How to trigger a video when a user reaches a certain location? - iphone

Question

This is my CoreLocationController.h objective c class
#import <Foundation/Foundation.h>
#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>
extern const CLLocationAccuracy kCLLocationAccuracyBest;
#protocol CoreLocationControllerDelegate
#required
- (BOOL)startRegionMonitoring;
- (void)locationUpdate:(CLLocation *)location; // Our location updates are sent here
- (void)locationError:(NSError *)error; // Any errors are sent here
#end
#interface CoreLocationController : NSObject <CLLocationManagerDelegate, MKMapViewDelegate> {
CLLocationManager *locMgr;
CLLocationCoordinate2D coordinate;
IBOutlet MKMapView *worldView;
IBOutlet UIActivityIndicatorView *activityIndicator;
id delegate;
}
#property (nonatomic, retain) CLLocationManager *locMgr;
#property (nonatomic, assign) id delegate;
#property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
#end
and this is the CorelocationController.m
#import "CoreLocationController.h"
#implementation CoreLocationController
#synthesize locMgr, delegate, coordinate;
- (id)init {
self = [super init];
if(self != nil) {
self.locMgr = [[[CLLocationManager alloc] init] autorelease]; // Create new instance of locMgr
self.locMgr.delegate = self; // Set the delegate as self.
[locMgr setDistanceFilter:kCLDistanceFilterNone];
[locMgr setDesiredAccuracy:kCLLocationAccuracyBest];
[worldView setShowsUserLocation:YES];
}
return self;
}
- (BOOL)startRegionMonitoring {
if (![CLLocationManager regionMonitoringAvailable] || ![CLLocationManager regionMonitoringEnabled] )
return NO;
CLLocationCoordinate2D home;
home.latitude = +51.49410630;
home.longitude = -0.10251360;
CLRegion * region = [[CLRegion alloc] initCircularRegionWithCenter:home radius:10.0 identifier:#"home"];
if (locMgr == nil)
locMgr = ([[CLLocationManager alloc] init]);
[locMgr startMonitoringForRegion:region desiredAccuracy:kCLLocationAccuracyBest];
[region release];
return YES;
}
- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region{
NSLog(#"Enteed location");
// [self leavingHomeNotify];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Location entered" message:#"Region entered" delegate:NULL cancelButtonTitle:#"OK" otherButtonTitles:NULL];
[alert show];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
if([self.delegate conformsToProtocol:#protocol(CoreLocationControllerDelegate)]) { // Check if the class assigning itself as the delegate conforms to our protocol. If not, the message will go nowhere. Not good.
[self.delegate locationUpdate:newLocation];
}
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
if([self.delegate conformsToProtocol:#protocol(CoreLocationControllerDelegate)]) { // Check if the class assigning itself as the delegate conforms to our protocol. If not, the message will go nowhere. Not good.
[self.delegate locationError:error];
}
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Location failed" message:#"Location failed" delegate:NULL cancelButtonTitle:#"OK" otherButtonTitles:NULL];
[alert show];
}
- (void)dealloc {
[self.locMgr release];
[super dealloc];
}
#end
This is the CoreLocationDemoViewer.h
#import <UIKit/UIKit.h>
#import "CoreLocationController.h"
#import <MapKit/MapKit.h>
#interface CoreLocationDemoViewController : UIViewController <CoreLocationControllerDelegate, MKMapViewDelegate> {
CoreLocationController *CLController;
IBOutlet UILabel *locLabel;
MKMapView *worldView;
}
#property (nonatomic, retain) CoreLocationController *CLController;
#property (nonatomic, retain) IBOutlet UILabel *locLabel;
#property (nonatomic, retain) MKMapView *worldView;
#end
This is the CoreLocationDemoViewer.m
#import "CoreLocationDemoViewController.h"
#implementation CoreLocationDemoViewController
#synthesize CLController;
#synthesize locLabel;
#synthesize worldView;
- (void)viewDidLoad {
[super viewDidLoad];
self.worldView.mapType = MKMapTypeStandard; // also MKMapTypeSatellite or MKMapTypeHybrid
CLController = [[CoreLocationController alloc] init];
CLController.delegate = self;
[CLController.locMgr startUpdatingLocation];
worldView.zoomEnabled = YES;
worldView.scrollEnabled = YES;
}
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)u
{
CLLocationCoordinate2D loc = [u coordinate];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(loc, 250, 250);
[worldView setRegion:region animated:YES];
}
- (void)locationUpdate:(CLLocation *)location {
locLabel.text = [location description];
// [mapView setCenterCoordinate:location.coordinate];
// [mapView setShowsUserLocation:YES];
CLLocationCoordinate2D coord = [location coordinate];
// Add it to the map view
// [worldView addAnnotation:mp];
// MKMapView retains its annotations, we can release
// [mp release];
// Zoom the region to this location
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(coord, 50, 50);
[worldView setRegion:region animated:YES];
// [locationManager stopUpdatingLocation];
}
- (void)locationError:(NSError *)error {
locLabel.text = [error description];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
// The designated initializer. Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
/*
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization.
}
return self;
}
*/
/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
}
*/
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations.
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (void)viewDidUnload {
[super viewDidUnload];
self.worldView = nil;
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[CLController release];
[worldView release];
[super dealloc];
}
#end
Ok so this is what i want. Until now it shows a map with the user location
and it finds the exact location which is shown on a label.. correct if i am doing anything wrong..
What i want to do is trigger a video when a user reaches a certain location...
IAm approaching right?

Answer 1

I think if you are just having trouble getting the mapView to zoom correctly, use the MKCoordinate stuff from this post, How do I zoom an MKMapView.
I am working on a mapview as well that zooms to a decent level for viewing, and I am setting the lattitudeDelta and longitudeDelta for the map. Works good for me.

Answer 2

Perhaps something is wrong with setting the delegate? I usually specify the delegate in the .h file like this:
id <CoreLocationControllerDelegate> delegate;
and
#property (nonatomic, assign) id <CoreLocationControllerDelegate> delegate;
EDIT
Also, did you check that -mapView:didUpdateUserLocation: is being called?

Answer 3

I don't see you assigning the delegate for worldView (but you do for your other stuff). Try adding worldView.delegate = self; in your viewDidLoad.