ios - Swift - MKPointAnnotation 自定义图钉图像

Question

我使用的是 Swift 3 和 Xcode 10 beta 3，我需要为 map 上的图钉使用自定义图像。我需要避免使用红色注释图钉并使用我为此制作的一些自定义 Logo 。我尝试了在堆栈上找到的所有解决方案，但没有任何帮助。这是我的代码:

import UIKit
import MapKit

class ViewController: UIViewController, CLLocationManagerDelegate {
    @IBOutlet weak var map: MKMapView!

    var locationManager: CLLocationManager!

    override func viewDidLoad() {
        super.viewDidLoad()
        self.locationManager = CLLocationManager()
        self.locationManager.requestAlwaysAuthorization()
        self.locationManager.startUpdatingLocation()

        //let span:MKCoordinateSpan = MKCoordinateSpanMake(0.1, 0.1)
        let locationANTOMI:CLLocationCoordinate2D = CLLocationCoordinate2DMake(45.4509339, 9.1713609)
        let locationANTOTO:CLLocationCoordinate2D = CLLocationCoordinate2DMake(45.06666, 7.68826)
        //let region:MKCoordinateRegion = MKCoordinateRegionMake(location, span)
        //map.setRegion(region, animated: true)
        let annotationANTOMI = MKPointAnnotation()
        annotationANTOMI.coordinate = locationANTOMI
        annotationANTOMI.title = "ANTONIOLI MILANO"

        map.addAnnotation(annotationANTOMI)

        let annotationANTOTO = MKPointAnnotation()
        annotationANTOTO.coordinate = locationANTOTO
        annotationANTOTO.title = "ANTONIOLI TORINO"
        map.addAnnotation(annotationANTOTO)
    }
}

我应该怎么做？

Answer 1

我通常这样做的方式是创建一个新的 swift 文件，它将成为您继承自 MKAnnoatation 的自定义注释。下面的例子

import MapKit

class MyAnnotation: NSObject, MKAnnotation {
    let title: String?
    let subtitle: String?
    let coordinate: CLLocationCoordinate2D
    var image: UIImage? = nil

    init(title: String, subtitle: String, coordinate: CLLocationCoordinate2D) {
        self.title = title
        self.subtitle = subtitle
        self.coordinate = coordinate
        //self.image
        super.init()
    }
}

您需要在 CLCoordinate 是强制性的地方初始化您的注释。然后使用您的自定义图像设置图像属性。 MyAnnotation.image = "myImage.png"。然后，您需要将注释添加到 map View mapView.addAnnotations(MyAnnotation)。 我还从 MKMapViewDelegate 中实现了下面的方法(确保你在你的类中继承了它)。这是为了让用户可以点击注释并接收有关它的信息。希望这会有所帮助。

在你的 View Controller 中:

let marker = MyAnnotation(title: "title" as! String, subtitle: "subtitle" as! String, coordinate: CLLocationCoordinate2D(latitude: latitude, longitude: longitude))
marker.image = UIImage("my image.png")
self.mapView.addAnnotations(marker)

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
    if let annotation = annotation as? MyAnnotation {
        let identifier = "identifier"
        annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: identifier)
        annotationView?.image = annotation.image //add this
        annotationView?.canShowCallout = true
        annotationView?.calloutOffset = CGPoint(x: -5, y: 5)
        annotationView?.rightCalloutAccessoryView = UIButton(type: .detailDisclosure) as UIView
        return annotationView
    }
    return nil
}