背景色を変えるのにスライダーを使った

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 = 0.5;
float valueG = 0.5;
float valueB = 0.5;
float valueAlpha = 1.;
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 viewUpdate];
    
    int center = self.view.frame.size.width / 2;
    int bottom = self.view.frame.size.height;
    int bottomMargin = 0;
    int buttonWidth = self.view.frame.size.height / 5 * 4;
    int buttonHeight = 0;
    int buttonMargin = 0;
    
    //270度回転
    CGAffineTransform trans = CGAffineTransformMakeRotation(M_PI * 270 / 180.0f);
    
#pragma mark - sliderR
    UISlider *sliderR = [[UISlider alloc]
                         initWithFrame:CGRectMake(center - buttonWidth / 2 - center / 2, bottom / 2, buttonWidth, buttonHeight)];
    sliderR.value = 0.5;
    sliderR.minimumValue = 0.0;
    sliderR.maximumValue = 1.0;
    
    sliderR.continuous = YES;
    
    sliderR.transform = trans;
    
    [sliderR addTarget:self
               action:@selector(sliderRValueChanged:)
     forControlEvents:UIControlEventValueChanged];
    
    [self.view addSubview:sliderR];
    
#pragma mark - sliderG
    UISlider *sliderG = [[UISlider alloc]
                         initWithFrame:CGRectMake(center - buttonWidth / 2, bottom / 2, buttonWidth, buttonHeight)];
    sliderG.value = 0.5;
    sliderG.minimumValue = 0.0;
    sliderG.maximumValue = 1.0;
    
    sliderG.continuous = YES;
    
    sliderG.transform = trans;
    
    [sliderG addTarget:self
                action:@selector(sliderGValueChanged:)
      forControlEvents:UIControlEventValueChanged];
    
    [self.view addSubview:sliderG];
    
#pragma mark - sliderB
    UISlider *sliderB = [[UISlider alloc]
                         initWithFrame:CGRectMake(center - buttonWidth / 2 + center / 2,  bottom / 2,  buttonWidth, buttonHeight)];
    sliderB.value = 0.5;
    sliderB.minimumValue = 0.0;
    sliderB.maximumValue = 1.0;
    
    sliderB.continuous = YES;
    
    sliderB.transform = trans;
    
    [sliderB addTarget:self
                action:@selector(sliderBValueChanged:)
      forControlEvents:UIControlEventValueChanged];
    
    [self.view addSubview:sliderB];
}

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

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

}

#pragma mark - buttonRUpdateMethod
- (void)sliderRValueChanged:(id)sender
{
    UISlider *slValueR = sender;
    
    valueR = slValueR.value;
    
    // スライダーの値をログに記述
    NSLog(@"スライダーの値：%f", slValueR.value);
    [self viewUpdate];
}

#pragma mark - buttonGUpdateMethod
- (void)sliderGValueChanged:(id)sender
{
    UISlider *slValueG = sender;
    
    valueG = slValueG.value;
    
    // スライダーの値をログに記述
    NSLog(@"スライダーの値：%f", slValueG.value);
    [self viewUpdate];
}

#pragma mark - buttonBUpdateMethod
- (void)sliderBValueChanged:(id)sender
{
    UISlider *slValueB = sender;
    
    valueB = slValueB.value;
    
    // スライダーの値をログに記述
    NSLog(@"スライダーの値：%f", slValueB.value);
    [self viewUpdate];
}

@end