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Lighter and Darker Shade of a given UIColor

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The code example below demonstrate how you can get a lighter and darker shade of a given color, useful in applications having dynamic themes

For Darker Color 

+ (UIColor *)darkerColorForColor:(UIColor *)c
{
    CGFloat r, g, b, a;
    if ([c getRed:&r green:&g blue:&b alpha:&a])
        return [UIColor colorWithRed:MAX(r - 0.2, 0.0)
                               green:MAX(g - 0.2, 0.0)
                                blue:MAX(b - 0.2, 0.0)
                               alpha:a];
    return nil;
}

For Lighter Color 

+ (UIColor *)lighterColorForColor:(UIColor *)c
{
    CGFloat r, g, b, a;
    if ([c getRed:&r green:&g blue:&b alpha:&a])
        return [UIColor colorWithRed:MIN(r + 0.2, 1.0)
                               green:MIN(g + 0.2, 1.0)
                                blue:MIN(b + 0.2, 1.0)
                               alpha:a];
    return nil;
}

See Visual differences below, considering given color is [UIColor orangeColor]

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UIColor:
* Creating a UIColor
* Creating a UIColor from hexadecimal number or string
* Color with Alpha component
* Undocumented Methods
* UIColor from an image pattern
* Make user defined attributes apply the CGColor datatype
* Lighter and Darker Shade of a given UIColor
* Adjusted Brightness of Color from UIColor
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0 Getting started with iOS
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2 Change Status Bar Color
3 Passing Data between View Controllers
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143 AirPrint tutorial
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176 Extension for rich Push Notification
177 Profiling with Instruments
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183 Custom methods of selection of UITableViewCells
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199 Create a video from images
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206 Creating an App ID
207 Changing the rootview controller
208 Attributed text in UILabel
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210 Contributors