防止在MKMapView中取消选择注释

我找到了一种方法!制作一个名为“allowSelectionChanges”的布尔值,我现在只将其作为全局值。然后在MKMapView的子类中使用此重写函数:

override func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool {
        return allowSelectionChanges
    } 

只要您想阻止注释选择和取消选择,请将此变量切换为false。它不会影响用户在地图上移动的能力!

下面是一个示例,说明当您点击标注进行交互时,如何使用它来阻止标注被取消选中。把这个放在你的 MKAnnotationView 子类:

override func pointInside(point: CGPoint, withEvent event: UIEvent?) -> Bool {
        let rect = self.bounds
        var isInside = CGRectContainsPoint(rect, point)
        if !isInside {
            for view in self.subviews {
                isInside = CGRectContainsPoint(view.frame, point)
                if isInside {
                    allowSelectionChanges = false
                    return true
                }
            }
            allowSelectionChanges = true
        }

        return false
    }

好吧……我自己也有这个问题,虽然@clinton的回答给我指明了正确的方向,但我想出了一个解决方案,不需要你 MKAnnotationView 要了解的子类 mapView 的自定义属性。

这是我为Swift 3编写的解决方案:

public class <#CustomMapViewClass#>: MKMapView {

    private var allowSelectionChanges: Bool = true

    public override func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        return allowSelectionChanges
    }

    public override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        let pointInside = super.point(inside: point, with: event)
        if !pointInside {
            return pointInside
        }

        for annotation in annotations(in: visibleMapRect) where annotation is <#CustomAnnotationViewClass#> {
            guard let view = self.view(for: annotation as! MKAnnotation) else {
                continue
            }
            if view.frame.contains(point) {
                allowSelectionChanges = true
                return true
            }
        }
        allowSelectionChanges = false

        return pointInside
    }

}

我的工作基于@clinton和@mihai fratu。他们都给出了很好的答案,所以你也应该投他们一票。我想补充的是,如果点击的注释在一个集群中,或者如果它被禁用,那么您仍然可以取消选择。这是我试图修复的代码。

public class <#CustomMapViewClass#>: MKMapView {

    private var allowSelectionChanges: Bool = true

    public override func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        return allowSelectionChanges
    }

    public override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        let pointInside = super.point(inside: point, with: event)
        if pointInside {
            // Go through all annotations in the visible map rect
            for annotation in annotations(in: visibleMapRect) where annotation is MKAnnotation {
                // get the view of each annotation
                if let view: MKAnnotationView = self.view(for: annotation as! MKAnnotation) {
                    // work with the cluster view if there is one
                    let rootView = view.cluster ?? view
                    // If the frame of this view contains the selected point, then we are an annotation tap. Allow the gesture...
                    if (rootView.frame.contains(point)) {
                        allowSelectionChanges = rootView.isEnabled  // But only if the view is enabled
                        return pointInside
                    }
                }
            }
            // If you did not tap in any valid annotation, disallow the gesture
            allowSelectionChanges = false
        }
        return pointInside
    }
}