Question

需要将注释逐个删除到地图中...甚至从左到右删除注释引脚。是否有一种方法可以使注释更加时尚和简单

func addannotaiton(){
    sistermaplist.mapType = MKMapType.standard
    sistermaplist.removeAnnotations(sistermaplist.annotations)
    var i = 0
    let count = mapsisterarray.count
    let span: MKCoordinateSpan = MKCoordinateSpanMake(1.5,1.5)
    while (i != count ) {

        let mbr = mapsisterarray[i]

        if mbr.lat != "",mbr.lon != ""{
        let latitude  = Double((mbr.lat  ?? "0.0")!)
        let longitude = Double((mbr.lon ?? "0.0")!)

        let location: CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude!, longitude!)
        let region: MKCoordinateRegion = MKCoordinateRegionMake(location, span)
        sistermaplist.setRegion(region, animated: true)

        let annotation = MKPointAnnotation()
        annotation.coordinate = location
        annotation.title = mbr.name ?? ""

        annotation.subtitle = mbr.meet_place ?? ""

        sistermaplist.addAnnotation(annotation)



    }
        i += 1
    }


}

Answer 1

如果您想控制动画，我建议您自己动手。您可以将MKAnnotationView子类化，并将其作为子视图添加到其中。然后随时随地为引脚设置动画。

据说我会同时将所有注释添加到视图中，但会为动作本身设置动画。

以下是一个非常快速的示例解决方案，主要在代码中完成（地图视图和按钮在故事板中），因此您可以将其用作参考，但需要一些额外的工作......

import MapKit

class ViewController: UIViewController {

    @IBOutlet weak var mapView: MKMapView!


    override func viewDidLoad() {
        super.viewDidLoad()
        mapView.delegate = self
        // Do any additional setup after loading the view, typically from a nib.
    }

    @IBAction func dropPinsPressed(_ sender: Any) {

        let coordinates: [CLLocationCoordinate2D] = (0..<50).map { _ in
            let point = CGPoint(x: CGFloat(Int(arc4random())%1000)/1000.0 * view.bounds.size.width, y: CGFloat(Int(arc4random())%1000)/1000.0 * view.bounds.size.height)
            return mapView.convert(point, toCoordinateFrom: mapView)
        }
        let anotations = coordinates.map { Annotation(coordinate: $0) }
        let sorted = anotations.sorted { $0.coordinate.longitude < $1.coordinate.longitude }
        let duration: TimeInterval = 2.0 // overall animation duration
        let durationFragment = duration/TimeInterval(sorted.count) // Duration between 2 drops

        sorted.enumerated().forEach { $1.delay = durationFragment*TimeInterval($0) }

        mapView.addAnnotations(sorted)
    }

}

extension ViewController: MKMapViewDelegate {

    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        return PinView(animateDropFrom: view.frame.size.height, delay: (annotation as? Annotation)?.delay ?? 0.0)
    }

}

fileprivate extension ViewController  {

    class Annotation: NSObject, MKAnnotation {
        var coordinate: CLLocationCoordinate2D
        var delay: TimeInterval = 0.0

        init(coordinate: CLLocationCoordinate2D) {
            self.coordinate = coordinate
        }
    }

}

fileprivate extension ViewController  {

    class PinView: MKAnnotationView {

        lazy var pinView: UIView = {
            let view = UIView(frame: self.bounds)
            view.backgroundColor = UIColor.red
            self.addSubview(view)
            return view
        }()

        convenience init(animateDropFrom height: CGFloat, delay: TimeInterval) {
            self.init(frame: CGRect(x: 0.0, y: 0.0, width: 10.0, height: 20.0))

            pinView.frame = CGRect(x: bounds.origin.x, y: bounds.origin.y-height, width: bounds.size.width, height: bounds.size.height)

            UIView.animate(withDuration: 0.3, delay: delay, options: [.curveEaseIn], animations: { 
                self.pinView.frame = self.bounds
            }, completion: nil)
        }

    }

}

接下来设计的最大问题是，如果您滚动当前地图然后返回，则丢弃的引脚将再次掉落。由于Annotation是自定义子类，因此您可能只需将垂直偏移量添加到该类中。然后，当您第一次设置动画时，将偏移重置为零，它将不再为其设置动画。除非这是你的预期行为......

如何逐个删除MKAnnotation Pin？

1 个答案: