Swift - MapKit - 如何画一条线

Question

Xcode 11.1、斯威夫特 4

如何在 Swift 中使用 Mapkit 在三个位置（点）之间画一条线？

let london = Capital(title: "London", coordinate: CLLocationCoordinate2D(latitude: 51.507222, longitude: -0.1275), info: "Home to the 2012 Summer Olympics.")

let oslo = Capital(title: "Oslo", coordinate: CLLocationCoordinate2D(latitude: 59.95, longitude: 10.75), info: "Founded over a thousand years ago.")

谢谢

Answer 1

要连接任意数量的点，您可以使用MKPolyline它及其MKPolylineRenderer视图。首先，将叠加层添加到地图中，然后在委托方法中为视图提供折线的视觉设置：

import UIKit
import MapKit

struct Capital {
  let title: String
  let coordinate: CLLocationCoordinate2D
  let info: String
}

class ViewController: UIViewController, MKMapViewDelegate {

  @IBOutlet var mapView: MKMapView!

  override func viewDidLoad() {
    super.viewDidLoad()

    mapView.delegate = self

    let london = Capital(title: "London", coordinate: CLLocationCoordinate2D(latitude: 51.507222, longitude: -0.1275), info: "Home to the 2012 Summer Olympics.")
    let oslo = Capital(title: "Oslo", coordinate: CLLocationCoordinate2D(latitude: 59.95, longitude: 10.75), info: "Founded over a thousand years ago.")

    mapView.addOverlay(MKPolyline(coordinates: [london.coordinate, oslo.coordinate], count: 2))
  }

  func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
    let polylineRenderer = MKPolylineRenderer(polyline: overlay as! MKPolyline)
    polylineRenderer.strokeColor = UIColor.black
    polylineRenderer.lineWidth = 4.0
    return polylineRenderer
  }
}

这是上面代码的结果：