Enable hex value with UIColor

UIColor+Hex.h

//
//  UIColor+Hex.h
// 
//
//  Created by 超 沈 on 11-12-31.
//  Copyright (c) 2011年 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIColor (Hex)
+ (UIColor*)colorWithHex:(NSInteger)hexValue alpha:(CGFloat)alphaValue;
+ (UIColor*)colorWithHex:(NSInteger)hexValue;
+ (UIColor*)whiteColorWithAlpha:(CGFloat)alphaValue;
+ (UIColor*)blackColorWithAlpha:(CGFloat)alphaValue;
@end

UIColor+Hex.m

//
//  UIColor+Hex.m
// 
//
//  Created by 超 沈 on 11-12-31.
//  Copyright (c) 2011年 __MyCompanyName__. All rights reserved.
//

#import "UIColor+Hex.h"

@implementation UIColor (Hex)
+ (UIColor*)colorWithHex:(NSInteger)hexValue alpha:(CGFloat)alphaValue
{
    return [UIColor colorWithRed:((float)((hexValue & 0xFF0000) >> 16))/255.0 
                           green:((float)((hexValue & 0xFF00) >> 8))/255.0 
                            blue:((float)(hexValue & 0xFF))/255.0 alpha:alphaValue];
}

+ (UIColor*)colorWithHex:(NSInteger)hexValue
{
    return [UIColor colorWithHex:hexValue alpha:1.0];
}

+ (UIColor*)whiteColorWithAlpha:(CGFloat)alphaValue
{
    return [UIColor colorWithHex:0xffffff alpha:alphaValue];
}

+ (UIColor*)blackColorWithAlpha:(CGFloat)alphaValue
{
    return [UIColor colorWithHex:0x000000 alpha:alphaValue];
}

@end