NSString *string = @"http://maps.apple.com/maps?saddr=39.98,116.31&daddr=41.59,117.40";
[[UIApplication sharedApplication]  openURL:[NSURL URLWithString:string]];

ios6以下我們一般用google地圖來導航，但ios6中呼叫會有點問題，會開啟web瀏覽器再詢問之類的，不直觀友好。所以在ios6中建議直接用apple map。本來呼叫apple map應該和呼叫google map類似，但使用：

使用maps://saddr=%f,%f&daddr=%f,%f 會找不到當前位置，也不清楚原因？

不過還是找到了解決方法，如下（包括兩種地圖呼叫方式）

但是有時候會有問題
if (SYSTEM_VERSION_LESS_THAN(@”6.0”)) { // ios6以下，呼叫google map
NSString *urlString = [[NSString alloc]
initWithFormat:@”http://maps.google.com/maps?saddr=%f,%f&daddr=%f,%f&dirfl=d“,
cutLat,cutLon,stationLat,stationLon];
NSURL *aURL = [NSURL URLWithString:urlString];
[urlString release];
[[UIApplication sharedApplication] openURL:aURL];
} else { // 直接呼叫ios自己帶的apple map
CLLocationCoordinate2D to;
to.latitude = stationLat;
to.longitude = stationLon;
MKMapItem *currentLocation = [MKMapItem mapItemForCurrentLocation];
MKMapItem *toLocation = [[MKMapItem alloc] initWithPlacemark:[[[MKPlacemark alloc] initWithCoordinate:to addressDictionary:nil] autorelease]];
toLocation.name = @”Destination”;
[MKMapItem openMapsWithItems:[NSArray arrayWithObjects:currentLocation, toLocation, nil] launchOptions:[NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:MKLaunchOptionsDirectionsModeDriving, [NSNumber numberWithBool:YES], nil] forKeys:[NSArray arrayWithObjects:MKLaunchOptionsDirectionsModeKey, MKLaunchOptionsShowsTrafficKey, nil]]];
[toLocation release];
}

define

SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice
currentDevice]
systemVersion]
compare:v
options:NSNumericSearch] ==
NSOrderedAscending)