iOS Timer in the background

Question

I want in my iOS application to start a timer when the app is running in the background and when the app is closed. The timer must check every 30 minutes of there a new noti

Answer 1

Write this both methos in your Appdelegate.m file

//For Objective c
    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    {
          [self TimerMethod];
    }
    -(void)TimerMethod
    {
        //Every 30 minute call the functions
        _timer=[NSTimer scheduledTimerWithTimeInterval:1800.0f target:self selector:@selector(updateMethod:) userInfo:nil repeats:YES];
    }

    - (void)updateMethod:(NSTimer *)theTimer
    {
        NSLog(@"Timer set now");
    }

//For Swift

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool 
{
     self.TimerMethod()
}

func TimerMethod()
{
      var timer = NSTimer.scheduledTimerWithTimeInterval(1800, target: self, selector: "updateMethod", userInfo: nil, repeats: true)
}

func updateMethod()
{
    print("set timer now")
}