objective-c – 向MKMapView添加多个叠加层

我有跟踪的阵列路线.跟踪的路由是CLLocations数组.所以我有一个数组数组.

我可以采取一条路线并在地图视图上绘制它.但是,我需要将所有路径绘制到地图视图中.

以下是我如何为1条路线创建MKPolyline：

-(void) loadRoute
{
    //So we grab an array that holds all the locations of one route. 
            NSArray *locations = [[NSArray alloc] initWithArray:[routesArray objectAtIndex:0]];

            // while we create the route points,we will also be calculating the bounding box of our route
            // so we can easily zoom in on it. 
            MKMapPoint northEastPoint; 
            MKMapPoint southWestPoint; 

            // create a c array of points. 
            MKMapPoint* pointArr = malloc(sizeof(CLLocationCoordinate2D) *[locations count]);

            for(int idx = 0; idx < [locations count]; idx++)
            {
                CLLocation *tempLoc = (CLLocation*)[locations objectAtIndex:idx];

                CLLocationDegrees latitude  = tempLoc.coordinate.latitude;
                CLLocationDegrees longitude = tempLoc.coordinate.longitude;

                // create our coordinate and add it to the correct spot in the array 
                CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(latitude,longitude);

                MKMapPoint point = MKMapPointForCoordinate(coordinate);

                // if it is the first point,just use them,since we have nothing to compare to yet. 
                if (idx == 0) {
                    northEastPoint = point;
                    southWestPoint = point;
                }
                else 
                {
                    if (point.x > northEastPoint.x) 
                        northEastPoint.x = point.x;
                    if(point.y > northEastPoint.y)
                        northEastPoint.y = point.y;
                    if (point.x < southWestPoint.x) 
                        southWestPoint.x = point.x;
                    if (point.y < southWestPoint.y) 
                        southWestPoint.y = point.y;
                }
                pointArr[idx] = point;
            }


            self.routeLine = [MKPolyline polylineWithPoints:pointArr count:[locations count]];

//Zoom in to fit route on screen
            _routeRect = MKMapRectMake(southWestPoint.x,southWestPoint.y,northEastPoint.x - southWestPoint.x,northEastPoint.y - southWestPoint.y);

            // clear the memory allocated earlier for the points
            free(pointArr);

}

这是返回叠加层的MapKit委托调用：

#pragma mark MKMapViewDelegate

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
    MKOverlayView* overlayView = nil;

    if(overlay == self.routeLine)
    {
        //if we have not yet created an overlay view for this overlay,create it now. 
        if(nil == self.routeLineView)
        {
            self.routeLineView = [[MKPolylineView alloc] initWithPolyline:self.routeLine];
            self.routeLineView.fillColor = [UIColor redColor];
            self.routeLineView.strokeColor = [UIColor redColor];
            self.routeLineView.lineWidth = 3;
        }
        overlayView = self.routeLineView;
    }

    return overlayView;
}

所以上面给出的所有代码都可以.我无法弄清楚如何加载更多叠加来显示其他路线.

我认为可能在loadRoute方法中,运行所有路由并为每个路由创建MKOverlayView.将所有MKOverlayView存储在一个数组中然后执行：
[self.mapView addOverlays：array];

但它不起作用.问题是在委托方法中我不知何故需要知道返回哪个叠加层.

所以,如果我可以做的事情：

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
    int tag = overlay.tag;
    return (MKOverlayView*)[arrayOfViews objectAtIndex:tag];
}

它会工作正常.但不幸的是它不像那样:(

任何帮助将非常感谢！

编辑：

我在ViewDidLoad中使用它来添加叠加层：

[self loadRoute];

        // add the overlay to the map
        if (nil != self.routeLine) {
            [self.mapView addOverlay:self.routeLine];
        }

        // zoom in on the route. 
        [self zoomInOnRoute];

这是在标题中：

// the data representing the route points. 
    MKPolyline* _routeLine;

    // the view we create for the line on the map
    MKPolylineView* _routeLineView;

    // the rect that bounds the loaded points
    MKMapRect _routeRect;