我有一个纬度数组和一个经度数组,将它们添加到类型为CLLocationCoordinate2D的数组中。然后使用新数组在地图上注释多个点。其中一些或大多数,甚至所有的注释都会显示在地图上,但当我放大地图时,一些注释会消失,然后再次出现,或者不出现。有没有什么办法让它们全部可见?这是我期望在缩小地图时出现的行为,而不是在放大时。
这是我用于上述描述的代码。
这是我用于上述描述的代码。
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 ..< receivedArrayOfLats.count {
let eventLocation = CLLocationCoordinate2DMake(receivedArrayOfLats[i], receivedArrayOfLongs[i])
coordinateArray.append(eventLocation)
print (coordinateArray.count)
}
}
for events in coordinateArray {
let annotation = MKPointAnnotation()
annotation.coordinate = CLLocationCoordinate2D(latitude: events.latitude, longitude: events.longitude)
multiEventMap.addAnnotation(annotation)
}
}
override func viewDidLoad() {
super.viewDidLoad()
manager.delegate = self
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.requestWhenInUseAuthorization()
manager.startUpdatingLocation()
multiPoint()
}
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
multiEventMap.removeFromSuperview()
self.multiEventMap = nil
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}