Swift:未安装Google地图时,应用需要打开Apple地图

Question

我为哥本哈根的自行车手制作了一个应用程序,但遇到了一些麻烦.当手机上没有Google地图时,该应用需要打开Apple地图.

代码看起来像这样

// 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)},

点击信息窗口时,需要显示Google地图导航(可以使用).但是,如果谷歌地图应用程序不可用,我该如何重新编写"标记功能",以便它将打开我的Apple地图？

Answer 1

为此,您需要检查是否已安装Google地图.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)
    }
}

默认情况下,iOS不允许检查是否可以出于隐私原因打开URL.您需要comgooglemaps://在应用中将检查列入白名单.为此,请将此添加到您的应用中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Goog​​le地图(如果已安装),否则将打开Apple地图.只需更改闭包("标记功能")即可调用新方法.

当然,你也需要import MapKit为此工作.