Timer Object C

***Timer Delay:

double delayInSeconds = 1.2;

dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));

dispatch_after(popTime, dispatch_get_main_queue(), ^(void){

    NSLog(@"Do some work");

});

***Timer Repeat:

- (void)viewDidAppear:(BOOL)animated {

    float delayTime = 1.0f;

    if (_timerUpdate == nil) {

        _timerUpdate = [NSTimer scheduledTimerWithTimeInterval:delayTime target:self selector:@selector(onTickUpdateIcon:) userInfo:nil repeats:YES];

    }

    [_timerUpdate fire];

}

- (void)onTickUpdateIcon:(NSTimer *)timer {

    // do something...

}

- (void)viewDidDisappear:(BOOL)animated {

    [_timerUpdate invalidate];

    _timerUpdate = nil;

}