Reload the Map when we navigate to MapTabBar - iphone

Question

I have a tabBarView controller and a TableViewController. When I click on a row I wan to go to another Tab which is UIViewController with Map:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
if(storeName)
[self setMap];
}
- (void) setMap {
NSLog(#"Name:%#\n", storeName);
NSLog(#"Adress:%#\n", storeAddress);
self.indexMapView.delegate = self;
self.indexMapView.showsUserLocation = NO;
self.locationManager = [[CLLocationManager alloc] init];
[locationManager setDelegate:self];
[locationManager setDistanceFilter:kCLDistanceFilterNone];
[locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
[self.indexMapView setShowsUserLocation:YES];
CLLocationCoordinate2D location = [self getLocationFromAddressString:self.storeAddress];
NSLog(#"%g", location.latitude);
MapViewAnnotation *mapAnnotation = [[MapViewAnnotation alloc] initWithTitle:#"Store location" coordinate:location];
[self.indexMapView addAnnotation:mapAnnotation];
}
-(CLLocationCoordinate2D) getLocationFromAddressString:(NSString*) addressStr {
NSLog(#"FFF");
NSString *urlStr = [NSString stringWithFormat:#"http://maps.google.com/maps/geo?q=%#&output=csv",
[addressStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSError *error = nil;
NSString *locationStr = [NSString stringWithContentsOfURL:[NSURL URLWithString:urlStr] encoding:NSUTF8StringEncoding error:&error];
NSArray *items = [locationStr componentsSeparatedByString:#","];
double lat = 0.0;
double lon = 0.0;
if([items count] >= 4 && [[items objectAtIndex:0] isEqualToString:#"200"]) {
lat = [[items objectAtIndex:2] doubleValue];
lon = [[items objectAtIndex:3] doubleValue];
}
else {
NSLog(#"Address, %# not found: Error %#",addressStr, [items objectAtIndex:0]);
}
CLLocationCoordinate2D location;
location.latitude = lat;
location.longitude = lon;
return location;
}
This is how I go to the MapViewController:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
MapViewController *mapViewController = [[MapViewController alloc]init];
[mapViewController setStoreAddress:store.address];
[mapViewController setStoreName:store.name];
[mapViewController viewDidLoad];
[self.tabBarController setSelectedIndex:4];
}
The problem is Map does not get update when I go to the page again. When I tried it with PushSegue, it works. but how can I make it work with TabBar?

Answer 1

Well, it looks like you commented out your call to -setMap, which means that when the view loads, nothing of interest is going to happen. Was that intentional?

Answer 2

I figured out how can I pass the data over tab bars. You can find more descriptions in these links:
iPhone: How to Pass Data Between Several Viewcontrollers in a Tabbar App
Passing a managedObjectContext through to a UITabBarController's views
Also this tutorial is useful.