ボタンの配置＋ボタン・背景の色の変化（ボタンの色変化は暫定）

viewController.h

//
//  ViewController.h
//  121203
//
//  Created by changhwi on 12/12/03.
//  Copyright (c) 2012年 changhwi. All rights reserved.
//

#import <UIKit/UIKit.h>

//RGB,Alpha値
float valueR = 1.;
float valueG = 1.;
float valueB = 1.;
float valueAlpha = 0.3;
float chengeColor = 0.2;

@interface ViewController : UIViewController
@property (strong, nonatomic) IBOutlet UIView *viewFirst;

@end

viewController.m

//
//  ViewController.m
//  121203
//
//  Created by changhwi on 12/12/03.
//  Copyright (c) 2012年 changhwi. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

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

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

- (void)buttonCreat{
    
    int center = self.view.frame.size.width / 2;
    int bottom = self.view.frame.size.height;
    int bottunWIdth = 60;
    int bottunheight = 40;
    int bottomMargin = 80;
    int buttonMargine = 20;
    int buttonTypeChenge = nil;
    
#pragma mark - buttonR
    //https://gist.github.com/1f6932ec3b8407c4c409
    UIButton *buttonRPlus =
    [UIButton buttonWithType:buttonTypeChenge];
    [buttonRPlus setTitle:@"R+" forState:UIControlStateNormal];
    buttonRPlus.frame =
    CGRectMake(center - bottunWIdth / 2 - buttonMargine - bottunWIdth, bottom - bottomMargin - bottunheight - buttonMargine, bottunWIdth, bottunheight);
    buttonRPlus.backgroundColor = [UIColor colorWithRed:1 - valueR green:0. blue:0. alpha:valueAlpha];
    [self.view addSubview:buttonRPlus];
    //ボタンアクションの設定
    [buttonRPlus addTarget:self
                    action:@selector(buttonRPlusMethod:)
          forControlEvents:UIControlEventTouchUpInside];
    
    UIButton *buttonRMinus =
    [UIButton buttonWithType:buttonTypeChenge];
    [buttonRMinus setTitle:@"G-" forState:UIControlStateNormal];
    buttonRMinus.frame = CGRectMake(center - bottunWIdth / 2 - buttonMargine - bottunWIdth, bottom - bottomMargin, bottunWIdth, bottunheight);
    buttonRMinus.backgroundColor = [UIColor colorWithRed:valueR green:0. blue:0. alpha:valueAlpha];
    [self.view addSubview:buttonRMinus];
    //ボタンアクションの設定
    [buttonRMinus addTarget:self
                     action:@selector(buttonRMinusMethod:)
           forControlEvents:UIControlEventTouchUpInside];
    
#pragma mark - buttonG
    UIButton *buttonGPlus =
    [UIButton buttonWithType:buttonTypeChenge];
    [buttonGPlus setTitle:@"G+" forState:UIControlStateNormal];
    buttonGPlus.frame =
    CGRectMake(center - bottunWIdth / 2, bottom - bottomMargin - bottunheight - buttonMargine, bottunWIdth, bottunheight);
    buttonGPlus.backgroundColor = [UIColor colorWithRed:0. green:1 - valueG blue:0. alpha:valueAlpha];
    [self.view addSubview:buttonGPlus];
    //ボタンアクションの設定
    [buttonGPlus addTarget:self
                    action:@selector(buttonGPlusMethod:)
          forControlEvents:UIControlEventTouchUpInside];
    
    UIButton *buttonGMinus =
    [UIButton buttonWithType:buttonTypeChenge];
    [buttonGMinus setTitle:@"G-" forState:UIControlStateNormal];
    buttonGMinus.frame = CGRectMake(center - bottunWIdth / 2, bottom - bottomMargin, bottunWIdth, bottunheight);
    buttonGMinus.backgroundColor = [UIColor colorWithRed:0. green:valueG blue:0. alpha:valueAlpha];
    [self.view addSubview:buttonGMinus];
    //ボタンアクションの設定
    [buttonGMinus addTarget:self
                     action:@selector(buttonGMinusMethod:)
           forControlEvents:UIControlEventTouchUpInside];
    
