使用地址字符串/地理编码在地图上的两个注释引脚之间画线。 -目标C

Question

我想根据地址字符串在两个注释引脚之间画一条线。地址标签预先填充了来自用户的数据，可以是美国的任何位置。我已经在每个地址上都有注释，我只是不确定要为坐标数组（纬度、经度）放置什么以便在这两点之间画一条线。我附上了 2 个屏幕截图，以帮助澄清和显示我收到的错误。

以下是我如何注释每个地址：

     NSString *location = [(UILabel *)[[self view] viewWithTag:1]text];;
CLGeocoder *geocoder = [[CLGeocoder alloc] init];
[geocoder geocodeAddressString:location
             completionHandler:^(NSArray* placemarks, NSError* error){
                 if (placemarks && placemarks.count > 0) {
                     CLPlacemark *topResult = [placemarks objectAtIndex:0];
                     MKPlacemark *placemark = [[MKPlacemark alloc] initWithPlacemark:topResult];

                     MKCoordinateRegion region = self.mapView.region;


                     [self.mapView setRegion:region animated:NO];
                     [self.mapView addAnnotation:placemark];
                 }
             }
 ];

NSString *location2 = [(UILabel *)[[self view] viewWithTag:6]text];;
CLGeocoder *geocoder2 = [[CLGeocoder alloc] init];
[geocoder2 geocodeAddressString:location2
             completionHandler:^(NSArray* placemarks, NSError* error){
                 if (placemarks && placemarks.count > 0) {
                     CLPlacemark *topResult = [placemarks objectAtIndex:0];
                     MKPlacemark *placemark = [[MKPlacemark alloc] initWithPlacemark:topResult];

                     MKCoordinateRegion region = self.mapView.region;

                     [self.mapView setRegion:region animated:NO];
                     [self.mapView addAnnotation:placemark];


                 }
             }
 ];

这是我不知道在坐标数组中放置纬度和经度的错误：

      CLLocationCoordinate2D coordinateArray[2];
coordinateArray[0] =  CLLocationCoordinate2DMake(lat1, lon1);<- NEED HELP HERE
coordinateArray[2] = CLLocationCoordinate2DMake(lat2, lon2);<- NEED HELP HERE


self.routeLine = [MKPolyline polylineWithCoordinates:coordinateArray count:2];
[self.mapView setVisibleMapRect:[self.routeLine boundingMapRect]]; //If you want the route to be visible

[self.mapView addOverlay:self.routeLine];

Answer 1

只需更改源和目​​标的坐标即可。

#pragma mark - Show Route Direction

-(void)loadRoute
{
    MKPlacemark *source = [[MKPlacemark alloc]initWithCoordinate:CLLocationCoordinate2DMake(34.0207504,-118.69193) addressDictionary:[NSDictionary dictionaryWithObjectsAndKeys:@"",@"", nil] ];

    MKMapItem *srcMapItem = [[MKMapItem alloc]initWithPlacemark:source];
    [srcMapItem setName:@""];

    MKPlacemark *destination = [[MKPlacemark alloc]initWithCoordinate:CLLocationCoordinate2DMake(37.757815,-122.5076406) 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:MKDirectionsTransportTypeAutomobile];

    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.mapView addOverlay:line];
            NSLog(@"Rout Name : %@",rout.name);
            NSLog(@"Total Distance (in Meters) :%f",rout.distance);

            NSArray *steps = [rout steps];

            NSLog(@"Total Steps : %lu",(unsigned long)[steps count]);

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

            }];
        }];
    }];

}

- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay
{

    if ([overlay isKindOfClass:[MKPolyline class]]) {
        MKPolylineRenderer *renderer = [[MKPolylineRenderer alloc] initWithOverlay:overlay];
        [renderer setStrokeColor:[UIColor blueColor]];
        [renderer setLineWidth:3.0];
        return renderer;
    }
    return nil;
}

Answer 2

您应该只构建一个坐标数组，也许从您要添加到地图的注释数组中填充它。例如：

NSArray <NSString*> *addressStrings = @[@"Los Angeles, CA", @"Chicago, IL"];
CLGeocoder *geocoder = [[CLGeocoder alloc] init];

NSMutableArray <MKPlacemark *> *annotations = [NSMutableArray array];

// first request

[geocoder geocodeAddressString:addressStrings[0] completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
    if (placemarks.count == 0) {
        NSLog(@"didn't annotation for %@", addressStrings[1]);
        return;
    }

    [annotations addObject:[[MKPlacemark alloc] initWithPlacemark:placemarks[0]]];

    // second request

    [geocoder geocodeAddressString:addressStrings[1] completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
        if (placemarks.count == 0) {
            NSLog(@"didn't annotation for %@", addressStrings[1]);
            return;
        }

        [annotations addObject:[[MKPlacemark alloc] initWithPlacemark:placemarks[0]]];

        // when both are done

        CLLocationCoordinate2D coordinates[2];
        coordinates[0] = annotations[0].coordinate;
        coordinates[1] = annotations[1].coordinate;
        MKPolyline *polyline = [MKPolyline polylineWithCoordinates:coordinates count:2];
        [self.mapView addAnnotations:annotations];
        [self.mapView addOverlay:polyline];
        [self.mapView showAnnotations:annotations animated:true];
    }];
}];

当然，这假设您为地图视图设置了相应的委托并实现了rendererForOverlay：

- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay {
    if ([overlay isKindOfClass:[MKPolyline class]]) {
        MKPolylineRenderer *renderer = [[MKPolylineRenderer alloc] initWithPolyline:overlay];
        renderer.lineWidth = 4;
        renderer.strokeColor = [[UIColor cyanColor] colorWithAlphaComponent:0.75];
        return renderer;
    }
    return nil;
}

另请注意，API 规定您不应执行并发地理编码请求，因此我将一个放在另一个的完成处理程序中。