UIColor之【擴展：#FFFFFF ->UIColor】

+(UIColor*)colorWithHexString:(NSString *)hexColor{
    
    if ([hexColor length] == 7 && [hexColor hasPrefix:@"#"]) {

        unsigned int red, green, blue;
        NSRange range;
        range.length = 2;
        
        range.location = 1;
        [[NSScanner scannerWithString:[hexColor substringWithRange:range]]scanHexInt:&red];
        
        range.location = 3;
        [[NSScanner scannerWithString:[hexColor substringWithRange:range]]scanHexInt:&green];
        
        range.location = 5;
        [[NSScanner scannerWithString:[hexColor substringWithRange:range]]scanHexInt:&blue];
        
        return [UIColor colorWithRed:((float)red/255.0f) green:((float)green/255.0f) blue:((float)blue/255.0f) alpha:1.0f];
    }
    return [UIColor clearColor];
}