#pragma mark - buttonB
    UIButton *buttonBPlus =
    [UIButton buttonWithType:buttonTypeChenge];
    [buttonBPlus setTitle:@"B+" forState:UIControlStateNormal];
    buttonBPlus.frame =
    CGRectMake(center - bottunWIdth / 2 + buttonMargine + bottunWIdth, bottom - bottomMargin - bottunheight - buttonMargine, bottunWIdth, bottunheight);
    buttonBPlus.backgroundColor = [UIColor colorWithRed:0. green:0. blue:1 - valueB alpha:valueAlpha];
    [self.view addSubview:buttonBPlus];
    //ボタンアクションの設定
    [buttonBPlus addTarget:self
                    action:@selector(buttonBPlusMethod:)
          forControlEvents:UIControlEventTouchUpInside];
    
    UIButton *buttonBMinus =
    [UIButton buttonWithType:buttonTypeChenge];
    [buttonBMinus setTitle:@"B-" forState:UIControlStateNormal];
    buttonBMinus.frame = CGRectMake(center - bottunWIdth / 2 + buttonMargine + bottunWIdth, bottom - bottomMargin, bottunWIdth, bottunheight);
    buttonBMinus.backgroundColor = [UIColor colorWithRed:0. green:0. blue:valueB alpha:valueAlpha];
    [self.view addSubview:buttonBMinus];
    //ボタンアクションの設定
    [buttonBMinus addTarget:self
                     action:@selector(buttonBMinusMethod:)
           forControlEvents:UIControlEventTouchUpInside];
}

#pragma mark - viewUpdate
- (void)viewUpdate{
    [UIView animateWithDuration:0.1
                     animations:^{self.view.backgroundColor = [UIColor colorWithRed:valueR green:valueG blue:valueB alpha:valueAlpha ];}
     ];
}

#pragma mark - buttonRUpdateMethod
- (void)buttonRPlusMethod:(UIButton *)buttonRPlus{
    if (valueR <= 1) {
        valueR = valueR + chengeColor;
    }
    [self viewUpdate];
    [self buttonCreat];
    [self.view addSubview:buttonRPlus];
    NSLog(@"%f", valueR);
}

- (void)buttonRMinusMethod:(UIButton *)buttonRMinus{
    if (valueR >= 0) {
        valueR = valueR - chengeColor;
    }
    [self viewUpdate];
    [self buttonCreat];
    [self.view addSubview:buttonRMinus];
    NSLog(@"%f", valueR);
}

#pragma mark - buttonGUpdateMethod
- (void)buttonGPlusMethod:(UIButton *)buttonGPlus{
    if (valueG <= 1) {
        valueG = valueG + chengeColor;
    }
    [self viewUpdate];
    [self buttonCreat];
    [self.view addSubview:buttonGPlus];
    NSLog(@"%f", valueG);
}

- (void)buttonGMinusMethod:(UIButton *)buttonGMinus{
    if (valueG >= 0) {
        valueG = valueG - chengeColor;
    }
    [self viewUpdate];
    [self buttonCreat];
    [self.view addSubview:buttonGMinus];
    NSLog(@"%f", valueG);
}

#pragma mark - buttonBUpdateMethod
- (void)buttonBPlusMethod:(UIButton *)buttonBPlus{
    if (valueB <= 1) {
        valueB = valueB + chengeColor;
    }
    [self viewUpdate];
    [self buttonCreat];
    [self.view addSubview:buttonBPlus];
    NSLog(@"%f", valueB);
}

- (void)buttonBMinusMethod:(UIButton *)buttonBMinus{
    if (valueB >= 0) {
        valueB = valueB - chengeColor;
    }
    [self viewUpdate];
    [self buttonCreat];
    [self.view addSubview:buttonBMinus];
    NSLog(@"%f", valueB);
}

@end