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POMKMapView Delegate Methods not working
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copied!<p>I just wanted to add a Polyline to my Map which is displayed in a tableviewcell. Unfortunately the delegate methods are not called... Would be nice if someone knows why.</p> <p>My tableview.h:</p> <pre><code>#import <UIKit/UIKit.h> #import "Route.h" #import <MapKit/MapKit.h> #import <QuartzCore/QuartzCore.h> @interface RoutesDetailView : UITableViewController<MKMapViewDelegate>{ Route *myRoute; MKMapView *mapView; // the view we create for the line on the map MKPolylineView* _routeLineView; // the rect that bounds the loaded points MKMapRect _routeRect; MKPolyline* _routeLine; } @property (nonatomic, retain) Route *myRoute; @property (nonatomic,retain) MKMapView *mapView; @property (nonatomic, retain) MKPolyline* routeLine; @property (nonatomic, retain) MKPolylineView* routeLineView; -(MKPolyline *) loadRoute: (Route *) theRoute; @end </code></pre> <p>And my tableview.m:</p> <pre><code> @implementation RoutesDetailView @synthesize myRoute,mapView; @synthesize routeLine = _routeLine; @synthesize routeLineView = _routeLineView; - (id)initWithStyle:(UITableViewStyle)style { self = [super initWithStyle:style]; if (self) { // Custom initialization } return self; } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } #pragma mark - View lifecycle - (void)viewDidLoad { [super viewDidLoad]; MKMapView *myMap = [[MKMapView alloc] initWithFrame:CGRectMake(10, 1, 300 , 300)]; myMap.layer.cornerRadius = 10.0; [self setMapView:myMap]; [mapView setDelegate:self]; CLLocationCoordinate2D annotationCoord; annotationCoord.latitude = [[NSString stringWithFormat:@"%@",NSLocalizedString(@"DefaultPointLAT", nil)] doubleValue]; annotationCoord.longitude = [[NSString stringWithFormat:@"%@",NSLocalizedString(@"DefaultPointLONG", nil)] doubleValue]; MKPointAnnotation *annotationPoint = [[MKPointAnnotation alloc] init]; annotationPoint.coordinate = annotationCoord; MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance (annotationPoint.coordinate,[[NSString stringWithFormat:@"%@",NSLocalizedString(@"DefaultCircle", nil)] doubleValue], [[NSString stringWithFormat:@"%@",NSLocalizedString(@"DefaultCircle", nil)] doubleValue]); [mapView setRegion:region animated:NO]; // Uncomment the following line to preserve selection between presentations. // self.clearsSelectionOnViewWillAppear = NO; // Uncomment the following line to display an Edit button in the navigation bar for this view controller. // self.navigationItem.rightBarButtonItem = self.editButtonItem; } - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; } - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; } - (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; } - (void)viewDidDisappear:(BOOL)animated { [super viewDidDisappear:animated]; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations return (interfaceOrientation == UIInterfaceOrientationPortrait); } #pragma mark - Table view data source - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { . . . static NSString *CellIdentifier = @"CellMap"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; [mapView setFrame:CGRectMake(10, 1, cell.frame.size.width-20 , cell.frame.size.height-1)]; [cell addSubview:mapView]; [mapView addOverlay:[self loadRoute:myRoute]]; return cell; . . . } #pragma mark - Table view delegate -(MKPolyline *) loadRoute: (Route *) theRoute { MKMapPoint northEastPoint; MKMapPoint southWestPoint; // create a c array of points. MKMapPoint* pointArr = malloc(sizeof(CLLocationCoordinate2D) * theRoute.latitude.count); for(int idx = 0; idx < theRoute.latitude.count; idx++) { CLLocationDegrees latitude = [[[theRoute latitude] objectAtIndex:idx] doubleValue]; CLLocationDegrees longitude = [[[theRoute longitude] objectAtIndex:idx] doubleValue]; // create our coordinate and add it to the correct spot in the array CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(latitude, longitude); MKMapPoint point = MKMapPointForCoordinate(coordinate); // // adjust the bounding box // // 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; } // create the polyline based on the array of points. self.routeLine = [MKPolyline polylineWithPoints:pointArr count:theRoute.latitude.count]; _routeRect = MKMapRectMake(southWestPoint.x, southWestPoint.y, northEastPoint.x - southWestPoint.x, northEastPoint.y - southWestPoint.y); // clear the memory allocated earlier for the points free(pointArr); return self.routeLine; } - (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id )overlay { NSLog(@"DELEGATE CALL"); 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 = 15; } overlayView = self.routeLineView; } return overlayView; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { // Navigation logic may go here. Create and push another view controller. /* <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil]; // ... // Pass the selected object to the new view controller. [self.navigationController pushViewController:detailViewController animated:YES]; */ } @end </code></pre>

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