

func mapView（mapView：MKMapView，viewForAnnotation annotation：MKAnnotation） - ＆gt; 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;
        }
        //self.addBounceAnimationToView(annotationView)
        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
    }
}

谢谢=）

再见

Answer 1

我自己找到了解决方案，这就是行：

view.translatesAutoresizingMaskIntoConstraints = false

我删除了它以及它的工作

MKViewMap自定义注释在点击时消失

1 个答案: