swift 调用系统导航

import UIKit
import MapKit
class MapViewController: UIViewController{
 lazy var geoCoder: CLGeocoder = {
    return CLGeocoder()
    }()
/**
     开始导航
 初始化一个我的位置MKMapItem，我要到的位置toMKPlacemark
   */
 func StartNavigationBtn {
    let currentLocation: MKMapItem = MKMapItem.mapItemForCurrentLocation()//我的位置
    let toCoor:CLLocationCoordinate2D = CLLocationCoordinate2D(latitude: 30.0, longitude: 30.0)
    let toMKPlacemark: MKPlacemark = MKPlacemark.init(coordinate: toCoor, addressDictionary: nil)
    let toLocation: MKMapItem = MKMapItem.init(placemark: toMKPlacemark)
    toLocation.name = "去的地方";
    let dic: [String : AnyObject] = [// 导航设置字典
        MKLaunchOptionsDirectionsModeKey: MKLaunchOptionsDirectionsModeDriving,// 导航模式
        MKLaunchOptionsMapTypeKey: MKMapType.Standard.rawValue,// 地图样式
        MKLaunchOptionsShowsTrafficKey: true// 显示交通
    ]
    MKMapItem .openMapsWithItems([currentLocation,toLocation], launchOptions: dic)
}
}