ans.m

//
//  ViewController.m
//  CountSample
//
//  Created by Shoya Ishimaru on 13/03/30.
//  Copyright (c) 2013年 Shoya Ishimaru. All rights reserved.
//

#import "ViewController.h"

@interface ViewController (){
    int counterNumber;
}

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    counterNumber = 0;
    [self setNumberColor:counterNumber];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)buttonWasPushed:(id)sender {

    counterNumber ++;
    [self setNumberColor:counterNumber];

}

- (IBAction)clearWasPushed:(id)sender {
    counterNumber = 0;
    [self setNumberColor:counterNumber];
}

- (void)setNumberColor:(int)number{

    self.numberLabel.textColor = [UIColor blackColor];
    self.numberLabel.text = [NSString stringWithFormat:@"%d",counterNumber];

    int tmp = counterNumber;
    while (tmp != 0) {
        if (tmp%10 == 3) {
            self.numberLabel.textColor = [UIColor redColor];
            return;
        }
        tmp = tmp/10;
    }

    if (number%3 == 0) {
        self.numberLabel.textColor = [UIColor redColor];
    }
}

@end