没有在计时器Objective-C上调用委托

Question

I all I wonder if anybody can help me once again? I have moved my location coding from my View controller into an NSObject. I have then called this from the App Delegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
//Updating Location
[Location sharedLocation];

//Timer for reloading the XML
recheckTimer = [NSTimer scheduledTimerWithTimeInterval:30 target:self selector:@selector(recheckLocation) userInfo:nil repeats:YES];
return YES:
}

I have set a timer for when I want this process ran again

-(void)recheckLocation
{
  //Updating Location
  [Location sharedLocation];
  NSLog(@"Timer Triggered");
}

The only thing is when the timer triggers the sharedlocation does not get updated again?? Please can anybody help in advance? Many thanks, Jon.

#import "Location.h"

@implementation Location


@synthesize locationManager;


- (id)init {
  self = [super init];

  if(self) {
    self.locationManager = [CLLocationManager new];
    [self.locationManager setDelegate:self];
    [self.locationManager setDistanceFilter:500];//Metres
    [self.locationManager setHeadingFilter:90];
    [self.locationManager startMonitoringSignificantLocationChanges];
  }
  return self;
}


+ (Location*)sharedLocation {
  static Location* sharedLocation;
  if(!sharedLocation) {
    @synchronized(sharedLocation) {
      sharedLocation = [Location new];
    }
  }

  return sharedLocation;
}


//LOCATION CODING
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(@"didFailWithError' %@", error);
UIAlertView *errorAlert = [[UIAlertView alloc]initWithTitle:@"Error" message:@"Failed to Get Your Current Location" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];

 [errorAlert show];
}


- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
  NSLog(@"didUpdateToLocation: %@", newLocation);
  CLLocation *currentLocation = newLocation;

  if (currentLocation != nil) {

    //Resolve Web Address
    webAddressResolved = [NSString stringWithFormat:@"XZYYFASDFA%f,%f.xml", currentLocation.coordinate.latitude, currentLocation.coordinate.longitude];
    NSLog(@"Address Resolved %@", webAddressResolved);
  }

  //Stop Location Manager
  [locationManager stopMonitoringSignificantLocationChanges];

}

Answer 1

Well what yo defined here is a singleton of Location and the purpose of shared location does not seem to update the location as it says in the code comments

what the sharedInstance does is return a reference that is once initialized and is used the same everywhere in the whole code.It gives you the location instance in return, which you are not retrieving anywhere and using it.You just call it but not use it.

Define a method to update location and call it after getting the memory from the location using

Location *sharedLoc=[Location sharedLocation];

and call the method to update the location as

[sharedLoc updateLocation];

Location.h

-(void)updateLocation;

in Location .m

-(void)updateLocation
{
//Code for updation purpose
}