iOS 6地图-找不到方向

Question

我正在尝试将我的用户定向到iOS 6原生地图，以获得从他们的当前位置到纬度和经度位置的方向，如下所示：

MKPlacemark *placemark = [[MKPlacemark alloc] initWithCoordinate:placeLocation addressDictionary:nil];
MKMapItem *destination = [[MKMapItem alloc] initWithPlacemark:placemark];
MKMapItem *currentLocation = [MKMapItem mapItemForCurrentLocation];
NSArray *mapItems = @[destination, currentLocation];
NSDictionary *options = @{MKLaunchOptionsDirectionsModeKey:MKLaunchOptionsDirectionsModeDriving, MKLaunchOptionsMapTypeKey: [NSNumber numberWithInteger:MKMapTypeStandard], MKLaunchOptionsShowsTrafficKey:@YES};
[MKMapItem openMapsWithItems:mapItems launchOptions:options];

我已将模拟器设置为我的纬度和经度。这里我的代码出了什么问题？

Answer 1

代码很好，只要有一条可能的路线，我就能正常工作。

当可以给出currentLocation和目的地之间的方向时起作用。如果currentLocation在美国，地图就会失败，因为它不能从德国导航到美国。但如果currentLocation也在欧洲，地图应用程序就可以正常工作:)

//placeMarkCoord fixed to germany
MKPlacemark *placemark = [[MKPlacemark alloc] initWithCoordinate:CLLocationCoordinate2DMake(51.0, 10.0) addressDictionary:nil];
MKMapItem *destination = [[MKMapItem alloc] initWithPlacemark:placemark];

//currentLocation must be reachable from destination!
//MKMapItem *currentLocation = [MKMapItem mapItemForCurrentLocation];
placemark = [[MKPlacemark alloc] initWithCoordinate:CLLocationCoordinate2DMake(51.0, 11.0) addressDictionary:nil];
MKMapItem *currentLocation = [[MKMapItem alloc] initWithPlacemark:placemark];

NSArray *mapItems = @[destination, currentLocation];
NSDictionary *options = @{MKLaunchOptionsDirectionsModeKey:MKLaunchOptionsDirectionsModeDriving, MKLaunchOptionsMapTypeKey: [NSNumber numberWithInteger:MKMapTypeStandard], MKLaunchOptionsShowsTrafficKey:@YES};
[MKMapItem openMapsWithItems:mapItems launchOptions:options];