Ios 如何更改Apple Maps路线上的注释标题

我已使用MKMapItem创建了从a到B的路由，但无法更改地图上批注的标题。我的代码：

CLLocation *locationRestaurante = [[CLLocation alloc] initWithLatitude:[[[listaRestaurante objectAtIndex:0] objectForKey:@"latitude"] floatValue] longitude:[[[listaRestaurante objectAtIndex:0] objectForKey:@"longitude"] floatValue]];

        MKPlacemark *place = [[MKPlacemark alloc] initWithCoordinate:locationRestaurante.coordinate addressDictionary:nil];

        MKMapItem *mapItem = [[MKMapItem alloc]initWithPlacemark:place];

        NSDictionary *options = @{MKLaunchOptionsDirectionsModeKey:MKLaunchOptionsDirectionsModeDriving};

        [mapItem openInMapsWithLaunchOptions:options];

它打开一切都很好。。。但只有一个问题：我无法更改此注释名称：

mapItem.name = @"Place name";