stackoverflow when try to pass variable to bool function
-(IBAction)start:(id)sender
{
    timer = [NSTimer scheduledTimerWithTimeInterval:.01 target:self selector:@selector(updateTimer:) userInfo:nil repeats:YES];

    MainInt = 0;
    numbersTimer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(countup) userInfo:nil repeats:YES];
}
-(void)countup
{
    MainInt += 1;
    numbersLabel.text = [NSString stringWithFormat:@"%i", MainInt];
    count = numbersLabel.text.intValue;
    NSLog(@"num: %d", count);

   if ([self checknum:(count) == false]) {
   NSLog(@"BOOM");
   }

}
-(BOOL)checknum:(int)number
{
    while (number<10)
    {
        if(number ==7)
        {
            NSLog(@"boom, i=%d", number);
            return true;
        }


    }

    while (number>=10 && number<1000)
    {
        if(number % 7 == 0)
        {
            NSLog(@"boom i=%d", number);
            return true;

        }

        if([self revese:(number)])
        {
            NSLog(@"boom reverse num = %d", number);
            return true;

        }

    }

    return false;
}


-(BOOL) revese:(int)number
{
    if(number < 10 && number != 7)
        return false;
    if(((number % 10) == 7) || ((number / 10) == 7))
        return true;
    else {
        [self revese:(number / 10)];
    }
    return false;

}

if ([self checknum:(count) == false]) {
   NSLog(@"BOOM");
}

BOOL isLessThanOne = (count < 1);
if ([self checksum:isLessThanOne]) {
           NSLog(@"BOOM");
}

if ([self checksum:count] == NO) {
       NSLog(@"BOOM");
    }

while (number<10)

while (number>=10 && number<1000)

if(number<10){
// do some tests

} else if (number<1000){
// do some other tests


}