openInMapsWithLaunchOptions not working?

Question

I'm passing in options for the map, but this does not seem to do anything with the zoom level?? It keeps the same low zoom level. What have I missed?

func openMapForPlace() {
    let regionDistance:CLLocationDistance = 10000
    var coordinates = CLLocationCoordinate2DMake(detailItem!.geoLatitude, detailItem!.geoLongitude)
    let regionSpan = MKCoordinateRegionMakeWithDistance(coordinates, regionDistance, regionDistance)
    var options = [
        MKLaunchOptionsMapCenterKey: NSValue(MKCoordinate: regionSpan.center),
        MKLaunchOptionsMapSpanKey: NSValue(MKCoordinateSpan: regionSpan.span)
    ]
    var placemark = MKPlacemark(coordinate: coordinates, addressDictionary: nil)
    var mapItem = MKMapItem(placemark: placemark)
    mapItem.name = detailItem!.cityName
    mapItem.openInMapsWithLaunchOptions(options)
}

Answer 1

Apple's documentation does not mention it but from testing, it seems like openInMapsWithLaunchOptions() seems to ignore the MKLaunchOptionsMapSpanKey option if one or more MKMapItem are added to the map.

The following code works as expected, with the map zoom being adjusted properly when the distance parameter is modified (try with 1000 and 10000000, to see the difference):

func openMapForPlace() {
    let regionDistance: CLLocationDistance = 10000000
    let coordinates = CLLocationCoordinate2DMake(40, 0)
    let regionSpan = MKCoordinateRegionMakeWithDistance(coordinates, regionDistance, regionDistance)
    let options = [
        MKLaunchOptionsMapCenterKey: NSValue(MKCoordinate: regionSpan.center),
        MKLaunchOptionsMapSpanKey: NSValue(MKCoordinateSpan: regionSpan.span)
    ]

    MKMapItem.openMapsWithItems([], launchOptions: options)
}

However, as soon as one MKMapItem is added to the map, the zoom stops working.

func openMapForPlace() {
    let regionDistance: CLLocationDistance = 10000000
    let coordinates = CLLocationCoordinate2DMake(40, 0)
    let regionSpan = MKCoordinateRegionMakeWithDistance(coordinates, regionDistance, regionDistance)
    let options = [
        MKLaunchOptionsMapCenterKey: NSValue(MKCoordinate: regionSpan.center),
        MKLaunchOptionsMapSpanKey: NSValue(MKCoordinateSpan: regionSpan.span)
    ]

    let placemark = MKPlacemark(coordinate: coordinates, addressDictionary: nil)
    let mapItem = MKMapItem(placemark: placemark)
    mapItem.name = "Test"

    MKMapItem.openMapsWithItems([mapItem], launchOptions: options)
}