一、宏定义（10进制表示RGB）

定义

#define COLOR(Red, Green, Blue, Alpha) [UIColor colorWithRed:Red/255.0 green:Green/255.0 blue:Blue/255.0 alpha:Alpha]

使用

COLOR(52, 171, 239, 1.0)

二、UIColor+Extensions（16进制表示RGB）

1、UIColor+Extensions.h

#import <UIKit/UIKit.h>

@interface UIColor (Extensions)

+ (UIColor *)colorWithHex:(long)hexColor;

+ (UIColor *)colorWithHex:(long)hexColor alpha:(CGFloat)alpha;

@end

2、UIColor+Extensions.m

#import "UIColor+Extensions.h"

@implementation UIColor (Extensions)

+ (UIColor *)colorWithHex:(long)hexColor {
    CGFloat red = ((CGFloat)((hexColor & 0xFF0000) >> 16))/255.0f;
    CGFloat green = ((CGFloat)((hexColor & 0xFF00) >> 8))/255.0f;
    CGFloat blue = ((CGFloat)(hexColor & 0xFF))/255.0f;
    return [UIColor colorWithRed:red green:green blue:blue alpha:1.0f];
}

+ (UIColor *)colorWithHex:(long)hexColor alpha:(CGFloat)alpha{
    CGFloat red = ((CGFloat)((hexColor & 0xFF0000) >> 16))/255.0f;
    CGFloat green = ((CGFloat)((hexColor & 0xFF00) >> 8))/255.0f;
    CGFloat blue = ((CGFloat)(hexColor & 0xFF))/255.0f;
    return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
}

@end

3、定义和使用

#define HEXCOLOR(hexColor) [UIColor colorWithHex:hexColor]

HEXCOLOR(0xff2a01)