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iPhoneアプリ開発で、フォントや色をスッキリ管理するやり方

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デザイナーの方とアプリを作っていると、文字などで使う色のパターンがある程度決まってくる。
それを、いちいちxibやstoryboardで指定するのは面倒だし、コードで指定する場合でも毎回[UIColor colorWithRed:green:blue]で指定していると変更があった時に死ぬ。
そこで、ちょっとしたカテゴリを作成しておくとスッキリ管理できて簡単に使えるようになる。

UIColor+MYExtention.h
#import <UIKit/UIKit.h>

@interface UIColor (MYExtention)
+ (UIColor *)myC1;
+ (UIColor *)myC2;
@end
UIColor+MYExtention.m
#import "UIColor+MYExtention.h"

@implementation UIColor (MYExtention)
+ (UIColor *)colorWithDecimalRed:(NSInteger)red green:(NSInteger)green blue:(NSInteger)blue alpha:(CGFloat)alpha
{
    return [UIColor colorWithRed:red/255.0 green:green/255.0 blue:blue/255.0 alpha:alpha];
}

+ (UIColor *)myC1
{
    return [UIColor colorWithDecimalRed:111 green:103 blue:100 alpha:1.0];
}

+ (UIColor *)myC2
{
    return [UIColor colorWithDecimalRed:150 green:144 blue:138 alpha:1.0];
}
@end

#import "UIColor+MYExtention.h"をhoge-Prefix.pchに追記しておけば、プロジェクトのどこからでもimport無しで利用できるようになる。
使うときはこんな感じ。

self.view.backgroundColor = [UIColor myC1];

同様に、フォントもカテゴリを作成しておくと何かと便利。

UIFont+MYExtention.h
@interface UIFont (MYExtention)
+ (UIFont *)myF200;
+ (UIFont *)myF160;
@end
UIFont+MYExtention.m
#import "UIFont+MYExtention.h"

@implementation UIFont (MYExtention)

+ (UIFont *)myF200
{
    return [UIFont fontWithName:@"AvenirNext-UltraLight" size:200];
}

+ (UIFont *)myF160
{
    return [UIFont fontWithName:@"AvenirNext-UltraLight" size:160];
}
@end
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