CountDown Timer

CountDown Timer

ViewController.h :

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

{

    IBOutlet UILabel *myCounterLabel;

    

}

-(void)updateCounter:(NSTimer *)theTimer;

-(void)countdownTimer;

@end

ViewController.m :

#import "ViewController.h"

@interface ViewController ()

@end

NSTimer *timer;

int hours, minutes, seconds;

int secondsLeft;

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    

    secondsLeft = 20;

    

     [self countdownTimer];

    

}

- (void)updateCounter:(NSTimer *)theTimer {

    if(secondsLeft > 0 ){

        secondsLeft -- ;

        hours = secondsLeft / 3600;

        minutes = (secondsLeft % 3600) / 60;

        seconds = (secondsLeft %3600) % 60;

        myCounterLabel.text = [NSString stringWithFormat:@"%02d:%02d:%02d", hours,minutes,seconds];

        if (secondsLeft==0)

        {

            /*screen2 *np=[[screen2 alloc]init];

             [self.navigationController pushViewController:np animated:YES];*/

        }

    }

}

-(void)countdownTimer

{

    

    timer = [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(updateCounter:) userInfo:nil repeats:YES];

    

}

- (void)viewWillDisappear:(BOOL)animated

{

    [timer invalidate];

    timer = nil;

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end