MapKit注释消失了

我有一个纬度数组和另一个经度数组,我添加到CLLocationCoordinate2D类型的数组.然后我使用新数组来注释地图上的多个点.一些,或大多数,甚至所有注释都在地图上显示但是当我放大(是的,放大IN)时,一些注释消失,然后回来,或者不.关于如何让它们全部可见的任何想法？这是我在缩小时所期望的行为,而不是.

这是我用于上述内容的代码.

import UIKit
import MapKit
import CoreLocation

class MultiMapVC: UIViewController, CLLocationManagerDelegate {

@IBOutlet weak var multiEventMap: MKMapView!

var latDouble = Double()
var lOngDouble= Double()
let manager = CLLocationManager()
var receivedArrayOfLats = [Double]()
var receivedArrayOfLOngs= [Double]()
var locatiOns= [CLLocationCoordinate2D]()


func locationManager(_ manager: CLLocationManager, didUpdateLocations uLocation: [CLLocation]) {
    let userLocation = uLocation[0]
    let span:MKCoordinateSpan = MKCoordinateSpanMake(0.3, 0.3)
    let usersLocation = userLocation.coordinate
    let region:MKCoordinateRegion = MKCoordinateRegionMake(usersLocation, span)
    multiEventMap.setRegion(region, animated: true)
    manager.distanceFilter = 1000
    self.multiEventMap.showsUserLocation = true
}

func multiPoint() {

    var coordinateArray: [CLLocationCoordinate2D] = []
    print ("Received Longitude Count = \(receivedArrayOfLongs.count)")
    print ("Received Latitude Count = \(receivedArrayOfLats.count)")
    if receivedArrayOfLats.count == receivedArrayOfLongs.count {
        for i in 0 ..

}


1> Leszek Szary..：
NiltiakSivad的解决方案有效,但它恢复到旧的iOS 10外观.如果你想为iOS 11保留新的iOS 11气球标记,并且只使用旧的iOS版本,那么你可以实现如下的委托方法:

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
    let reuseIdentifier = "annotationView"
    var view = mapView.dequeueReusableAnnotationView(withIdentifier: reuseIdentifier)
    if #available(iOS 11.0, *) {
        if view == nil {
            view = MKMarkerAnnotationView(annotation: annotation, reuseIdentifier: reuseIdentifier)
        }
        view?.displayPriority = .required
    } else {
        if view == nil {
            view = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseIdentifier)
        }
    }
    view?.annotation = annotation
    view?.canShowCallout = true
    return view
}

        

2> 小智..：
我遇到了类似的问题。我最好的猜测是，它与iOS 11如何检测到销钉冲突有关。实施自定义注释视图或还原为使用iOS 10针对我来说解决了这个问题。

例如，实现以下内容应该可以修复您的代码：

class MultiMapVC: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
   override func viewDidLoad() {
       super.viewDidLoad()
       mapView.delegate = self    
    }

    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
       guard let annotation = annotation as? MKPointAnnotation else { return nil }

       let identifier = "pin-marker"
       var view: MKAnnotationView

       if let dequeuedView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier) as? MKPinAnnotationView {
           dequeuedView.annotation = annotation
           view = dequeuedView
       } else {
           view = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
       }
       return view
   }
}


如果这不起作用，则有一个displayPriority值得研究的属性，因为它有助于确定何时应隐藏/显示不同缩放级别的引脚。有关更多信息，请访问https://developer.apple.com/documentation/mapkit/mkannotationview/2867298-displaypriority

希望这可以帮助。