ボタンの配置

gistfile1.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
    
    
    float valueR = 1.;
    float valueG = 1.;
    float valueB = 1.;
    float valueAlpha = 1.;
    int center = self.view.frame.size.width / 2;
    int bottom = self.view.frame.size.height;
    int bottunWIdth = 50;
    int bottunheight = 20;
    int bottomMargin = 50;
    int buttonMargine = 20;
    
#pragma mark - buttonR
    //https://gist.github.com/1f6932ec3b8407c4c409
    UIButton *buttonRPlus =
    [UIButton buttonWithType:100];
    [buttonRPlus setTitle:@"R+" forState:UIControlStateNormal];
    buttonRPlus.frame =
    CGRectMake(center - bottunWIdth / 2 - buttonMargine - bottunWIdth, bottom - bottomMargin - bottunheight - buttonMargine, bottunWIdth, bottunheight);
    buttonRPlus.tintColor = [UIColor colorWithRed:valueR green:1. blue:1. alpha:1.];
    [self.view addSubview:buttonRPlus];
    
    UIButton *buttonRMinus =
    [UIButton buttonWithType:100];
    [buttonRMinus setTitle:@"G-" forState:UIControlStateNormal];
    buttonRMinus.frame = CGRectMake(center - bottunWIdth / 2 - buttonMargine - bottunWIdth, bottom - bottomMargin, bottunWIdth, bottunheight);
    buttonRMinus.tintColor = [UIColor colorWithRed:valueR green:1. blue:1. alpha:1.];
    [self.view addSubview:buttonRMinus];
    
#pragma mark - buttonG
    UIButton *buttonGPlus =
    [UIButton buttonWithType:100];
    [buttonGPlus setTitle:@"G+" forState:UIControlStateNormal];
    buttonGPlus.frame =
    CGRectMake(center - bottunWIdth / 2, bottom - bottomMargin - bottunheight - buttonMargine, bottunWIdth, bottunheight);
    buttonGPlus.tintColor = [UIColor colorWithRed:1. green:valueG blue:1. alpha:1.];
    [self.view addSubview:buttonGPlus];
    
    UIButton *buttonGMinus =
    [UIButton buttonWithType:100];
    [buttonGMinus setTitle:@"G-" forState:UIControlStateNormal];
    buttonGMinus.frame = CGRectMake(center - bottunWIdth / 2, bottom - bottomMargin, bottunWIdth, bottunheight);
    buttonGMinus.tintColor = [UIColor colorWithRed:1. green:valueG blue:1. alpha:1.];
    [self.view addSubview:buttonGMinus];
    
#pragma mark - buttonB
    UIButton *buttonBPlus =
    [UIButton buttonWithType:100];
    [buttonBPlus setTitle:@"B+" forState:UIControlStateNormal];
    buttonBPlus.frame =
    CGRectMake(center - bottunWIdth / 2 + buttonMargine + bottunWIdth, bottom - bottomMargin - bottunheight - buttonMargine, bottunWIdth, bottunheight);
    buttonBPlus.tintColor = [UIColor colorWithRed:1. green:1. blue:valueB alpha:1.];
    [self.view addSubview:buttonBPlus];
    
    UIButton *buttonBMinus =
    [UIButton buttonWithType:100];
    [buttonBMinus setTitle:@"B-" forState:UIControlStateNormal];
    buttonBMinus.frame = CGRectMake(center - bottunWIdth / 2 + buttonMargine + bottunWIdth, bottom - bottomMargin, bottunWIdth, bottunheight);
    buttonBMinus.tintColor = [UIColor colorWithRed:1. green:1. blue:valueB alpha:1.];
    [self.view addSubview:buttonBMinus];
    
}

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

@end