Simplify work with timer.

Features

• block based
• no retain cycle on self in block
• no need invalidate, timer will be released with self

Usage

Start

      WEAK_TIMER_ONCE(seconds, block_body);   // no repeat timer
      WEAK_TIMER_REPEAT(seconds, block_body); // repeat timer

Stop

      WEAK_TIMER_STOP(timerToken);        // stop timer with token
      WEAK_TIMER_STOP_ALL();              // stop all timers

Examples

1. Start repeat timer, it will be released with self

   - (void)viewDidLoad {
       [super viewDidLoad];
   
       WEAK_TIMER_REPEAT(1, {
           self.value++;
       });
   }
   

2. Save timer token to stop timer later manually

   // @property (nonatomic) id timerToken;
   -(void)viewDidAppear:(BOOL)animated {
       [super viewDidAppear:animated];
       self.timerToken = WEAK_TIMER_ONCE(5, {
           NSLog(@"5 sec elapsed");
       });
   }
   -(void)viewWillDisappear:(BOOL)animated {
       [super viewWillDisappear:animated];
       WEAK_TIMER_STOP(self.timerToken);
   }
   

   The token is not necessary if only one timer is used or you need stop all timers

   -(void)viewDidAppear:(BOOL)animated {
       [super viewDidAppear:animated];
       WEAK_TIMER_ONCE(5, {
           NSLog(@"5 sec elapsed");
       });
   }
   -(void)viewWillDisappear:(BOOL)animated {
       [super viewWillDisappear:animated];
       WEAK_TIMER_STOP_ALL();
   }