Counting Timer

ViewController.h

@interface ViewController : UIViewController{

    NSTimer *timer;

    int MainInt;

     IBOutlet UIButton *drag;

}

@property (weak, nonatomic) IBOutlet UILabel *l1;

- (IBAction)click:(id)sender;

-(void)countup;

- (IBAction)stopTimer:(id)sender;

- (IBAction)reset:(id)sender;

viewcontroller.M

-(void)countup {

    MainInt += 1;

    l1.text = [NSString stringWithFormat:@"%i", MainInt];

    

    

}

- (IBAction)click:(id)sender {

    //MainInt = 0;

    if (timer==nil)

    {

    

    timer = [NSTimer scheduledTimerWithTimeInterval:1.0

                                             target:self selector:@selector(countup)userInfo:nil repeats:YES];

        

    }

}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{

    UITouch *touch=[[event allTouches]anyObject];

    drag.center=[touch locationInView:self.view];

    

}

- (IBAction)stopTimer:(id)sender

{

    if (timer != nil)

    {

        [timer invalidate];

        timer = nil;

    }

}

- (IBAction)reset:(id)sender {

    MainInt=0;

    

    

}