Crash in MapVIew - iphone

Question

I am loading a MKMapView with some pins, which drops based on address co-ordinates. Everything is working fine until, I keep the mapview open for sometime(2 minutes). And then it crashes, without an event actually taking place. What could be the reason for this.
In my viewDidLoad I write the following code
mapView = [[MKMapView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
mapView.delegate=self;
[self.view addSubview:mapView];
addressbook = ABAddressBookCreate();
for (i = 0; i<[groupContentArray count]; i++) {
NSLog(#"group content array %#", groupContentArray);
person = ABAddressBookGetPersonWithRecordID(addressbook,[[groupContentArray objectAtIndex:i] intValue]);
NSLog(#"Person %#", person);
ABMultiValueRef addressProperty = ABRecordCopyValue(person, kABPersonAddressProperty);
NSArray *address = (NSArray *)ABMultiValueCopyArrayOfAllValues(addressProperty);
NSLog(#"Address %#", address);
for (NSDictionary *addressDict in address)
{
addAnnotation = nil;
firstName = (NSString *)ABRecordCopyValue(person, kABPersonFirstNameProperty);
lastName = (NSString *)ABRecordCopyValue(person, kABPersonLastNameProperty);
NSString *country = [addressDict objectForKey:#"Country"];
NSString *streetName = [addressDict objectForKey:#"Street"];
NSString *cityName = [addressDict objectForKey:#"City"];
NSString *stateName = [addressDict objectForKey:#"State"];
if (streetName == (id)[NSNull null] || streetName.length == 0 ) streetName = #"";
if (stateName == (id)[NSNull null] || stateName.length == 0 ) stateName = #"";
if (cityName == (id)[NSNull null] || cityName.length == 0 ) cityName = #"";
if (country == (id)[NSNull null] || country.length == 0 ) country = #"";
NSString *fullAddress = [streetName stringByAppendingFormat:#"/%#/%#/%#", cityName, stateName, country];
mapCenter = [self getLocationFromAddressString:fullAddress];
if(stateName != NULL || country != NULL || streetName != NULL || cityName != NULL){
if ((mapCenter.latitude == 0) && (mapCenter.longitude == 0))
{
//Alert View
}
else{
if(addAnnotation == nil){
addAnnotation = [[[MyAddressAnnotation alloc] initWithCoordinate:mapCenter title:firstName SubTitle:lastName Recordid:[groupContentArray objectAtIndex:i] ]autorelease];
[mapView addAnnotation:addAnnotation];}
else{
// ALert View
}
}
}
}
CFRelease(addressProperty);
}
[self zoomToFitMapAnnotations:mapView];
[self.navigationItem setHidesBackButton:YES animated:YES];
NSString *mapTitle = localizedString(#"MAP_TITLE");
[self setTitle:mapTitle];
[segmentedControl addTarget:self action:#selector(segmentAction:) forControlEvents:UIControlEventValueChanged];

Answer 1

Try this:
- (void)viewDidLoad {
[super viewDidLoad];
UIImageView *topBar = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"header1.png"]];
topBar.frame = CGRectMake(0, 0, 320, 44);
[self.navigationController.navigationBar insertSubview:topBar atIndex:0];
[topBar release];
self.navigationController.navigationBarHidden=YES;
[mapView setMapType:MKMapTypeStandard];
[mapView setZoomEnabled:YES];
[mapView setScrollEnabled:YES];
[mapView setShowsUserLocation:YES];
MKCoordinateRegion region = { {0.0, 0.0 }, { 0.0, 0.0 } };
region.center.latitude = [strLat doubleValue];
region.center.longitude = [strLong doubleValue];
region.span.longitudeDelta = 0.01f;
region.span.latitudeDelta = 0.01f;
[mapView setRegion:region animated:YES];
[mapView setDelegate:self];
mapAnonotationView *ann = [[mapAnonotationView alloc] init];
ann.title = name;
ann.subtitle = Address;
ann.coordinate = region.center;
[mapView addAnnotation:ann];
[ann release];
ann = nil;
}

Answer 2

Setting the mapview delegate to nil in the dealloc method solved my problem.

Answer 3

I was having crashes with my iPhone4S and console revealed nan values for region. After trying about 7 different solutions from SO and various suggestions from Apple DTS, I solved it by eliminating the regionThatFits call. I simply used:
CLLocationDistance visibleDistance = 100000; // 100 kilometers
MKCoordinateRegion adjustedRegion = MKCoordinateRegionMakeWithDistance(zoomLocation, visibleDistance, visibleDistance);
[_mapView setRegion:adjustedRegion animated:YES];
Apparently there is a problem with that regionThatFits method.