//当前的位置  
MKMapItem *currentLocation = [MKMapItem mapItemForCurrentLocation];  
//目的地的位置  
MKMapItem *toLocation = [[MKMapItem alloc] initWithPlacemark:[[MKPlacemark alloc] initWithCoordinate:_currentLocationCoordinate addressDictionary:nil]];  
  
toLocation.name = self.addressString;  
  
NSArray *items = [NSArray arrayWithObjects:currentLocation, toLocation, nil nil];  
NSDictionary *options = @{ MKLaunchOptionsDirectionsModeKey:MKLaunchOptionsDirectionsModeDriving, MKLaunchOptionsMapTypeKey: [NSNumber numberWithInteger:MKMapTypeStandard], MKLaunchOptionsShowsTrafficKey:@YES };  
//打开苹果自身地图应用，并呈现特定的item  
[MKMapItem openMapsWithItems:items launchOptions:options];