您需要将这些值赋给MKDirectionsRequest的source属性：

myRouteRequest.source = MKMapItem.mapItemForCurrentLocation()

这同样适用于destination：

myRouteRequest.destination = MKMapItem(placemark: myPlacemark)

此外，您在此处有一处打字错误：

myrouteRequest.transportType = .Automobile

它应该是：

myRouteRequest.transportType = .Automobile 
//Capital "R" is probably what you wanted to mean.

• 关于获取预计行程时间和距离：*

我们需要首先创建一个方向请求：

let directions = MKDirections(request: myRouteRequest)

directions.calculateDirectionsWithCompletionHandler
{
    (response, error) -> Void in

    if let routes = response?.routes where response?.routes.count > 0 && error == nil
    {
        let route : MKRoute = routes[0]

        //distance calculated from the request
        print(route.distance) 

        //travel time calculated from the request
        print(route.expectedTravelTime)
    }
}