常的类方法

+(UIButton *)createButton:(CGRect)frame title:(NSString *)title image:(UIImage *)image target:(id)target selector:(SEL)selector
{
    UIButton * button=[UIButton buttonWithType:UIButtonTypeCustom];
    [button setImage:image forState:UIControlStateNormal];
    button.frame=frame;
    CGRect newFrame=frame;
    newFrame.origin.y=frame.size.height/2.0;
    newFrame.size.height=frame.size.height/2.0;
    newFrame.origin.x=0;
    UILabel * label=[[UILabel alloc]initWithFrame:newFrame];
    label.text=title;
    [button addSubview:label];
    label.font=[UIFont systemFontOfSize:12];
    label.backgroundColor=[UIColor clearColor];
    [button addTarget:target action:selector forControlEvents:UIControlEventTouchUpInside];
    return button;
}

+(CGFloat)widthOfString:(NSString *)string font:(UIFont *)font height:(CGFloat)height
{
    NSDictionary * dict=[NSDictionary dictionaryWithObject: font forKey:NSFontAttributeName];
    CGRect rect=[string boundingRectWithSize:CGSizeMake(CGFLOAT_MAX, height) options:NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesFontLeading|NSStringDrawingUsesLineFragmentOrigin attributes:dict context:nil];
    return rect.size.width;
}

+(CGFloat)heightOfString:(NSString *)string font:(UIFont *)font width:(CGFloat)width
{
    CGRect bounds;
    NSDictionary * parameterDict=[NSDictionary dictionaryWithObject:font forKey:NSFontAttributeName];
    bounds=[string boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX) options:NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesFontLeading|NSStringDrawingUsesLineFragmentOrigin attributes:parameterDict context:nil];
    return bounds.size.height;
}

#pragma  mark - 获取当天的日期：年月日
+ (NSDictionary *)getTodayDate
{
    
    //获取今天的日期
    NSDate *today = [NSDate date];
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSCalendarUnit unit = kCFCalendarUnitYear|kCFCalendarUnitMonth|kCFCalendarUnitDay;
    
    NSDateComponents *components = [calendar components:unit fromDate:today];
    NSString *year = [NSString stringWithFormat:@"%d", [components year]];
    NSString *month = [NSString stringWithFormat:@"%02d", [components month]];
    NSString *day = [NSString stringWithFormat:@"%02d", [components day]];
    
    NSMutableDictionary *todayDic = [[NSMutableDictionary alloc] init];
    [todayDic setObject:year forKey:@"year"];
    [todayDic setObject:month forKey:@"month"];
    [todayDic setObject:day forKey:@"day"];
    
    return todayDic;
    
}


#pragma  mark - 时间比较
+(NSString *)compareFromDate:(NSDate *)from toDate:(NSDate *)to
{
    
    if (!to || !from) {
        return @"";
    }
    
    // 日历
    NSCalendar * calendar = [NSCalendar currentCalendar];
    
    // 时间片段 ：年  月  日  时 分 秒
    int unit = NSCalendarUnitYear | NSCalendarUnitMonth  | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
    
    NSDateComponents * com = [calendar components:unit fromDate:from toDate:to options:0];
    
    NSString *string = [NSString stringWithFormat:@"剩余%d小时%d分钟", com.hour, com.minute];
    
    return string;
}







//邮箱
+ (BOOL) justEmail:(NSString *)email
{
    NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
    return [emailTest evaluateWithObject:email];
}


//手机号码验证
+ (BOOL) justMobile:(NSString *)mobile
{
    //手机号以13， 15，18开头，八个 \d 数字字符
    NSString *phoneRegex = @"^((13[0-9])|(15[^4,\\D])|(18[0,0-9]))\\d{8}$";
    NSPredicate *phoneTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",phoneRegex];
    return [phoneTest evaluateWithObject:mobile];
}


//车牌号验证
+ (BOOL) justCarNo:(NSString *)carNo
{
    NSString *carRegex = @"^[\u4e00-\u9fa5]{1}[a-zA-Z]{1}[a-zA-Z_0-9]{4}[a-zA-Z_0-9_\u4e00-\u9fa5]$";
    NSPredicate *carTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",carRegex];
    NSLog(@"carTest is %@",carTest);
    return [carTest evaluateWithObject:carNo];
}


//车型
+ (BOOL) justCarType:(NSString *)CarType
{
    NSString *CarTypeRegex = @"^[\u4E00-\u9FFF]+$";
    NSPredicate *carTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",CarTypeRegex];
    return [carTest evaluateWithObject:CarType];
}


//用户名
+ (BOOL) justUserName:(NSString *)name
{
    NSString *userNameRegex = @"^[A-Za-z0-9]{6,20}+$";
    NSPredicate *userNamePredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",userNameRegex];
    BOOL B = [userNamePredicate evaluateWithObject:name];
    return B;
}


//密码
+ (BOOL) justPassword:(NSString *)passWord
{
    NSString *passWordRegex = @"^[a-zA-Z0-9]{6,20}+$";
    NSPredicate *passWordPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",passWordRegex];
    return [passWordPredicate evaluateWithObject:passWord];
}


//昵称
+ (BOOL) justNickname:(NSString *)nickname
{
    NSString *nicknameRegex = @"^[\u4e00-\u9fa5]{4,8}$";
    NSPredicate *passWordPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",nicknameRegex];
    return [passWordPredicate evaluateWithObject:nickname];
}


//身份证号
+ (BOOL) justIdentityCard: (NSString *)identityCard
{
    BOOL flag;
    if (identityCard.length <= 0) {
        flag = NO;
        return flag;
    }
    NSString *regex2 = @"^(\\d{14}|\\d{17})(\\d|[xX])$";
    NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];
    return [identityCardPredicate evaluateWithObject:identityCard];
}