沒有在計時器Objective-C上調用委托

Question

我很想知道是否有人可以再次幫助我？ 我已經將位置編碼從View控制器移到了NSObject中。 然后我從App Delegate調用了這個

- (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:
}

我已經設置了一個計時器，該計時器何時可以再次運行

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

唯一的事情是當計時器觸發共享位置時不會再次更新？ 請有人可以提前幫助嗎？ 非常感謝，喬恩。

#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

好吧，這里定義的是位置的單例，共享位置的目的似乎沒有更新代碼注釋中所指出的位置

sharedInstance所做的是返回一個引用，該引用一旦被初始化並在整個代碼中的各處使用相同，它將為您提供位置實例作為回報，您無需在任何地方檢索並使用它，您只需調用它就可以使用它。

定義一種更新位置的方法，並在使用以下方法從位置獲取內存后調用該方法

Location *sharedLoc=[Location sharedLocation];

並調用方法將位置更新為

[sharedLoc updateLocation];

位置.h

-(void)updateLocation;

在位置.m

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