CLLocation doesn't work - unrecognized selector sent to instance - objective-c

Question

I have a tabbar project in xcode and on the first view i need to find my GPS location and I need to save longitude and latitude on two variables on the appdelegate. Here some code:
FirstViewController.h
#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
#interface FirstViewController : UIViewController <CLLocationManagerDelegate>{
CLLocationManager *locationManager;
}
#property (nonatomic, retain) CLLocationManager *locationManager;
#end
FirstViewController.m
#import "FirstViewController.h"
#import "CampeggiandoAppDelegate.h"
#import <CoreLocation/CoreLocation.h>
#interface FirstViewController ()
#end
#implementation FirstViewController
#synthesize locationManager;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
self.tabBarItem.image = [UIImage imageNamed:#"ic_home2"];
self.tabBarItem.title=#"Home";
}
return self;
}
- (void)viewDidLoad {
[super viewDidLoad];
self.locationManager = [[[CLLocationManager alloc] init] autorelease];
self.locationManager.delegate = self;
self.locationManager.distanceFilter=500.0f;
self.locationManager.desiredAccuracy=kCLLocationAccuracyHundredMeters;
[self.locationManager startUpdatingLocation];
}
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation {
CampeggiandoAppDelegate *appDelegate=(CampeggiandoAppDelegate*)[[UIApplication sharedApplication]delegate];
appDelegate.latitudineDel=[NSString stringWithFormat:#"%3.5f", newLocation.coordinate.latitude];
appDelegate.longitudineDel=[NSString stringWithFormat:#"%3.5f", newLocation.coordinate.longitude];
}
When I run the compiler and the fitst view comes up the application broke and appears this exception:
Terminating app due to uncaught exception
'NSInvalidArgumentException', reason: '-[AppDelegate
setLatitudineDel:]: unrecognized selector sent to instance 0x84210b0'
Any help? Thanks.

Answer 1

Your class interface should look like this before setting variables the way you do:
#interface CampeggiandoAppDelegate : UIResponder <UIApplicationDelegate> {
// ...
// some ivars
// ...
}
#property (nonatomic, strong) NSString *latitudineDel;
#property (nonatomic, strong) NSString *longitudineDel;
#end
What you have for this moment is this:
#interface CampeggiandoAppDelegate : UIResponder <UIApplicationDelegate> {
// ...
NSString *latitudineDel;
NSString *longitudineDel
// ...
}
#end
So there are no setters for those instance variables, that's why the exception is thrown.
For more information about properties read this.