Swift：如何为每个特定标记设置功能？

Question

在以下代码中，我需要将每个特定标记设置为一个函数。如何将功能设置为：点击 MarkerInfoWindow 时，打开 URL？ URL 需要针对每个标记都是特定的。

想法是当 MarkerInfoWindow 被点击为 marker1 时，它应该显示这个 marker1 的导航。

问题是我如何重写此代码以使函数特定于每个标记

标记 1：

let marker1 = GMSMarker()
marker1.position = CLLocationCoordinate2D(latitude: 55.6726299, longitude: 12.5662175)
marker1.title = "Københavns Hovedbanegård"
marker1.snippet = "Press for navigation"
marker1.tracksViewChanges = true
marker1.opacity = 0.9
marker1.icon = UIImage(named: "BCmarker")
marker1.appearAnimation = kGMSMarkerAnimationNone
marker1.map = self.googleMapsView

标记 2：

let marker2 = GMSMarker()
marker2.position = CLLocationCoordinate2D(latitude: 55.68, longitude: 12.55)
marker2.title = "Test Marker2"
marker2.snippet = "Press for navigation"
marker2.tracksViewChanges = true
marker2.opacity = 0.9
marker2.icon = UIImage(named: "BCmarker")
marker2.appearAnimation = kGMSMarkerAnimationNone
marker2.map = self.googleMapsView

每个标记具体应分配的功能：

func mapView(_ mapView: GMSMapView, didTapInfoWindowOf marker: GMSMarker) {
let testURL = URL(string: "comgooglemaps-x-callback://")!
if UIApplication.shared.canOpenURL(testURL) {
    let directionsRequest = "comgooglemaps-x-callback://" +
    "?daddr=55.6726299,12.5662175&directionsmode=walking&zoom=17"

    let directionsURL = URL(string: directionsRequest)!
    UIApplication.shared.openURL(directionsURL)
} else {
    UIApplication.shared.openURL(NSURL(string: "http://maps.apple.com/?address=1600,PennsylvaniaAve.,20500")! as URL)
}

谢谢！

在@Sweeper 的回答之后，代码如下所示： 导入 UIKit 导入谷歌地图 导入 GooglePlaces

class ViewController: UIViewController, CLLocationManagerDelegate, GMSMapViewDelegate, GMSAutocompleteViewControllerDelegate {

// OUTLETS!
@IBOutlet weak var googleMapsView: GMSMapView!

// VARIABLES!
var locationManager = CLLocationManager()

override func viewDidLoad() {
    super.viewDidLoad()

    // GET LOCATION WHILE USING APP
    locationManager = CLLocationManager()
    locationManager.delegate = self
    locationManager.requestWhenInUseAuthorization()
    locationManager.startUpdatingLocation()
    locationManager.startMonitoringSignificantLocationChanges()

    initGoogleMaps()
}


    // START GOOGLE MAPS!
func initGoogleMaps() {

    let zoomCamera = GMSCameraUpdate.zoomIn()
    googleMapsView.animate(with: zoomCamera)

    // Create a GMSCameraPosition that tells the map to display the
    // coordinate -33.86,151.20 at zoom level 6.
    let camera = GMSCameraPosition.camera(withLatitude: 55.6760968, longitude: 12.568337100000008, zoom: 12.5)
    _ = GMSMapView.map(withFrame: CGRect.zero, camera: camera)
    self.googleMapsView.camera = camera

    // CREATE FIND LOCATION BUTTON??
    self.googleMapsView.delegate = self
    self.googleMapsView.isMyLocationEnabled = true
    self.googleMapsView.settings.myLocationButton = true

    // MARKERS
    let marker1 = GMSMarker()
    marker1.position = CLLocationCoordinate2D(latitude: 55.6726299, longitude: 12.5662175)
    marker1.title = "Københavns Hovedbanegård"
    marker1.snippet = "Tryk for at få navigation"
    marker1.tracksViewChanges = true
    marker1.opacity = 0.9
    marker1.icon = UIImage(named: "BCmarker")
    marker1.appearAnimation = kGMSMarkerAnimationNone
    marker1.map = self.googleMapsView

    let marker2 = GMSMarker()
    marker2.position = CLLocationCoordinate2D(latitude: 55.68, longitude: 12.55)
    marker2.title = "Test Marker2"
    marker2.snippet = "Tryk for at få navigation"
    marker2.tracksViewChanges = true
    marker2.opacity = 0.9
    marker2.icon = UIImage(named: "BCmarker")
    marker2.appearAnimation = kGMSMarkerAnimationNone
    marker2.map = self.googleMapsView

    let markerFunctions: [GMSMarker: (() -> Void)] = [
        marker1: { print("Test1") },
            marker2: { print("Test2") }
    ]

