I have been researching for days on how to do this and nobody has an answer.

I am creating an app with 5 timers on the same view. I need to create a timer that counts down from "15:00" (minutes and seconds), and, another that counts down from "2:58" (minutes and seconds). The 15 minute timer should not repeat, but it should stop all other timers when it reaches "00:00." The "2:58" timer should repeat until the "15:00" or "Game Clock" reaches 0. Right now, I have scrapped almost all of my code and I'm working on the "2:58" repeating timer, or "rocketTimer."

Does anyone know how to do this?

Here is my code:

    #import <UIKit/UIKit.h>


@interface FirstViewController : UIViewController {



    //Rocket Timer
    int totalSeconds;
    bool timerActive;
    NSTimer *rocketTimer;
    IBOutlet UILabel *rocketCount;

    int newTotalSeconds;
    int totalRocketSeconds;
    int minutes;
    int seconds;

}

- (IBAction)Start;



@end

and my .m

    #import "FirstViewController.h"

@implementation FirstViewController

- (NSString *)timeFormatted:(int)newTotalSeconds
{

    int seconds = totalSeconds % 60; 
    int minutes = (totalSeconds / 60) % 60; 


    return [NSString stringWithFormat:@"%i:%02d"], minutes, seconds; 
}


-(IBAction)Start {

    newTotalSeconds = 178; //for 2:58

    newTotalSeconds = newTotalSeconds-1;

    rocketCount.text = [self timeFormatted:newTotalSeconds];


    if(timerActive == NO){

        timerActive = YES;
        newTotalSeconds = 178;

      [rocketTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerLoop) userInfo:nil repeats:YES];
    }

    else{

        timerActive = NO;
        [rocketTimer invalidate];
        rocketTimer = nil;

    }

}



-(void)timerLoop:(id)sender {

    totalSeconds = totalSeconds-1;

    rocketCount.text = [self timeFormatted:totalSeconds];


}

- (void)dealloc
{
    [super dealloc];

    [rocketTimer release];


}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}


- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.

    timerActive = NO;
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end