Timers VS Scheduler

• Try NOT to use Cocoa’s NSTimer. Instead use cocos2d’s own scheduler.
• If you use cocos2d scheduler, you will have:
  • automatic pause/resume.
  • when the CCLayer (CCScene, CCSprite, CCNode) enters the stage the timer will be automatically activated, and when it leaves the stage it will be automatically deactivated.
  • Your target/selector will be called with a delta time

/**********************************************************/
// OK OK OK OK OK
/**********************************************************/
-(id) init
{
    if( (self=[super init] ) ) {
        // schedule a callback
        [self scheduleUpdate];  // available since v0.99.3
        [self schedule: @selector(tick2:) interval:0.5];
    }
 
    return self;
}
 
-(void) update: (ccTime) dt
{
    // bla bla bla
}
 
-(void) tick2: (ccTime) dt
{
    // bla bla bla
}
 
/**********************************************************/
// BAD BAD BAD BAD
/**********************************************************/
// Why BAD ?
// You can't pause the game automatically.
-(void) onEnter
{
    [super onEnter];
    timer1 = [NSTimer scheduledTimerWithTimeInterval:1/FPS target:self selector:@selector(tick1) userInfo:nil repeats:YES];
    timer2 = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(tick2) userInfo:nil repeats:YES];
}
-(void) onExit
{
    [timer1 invalidate];
    [timer2 invalidate];
    [super onExit];
}
-(void) tick
{
    // bla bla bla
}
 
-(void) tick2
{
    // bla bla bla
}