}

// ...something else about Google Places

Answer 1

mapView(_ mapView: GMSMapView, didTapInfoWindowOf marker: GMSMarker) 将在 任何 标记的信息窗口被点击时被调用。您希望获得一个仅在点击 特定 标记的信息窗口时才会调用的特定标记。希望我正确理解了您的问题。

很遗憾，Google Maps API 中没有这样的委托方法。

好吧，简单的解决方法就是使用 if 语句来检查它是 marker1 还是 marker2：

func mapView(_ mapView: GMSMapView, didTapInfoWindowOf marker: GMSMarker) {
    if marker == marker1 { // remember to declare marker 1 and 2 at class level!
        // do stuff
    } else if marker == marker2 {
        // do other stuff
    }
}

或者，您可以将您希望每个标记执行的操作放入字典中：

let markerFuntions: [GMSMarker: (() -> Void)] = [
    marker1: { // do stuff }
    marker2: { // do other stuff }
]

然后您可以像这样编写委托方法：

func mapView(_ mapView: GMSMapView, didTapInfoWindowOf marker: GMSMarker) {
    markerFunctions[marker]?()
}

编辑：我试图解决你的代码的问题，这就是我得到的：

class ViewController: UIViewController, CLLocationManagerDelegate, GMSMapViewDelegate, GMSAutocompleteViewControllerDelegate {

// OUTLETS!
@IBOutlet weak var googleMapsView: GMSMapView!

// VARIABLES!
var locationManager = CLLocationManager()
var marker1: GMSMarker!
var marker2: GMSMarker!
var markerFunctions: [GMSMarker: (() -> Void)]!

override func viewDidLoad() {
    super.viewDidLoad()

    // GET LOCATION WHILE USING APP
    locationManager = CLLocationManager()
    locationManager.delegate = self
    locationManager.requestWhenInUseAuthorization()
    locationManager.startUpdatingLocation()
    locationManager.startMonitoringSignificantLocationChanges()

    initGoogleMaps()
}


    // START GOOGLE MAPS!
func initGoogleMaps() {

    let zoomCamera = GMSCameraUpdate.zoomIn()
    googleMapsView.animate(with: zoomCamera)

    // Create a GMSCameraPosition that tells the map to display the
    // coordinate -33.86,151.20 at zoom level 6.
    let camera = GMSCameraPosition.camera(withLatitude: 55.6760968, longitude: 12.568337100000008, zoom: 12.5)
    _ = GMSMapView.map(withFrame: CGRect.zero, camera: camera)
    self.googleMapsView.camera = camera

    // CREATE FIND LOCATION BUTTON??
    self.googleMapsView.delegate = self
    self.googleMapsView.isMyLocationEnabled = true
    self.googleMapsView.settings.myLocationButton = true

    // MARKERS
    marker1 = GMSMarker()
    marker1.position = CLLocationCoordinate2D(latitude: 55.6726299, longitude: 12.5662175)
    marker1.title = "Københavns Hovedbanegård"
    marker1.snippet = "Tryk for at få navigation"
    marker1.tracksViewChanges = true
    marker1.opacity = 0.9
    marker1.icon = UIImage(named: "BCmarker")
    marker1.appearAnimation = kGMSMarkerAnimationNone
    marker1.map = self.googleMapsView

    marker2 = GMSMarker()
    marker2.position = CLLocationCoordinate2D(latitude: 55.68, longitude: 12.55)
    marker2.title = "Test Marker2"
    marker2.snippet = "Tryk for at få navigation"
    marker2.tracksViewChanges = true
    marker2.opacity = 0.9
    marker2.icon = UIImage(named: "BCmarker")
    marker2.appearAnimation = kGMSMarkerAnimationNone
    marker2.map = self.googleMapsView

    markerFunctions = [
        marker1: { print("Test1") },
        marker2: { print("Test2") }
    ]

}

func mapView(_ mapView: GMSMapView, didTapInfoWindowOf marker: GMSMarker) {
    markerFunctions[marker]?()
}

// ...something else about Google Places