Handle_map_events

Events

The Bing Maps API provides events that allow your application to respond to user actions.

Examples

Map holding event

The following example shows how to add a pushpin when a user holds their finger on the map.

Swift

mapView.addUserIsHoldingHandler{ (point:CGPoint, location:MSGeopoint?) -> Bool in
    if (location != nil) {
        let pushpin = MSMapIcon()
        pushpin.location = location
        self.pinLayer.elements.add(pushpin)
        return true
    }
   return false
}

Map tapped event

The following example shows how to change a MapIcon image and z index of the containing layer when a pusphin is tapped.

Swift

First, add an extension for MSMapElementCollection to conform to the Sequence Protocol in order to use a for-in loop.

// This will allow for-in works on MSMapElementCollection.elements
extension MSMapElementCollection: Sequence {
    public func makeIterator() -> NSFastEnumerationIterator {
        return NSFastEnumerationIterator(self)
    }
}

Second, add the following methods and variables to UIViewController:

// Create two layers in ViewController
private var buildingsLayer: MSMapElementLayer!
private var cityParksLayer: MSMapElementLayer!

// Create and add pushpin to building locations in  building layer
func createCityBuildingsCollection() {
    buildingsLayer = MSMapElementLayer()
    let pushpin = MSMapIcon()
    pushpin.location = MSGeopoint(latitude: 47.603830, longitude: -122.329900)
    pushpin.title = "Seattle City Hall"
    buildingsLayer.elements.add(pushpin)
    let pushpin2 = MSMapIcon()
    pushpin2.location = MSGeopoint(latitude: 47.606709, longitude:  -122.332672)
    pushpin2.title = "Seattle Public Library"
    buildingsLayer.elements.add(pushpin2)
    let pushpin3 = MSMapIcon()
    pushpin3.location = MSGeopoint(latitude: 47.604100, longitude:  -122.329204)
    pushpin3.title = "Municipal Court of Seattle"
    buildingsLayer.elements.add(pushpin3)
}

// Create and add pusphin to city park locaiton in city parks layer
func createCityParksCollection() {
    cityParksLayer = MSMapElementLayer()
    let pushpin = MSMapIcon()
    pushpin.location = MSGeopoint(latitude: 47.608313, longitude: -122.331218)
    pushpin.title = "Freeway Park"
    cityParksLayer.elements.add(pushpin)
    let pushpin2 = MSMapIcon()
    pushpin2.location = MSGeopoint(latitude: 47.602029, longitude:  -122.333971)
    pushpin2.title = "Pioneer Square"
    cityParksLayer.elements.add(pushpin2)
    let pushpin3 = MSMapIcon()
    pushpin3.location = MSGeopoint(latitude: 47.601990, longitude:  -122.330681)
    pushpin3.title = "City Hall Park"
    cityParksLayer.elements.add(pushpin3)
    let pushpin4 = MSMapIcon()
    pushpin4.location = MSGeopoint(latitude: 47.600619, longitude:  -122.324957)
    pushpin4.title = "Kobe Terrace Park"
    cityParksLayer.elements.add(pushpin4)
}

// Change z index of layer and icon images
func selectLayer(selectedLayer: MSMapElementLayer) {
    var deselectedLayer: MSMapElementLayer
    if selectedLayer == buildingsLayer {
        deselectedLayer = cityParksLayer
    }
    else {
        deselectedLayer = buildingsLayer
    }

    deselectedLayer.zIndex = 0
    for element in deselectedLayer.elements {
        let mapIcon = element as! MSMapIcon
        mapIcon.image = MSMapImage(uiImage:UIImage(named: "selectedMappin")!)
    }

    selectedLayer.zIndex = 0
    for element in selectedLayer.elements {
        let mapIcon = element as! MSMapIcon
        mapIcon.image = MSMapImage(uiImage:UIImage(named: "defaultMappin")!)
    }
}

Finally add the buildings/parks layer to the map and implement the handler for a user tapped interaction.

override func viewDidLoad() {

    createCityBuildingsCollection();
    createCityParksCollection();
    mapView.layers.add(buildingsLayer)
    mapView.layers.add(cityParksLayer)
    mapView.addUserDidTapHandler { (point:CGPoint, location:MSGeopoint?) -> Bool in
        let tappedElements = self.mapView.findMapElements(atOffset: point)
        if tappedElements.isEmpty {
            return false
        }

        let mapIcon = tappedElements.first as? MSMapIcon
        if mapIcon == nil {
            return false
        }

        if self.buildingsLayer.elements.contains(where: tappedElements[0]) {
            self.selectLayer(selectedLayer: self.buildingsLayer)
        }
        else{
            self.selectLayer(selectedLayer: self.cityParksLayer)
        }
        return true
    }
}