A category for Sparrow 2.X that allows a SPQuad (or subclass) to get/set red, green, and blue color components.

SPQuad+ColorComponents.h

//
//  SPQuad+ColorComponents.h
//  Sparrow 2.X
//
//  Created by Shilo White on 7/9/13.
//

#import "SPQuad.h"

@interface SPQuad (ColorComponents)

- (id)initWithWidth:(float)width height:(float)height red:(uint)red green:(uint)green blue:(uint)blue premultipliedAlpha:(BOOL)pma;
- (id)initWithWidth:(float)width height:(float)height red:(uint)red green:(uint)green blue:(uint)blue;
+ (id)quadWithWidth:(float)width height:(float)height red:(uint)red green:(uint)green blue:(uint)blue;

- (void)setRed:(uint)red green:(uint)green blue:(uint)blue ofVertex:(int)vertexID;
- (void)setRedValue:(uint)red ofVertex:(int)vertexID;
- (void)setGreenValue:(uint)green ofVertex:(int)vertexID;
- (void)setBlueValue:(uint)blue ofVertex:(int)vertexID;

- (uint)redValueOfVertex:(int)vertexID;
- (uint)greenValueOfVertex:(int)vertexID;
- (uint)blueValueOfVertex:(int)vertexID;

@property (nonatomic, assign) uint redValue;
@property (nonatomic, assign) uint greenValue;
@property (nonatomic, assign) uint blueValue;

@end

SPQuad+ColorComponents.m

//
//  SPQuad+ColorComponents.m
//  Sparrow 2.X
//
//  Created by Shilo White on 7/9/13.
//

#import "SPQuad+ColorComponents.h"

@implementation SPQuad (ColorComponents)

- (id)initWithWidth:(float)width height:(float)height red:(uint)red green:(uint)green blue:(uint)blue premultipliedAlpha:(BOOL)pma
{
    return [self initWithWidth:width height:height color:SP_COLOR(red, green, blue) premultipliedAlpha:pma];
}

- (id)initWithWidth:(float)width height:(float)height red:(uint)red green:(uint)green blue:(uint)blue
{
    return [self initWithWidth:width height:height color:SP_COLOR(red, green, blue)];
}

+ (id)quadWithWidth:(float)width height:(float)height red:(uint)red green:(uint)green blue:(uint)blue
{
    return [[self alloc] initWithWidth:width height:height red:red green:green blue:blue];
}

- (void)setRed:(uint)red green:(uint)green blue:(uint)blue ofVertex:(int)vertexID
{
    [self setColor:SP_COLOR(red, green, blue) ofVertex:vertexID];
}

- (void)setRedValue:(uint)red ofVertex:(int)vertexID
{
    uint color = [self colorOfVertex:vertexID];
    [self setColor:SP_COLOR(red, SP_COLOR_PART_GREEN(color), SP_COLOR_PART_BLUE(color)) ofVertex:vertexID];
}

- (void)setGreenValue:(uint)green ofVertex:(int)vertexID
{
    uint color = [self colorOfVertex:vertexID];
    [self setColor:SP_COLOR(SP_COLOR_PART_RED(color), green, SP_COLOR_PART_BLUE(color)) ofVertex:vertexID];
}

- (void)setBlueValue:(uint)blue ofVertex:(int)vertexID
{
    uint color = [self colorOfVertex:vertexID];
    [self setColor:SP_COLOR(SP_COLOR_PART_RED(color), SP_COLOR_PART_GREEN(color), blue) ofVertex:vertexID];
}

- (uint)redValueOfVertex:(int)vertexID
{
    return SP_COLOR_PART_RED([self colorOfVertex:vertexID]);
}

- (uint)greenValueOfVertex:(int)vertexID
{
    return SP_COLOR_PART_GREEN([self colorOfVertex:vertexID]);
}

- (uint)blueValueOfVertex:(int)vertexID
{
    return SP_COLOR_PART_BLUE([self colorOfVertex:vertexID]);
}

- (void)setRedValue:(uint)red
{
    uint color = self.color;
    [self setColor:SP_COLOR(red, SP_COLOR_PART_GREEN(color), SP_COLOR_PART_BLUE(color))];
}

- (void)setGreenValue:(uint)green
{
    uint color = self.color;
    [self setColor:SP_COLOR(SP_COLOR_PART_RED(color), green, SP_COLOR_PART_BLUE(color))];
}

- (void)setBlueValue:(uint)blue
{
    uint color = self.color;
    [self setColor:SP_COLOR(SP_COLOR_PART_RED(color), SP_COLOR_PART_GREEN(color), blue)];
}

- (uint)redValue
{
    return [self redValueOfVertex:0];
}

- (uint)greenValue
{
    return [self greenValueOfVertex:0];
}

- (uint)blueValue
{
    return [self blueValueOfVertex:0];
}

@end