ios - Swift:未安装谷歌地图时应用程序需要打开苹果 map

Question

我为哥本哈根骑自行车的人开发了一个应用程序，但遇到了一些问题。 当 Google map 在手机上不可用时，该应用需要打开 Apple map 。

代码是这样的

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

// VARIABLES!
var locationManager = CLLocationManager()
var M1: GMSMarker!
var M2: GMSMarker!

    //Marker funtioncs
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() {

    // MARKERS
    M1 = GMSMarker()
    M1.position = CLLocationCoordinate2D(latitude: 55.65208178045790, longitude: 12.527047696518300)
    M1.title = "Sjælør St."
    M1.snippet = "Press for navigation"
    M1.map = self.googleMapsView

    M2 = GMSMarker()
    M2.position = CLLocationCoordinate2D(latitude: 55.67530850095370, longitude: 12.583165039072400)
    M2.title = "Børsen (Slotsholmsgade)"
    M2.snippet = "Press for navigation"
    M2.map = self.googleMapsView

        // Marker functions
    markerFunctions = [
        M1: { UIApplication.shared.open(NSURL(string: "comgooglemaps-x-callback://" +
            "?daddr=55.65208178045790,12.527047696518300&directionsmode=bicycling&zoom=17")! as URL)},

        M2: { UIApplication.shared.open(NSURL(string: "comgooglemaps-x-callback://" +
            "?daddr=55.67530850095370,12.583165039072400&directionsmode=bicycling&zoom=17")! as URL)},

当点击信息窗口时，谷歌地图的导航需要出现(它有效)。但是，如果 Google map 应用程序不可用，我该如何重新编写“标记功能”以使其改为打开 Apple map ？

Answer 1

为此，您需要检查是否安装了 Google map 。这可以很容易地完成:

func openMaps(latitude: CLLocationDegrees, longitude: CLLocationDegrees) {
    let googleMapsInstalled = UIApplication.shared.canOpenURL(URL(string: "comgooglemaps://")!)
    if googleMapsInstalled {
        UIApplication.shared.open(URL(string: "comgooglemaps-x-callback://" +
            "?daddr=\(latitude),\(longitude)&directionsmode=bicycling&zoom=17")!)
    } else {
        let coordinates = CLLocationCoordinate2DMake(latitude, longitude)
        let placemark = MKPlacemark(coordinate: coordinates, addressDictionary: nil)
        let mapItem = MKMapItem(placemark: placemark)
        mapItem.openInMaps(launchOptions: nil)
    }
}

出于隐私原因，默认情况下 iOS 不允许检查 URL 是否可以打开。您需要在您的应用中将 comgooglemaps:// 列入白名单检查。为此，将其添加到您的应用 Info.plist:

<key>LSApplicationQueriesSchemes</key>
<array>
    <string>comgooglemaps</string>
</array>

如果您已正确完成此操作，openMaps(latitude:, logitude:) 将打开 Google map (如果已安装)，否则将打开 Apple map 。只需更改闭包(“标记函数”)即可调用新方法。

当然，您还需要import MapKit才能正常工作。