MKdirections在两个给定点之间绘制路线

Question

我正在使用本教程制作示例应用程序.它使用填充了包含位置的JSon文件的表视图.在详细视图中,它使用Map并为表列表视图中选择的位置放置一个引脚.

我的问题是如何绘制当前用户位置之间的路线作为起点和"位置"位置作为目的地？

我现在在我的地图上有2个引脚:1)当前位置和2)目的地但我不知道如何将它们与路线相关联.使用这两个参数打开默认地图应用程序不是一个选项.

每个答案都要提前感谢.

Answer 1

使用以下代码:

     MKPlacemark *source = [[MKPlacemark   alloc]initWithCoordinate:CLLocationCoordinate2DMake(sourceLatitude, sourceLongitude)   addressDictionary:[NSDictionary dictionaryWithObjectsAndKeys:@"",@"", nil] ];
     MKMapItem *srcMapItem = [[MKMapItem alloc]initWithPlacemark:source];
    [srcMapItem setName:@""];

    MKPlacemark *destination = [[MKPlacemark alloc]initWithCoordinate:CLLocationCoordinate2DMake(destinationLatitude, destinationLongitude) addressDictionary:[NSDictionary dictionaryWithObjectsAndKeys:@"",@"", nil] ];

    MKMapItem *distMapItem = [[MKMapItem alloc]initWithPlacemark:destination];
    [distMapItem setName:@""];

    MKDirectionsRequest *request = [[MKDirectionsRequest alloc]init];
    [request setSource:srcMapItem];
    [request setDestination:distMapItem];
    [request setTransportType:MKDirectionsTransportTypeWalking];

    MKDirections *direction = [[MKDirections alloc]initWithRequest:request];

    [direction calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) {

        NSLog(@"response = %@",response);
        NSArray *arrRoutes = [response routes];
        [arrRoutes enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {

            MKRoute *rout = obj;

            MKPolyline *line = [rout polyline];
            [self.mkMapView addOverlay:line];
            NSLog(@"Rout Name : %@",rout.name);
            NSLog(@"Total Distance (in Meters) :%f",rout.distance);

            NSArray *steps = [rout steps];

            NSLog(@"Total Steps : %d",[steps count]);

            [steps enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
                NSLog(@"Rout Instruction : %@",[obj instructions]);
                NSLog(@"Rout Distance : %f",[obj distance]);
            }];
        }];
    }];

有关更多信息,您可以查看Apple的文档.