字符串转颜色

@interface UIColor (BGHexColor)

+ (UIColor *)colorWithHex:(uint)hex alpha:(CGFloat)alpha;

/**
 *  十六进制字符串转颜色
 */
+ (UIColor *)colorWithHexString:(NSString *)HexString;

+ (UIColor *)colorWithHexString:(NSString *)HexString alpha:(CGFloat)alpha;

+ (UIColor*) colorRGBonvertToHSB:(UIColor*)color withBrighnessDelta:(CGFloat)delta;

+ (UIColor*) colorRGBonvertToHSB:(UIColor*)color withAlphaDelta:(CGFloat)delta;

+ (UIColor*) colorWithHex:(NSInteger)hexValue;

@end

@implementation UIColor (BGHexColor)

+ (UIColor *)colorWithHex:(uint)hex alpha:(CGFloat)alpha
{
    int red, green, blue;
    blue = hex & 0x0000FF;
    green = ((hex & 0x00FF00) >> 8);
    red = ((hex & 0xFF0000) >> 16);
    return [UIColor colorWithRed:red/255.0f green:green/255.0f blue:blue/255.0f alpha:alpha];
}

//字符串转颜色
+ (UIColor *)colorWithHexString:(NSString *)HexString
{
    NSString *cString = [[HexString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
    
    if ([cString length] < 6)
        return DEFAULT_VOID_COLOR;
    if ([cString hasPrefix:@"#"])
        cString = [cString substringFromIndex:1];
    if ([cString length] != 6)
        return DEFAULT_VOID_COLOR;
    
    NSRange range;
    range.location = 0;
    range.length = 2;
    NSString *rString = [cString substringWithRange:range];
    
    range.location = 2;
    NSString *gString = [cString substringWithRange:range];
    
    range.location = 4;
    NSString *bString = [cString substringWithRange:range];
    
    
    unsigned int r, g, b;
    [[NSScanner scannerWithString:rString] scanHexInt:&r];
    [[NSScanner scannerWithString:gString] scanHexInt:&g];
    [[NSScanner scannerWithString:bString] scanHexInt:&b];
    
    return [UIColor colorWithRed:((float) r / 255.0f)
                           green:((float) g / 255.0f)
                            blue:((float) b / 255.0f)
                           alpha:1.0f];
}

+ (UIColor *)colorWithHexString:(NSString *)HexString alpha:(CGFloat)alpha{
    NSString *cString = [[HexString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
    
    if ([cString length] < 6)
        return DEFAULT_VOID_COLOR;
    if ([cString hasPrefix:@"#"])
        cString = [cString substringFromIndex:1];
    if ([cString length] != 6)
        return DEFAULT_VOID_COLOR;
    
    NSRange range;
    range.location = 0;
    range.length = 2;
    NSString *rString = [cString substringWithRange:range];
    
    range.location = 2;
    NSString *gString = [cString substringWithRange:range];
    
    range.location = 4;
    NSString *bString = [cString substringWithRange:range];
    
    
    unsigned int r, g, b;
    [[NSScanner scannerWithString:rString] scanHexInt:&r];
    [[NSScanner scannerWithString:gString] scanHexInt:&g];
    [[NSScanner scannerWithString:bString] scanHexInt:&b];
    
    return [UIColor colorWithRed:((float) r / 255.0f)
                           green:((float) g / 255.0f)
                            blue:((float) b / 255.0f)
                           alpha:alpha];
}

+ (UIColor*) colorRGBonvertToHSB:(UIColor*)color withBrighnessDelta:(CGFloat)delta {
    CGFloat hue = 0.0f;
    CGFloat saturation = 0.0f;
    CGFloat brightness = 0.0f;
    CGFloat alpha = 0.0f;
    
    [color getHue:&hue saturation:&saturation brightness:&brightness alpha:&alpha];
    
    brightness += delta;
    
    return [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:alpha];
}

+ (UIColor*) colorRGBonvertToHSB:(UIColor*)color withAlphaDelta:(CGFloat)delta {
    CGFloat hue = 0.0f;
    CGFloat saturation = 0.0f;
    CGFloat brightness = 0.0f;
    CGFloat alpha = 0.0f;
    
    [color getHue:&hue saturation:&saturation brightness:&brightness alpha:&alpha];
    
    alpha += delta;
    
    return [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:alpha];
}
+ (UIColor*) colorWithHex:(NSInteger)hexValue
{
    return [UIColor colorWithRed:((float)((hexValue & 0xFF0000) >> 16))/255.0
                           green:((float)((hexValue & 0xFF00) >> 8))/255.0
                            blue:((float)(hexValue & 0xFF))/255.0 alpha:1.0];
}

@end