如何使用 Swift 启用 Google 地图缩放控件

Question

我正在阅读 Google Maps for swift 的文档，但与 Android 相比，我没有找到在地图上设置“缩放控件”的方法，并且默认情况下处于禁用状态。

是否存在使用

Google Maps iOS SDK

显示控件的方法？

Answer 1

我认为@Scriptable是对的，文档中没有针对

Zoom Controls

的部分。嗯，我制作了自己的（非常基本的）控件。

保持这个顺序（

iOS SDK

，

MapView

，

Button

），否则，你看不到按钮。

第一个，您必须选择您的

Button

并将班级更改为

UIVIew

并且，在

GSMMapView

MapViewController

Answer 2

要解决这个问题，您应该在此处捕获缩放值（在 GMSMapViewDelegate 中）

import Foundation
import UIKit
import GoogleMaps

class MapViewController: UIViewController {

    struct Place {
        let id: Int
        let name: String
        let lat: CLLocationDegrees
        let lng: CLLocationDegrees
        let icon: String
    }

    @IBOutlet weak var mapView: GMSMapView!
    var markerDict: [Int: GMSMarker] = [:]

    var zoom: Float = 15

    override func viewDidLoad() {
        super.viewDidLoad()

        let camera = GMSCameraPosition.camera(withLatitude: 34.1381168, longitude: -118.3555723, zoom: zoom)
        self.mapView.camera = camera

        do {
            if let styleURL = Bundle.main.url(forResource: "style", withExtension: "json") {
                mapView.mapStyle = try GMSMapStyle(contentsOfFileURL: styleURL)
            } else {
                NSLog("Unable to find style.json")
            }
        } catch {
            NSLog("One or more of the map styles failed to load. \(error)")
        }

        let places = [
            Place(id: 0, name: "MrMins", lat: 34.1331168, lng: -118.3550723, icon: "i01"),
        ]

        for place in places {
            let marker = GMSMarker()
            marker.position = CLLocationCoordinate2D(latitude: place.lat, longitude: place.lng)
            marker.title = place.name
            marker.snippet = "Custom snipet message \(place.name)"
            marker.appearAnimation = kGMSMarkerAnimationPop
            //marker.icon = self.imageWithImage(image: UIImage(named: place.icon)!, scaledToSize: CGSize(width: 35.0, height: 35.0))
            marker.map = self.mapView

            markerDict[place.id] = marker
        }

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }



    @IBAction func btnZoomIn(_ sender: Any) {
        zoom = zoom + 1
        self.mapView.animate(toZoom: zoom)
    }

    @IBAction func btnZoomOut(_ sender: Any) {
        zoom = zoom - 1
        self.mapView.animate(toZoom: zoom)
    }


}

所有代码都会像这样

func mapView(_ mapView: GMSMapView, didChange position: GMSCameraPosition) {
    zoom = mapView.camera.zoom
}

Answer 3

    class A: UIViewController {
      var zoom: Float = 15

    @IBAction func ZoomInButtonPressed(_ sender: UIButton) {
        let nextZoom = zoom + 1
        mapView.animate(toZoom: nextZoom)
    }
}

extension A: GMSMapViewDelegate { 
    func mapView(_ mapView: GMSMapView, didChange position: GMSCameraPosition) {
        zoom = mapView.camera.zoom
    }
}

更多信息请查看本文。

https://support.google.com/maps/answer/6396990?hl=en&co=GENIE.Platform%3DiOS