很多APP都会构建登录界面，我想分享我在搭建登录界面时用到的一些判断。
　　传送门：iOS开发 登录界面(界面版)

账号

判断用户的输入为邮箱？

/**
 判断邮箱地址是否正确

 @param email 邮箱账号
 @return 结果
 */
+ (BOOL) validateEmail:(NSString *)email{
    //去掉所有的空格
    email = [email stringByReplacingOccurrencesOfString:@" " withString:@""];
    
    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];
}

判断用户的输入为手机号？

/**
 判断手机号码格式是否正确

 @param mobile 用户的手机号（字符串）
 @return 结果
 */
+ (BOOL)valiMobile:(NSString *)mobile
{
    //去掉所有的空格
    mobile = [mobile stringByReplacingOccurrencesOfString:@" " withString:@""];
    if (mobile.length != 11)
    {
        return NO;
    }else{
        /**
         * 移动号段正则表达式
         */
        NSString *CM_NUM = @"^((13[4-9])|(147)|(15[0-2,7-9])|(178)|(18[2-4,7-8]))\\d{8}|(1705)\\d{7}$";
        /**
         * 联通号段正则表达式
         */
        NSString *CU_NUM = @"^((13[0-2])|(145)|(15[5-6])|(176)|(18[5,6]))\\d{8}|(1709)\\d{7}$";
        /**
         * 电信号段正则表达式
         */
        NSString *CT_NUM = @"^((133)|(153)|(177)|(18[0,1,9]))\\d{8}$";
        NSPredicate *pred1 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM_NUM];
        BOOL isMatch1 = [pred1 evaluateWithObject:mobile];
        NSPredicate *pred2 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU_NUM];
        BOOL isMatch2 = [pred2 evaluateWithObject:mobile];
        NSPredicate *pred3 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT_NUM];
        BOOL isMatch3 = [pred3 evaluateWithObject:mobile];
        
        if (isMatch1 || isMatch2 || isMatch3) {
            return YES;
        }else{
            return NO;
        }
    }
}

判断用户的输入为身份证号？

/**
 判断身份证号是否正确

 @param )identityCard 身份证号
 @return 结果
 *
+ (BOOL) validateIdentityCard: (NSString *)identityCard{
    //去掉所有的空格
    identityCard = [identityCard stringByReplacingOccurrencesOfString:@" " withString:@""];
    //身份证的位数为18位
    if (identityCard.length == 18) {
        NSString *regex = @"^(\\d{14}|\\d{17})(\\d|[xX])$";
        NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
        return [identityCardPredicate evaluateWithObject:identityCard];
    }else{
        return NO;
    }
}

判断账号是否同时包含字符串和数字

/**
 判断字符串是否同时包含字母和数字
 
 @param numAndChar 字符串
 @return 结果
 */
-(BOOL)validateWithNumAndChar:(NSString *)numAndChar{
    //去掉所有的空格
    numAndChar = [numAndChar stringByReplacingOccurrencesOfString:@" " withString:@""];
    
    //筛选数字条件
    NSRegularExpression *NumRegularExpression = [NSRegularExpression regularExpressionWithPattern:@"[0-9]" options:NSRegularExpressionCaseInsensitive error:nil];
    NSUInteger NumMatchCount = [NumRegularExpression numberOfMatchesInString:numAndChar options:NSMatchingReportProgress range:NSMakeRange(0, numAndChar.length)];
    
    if(NumMatchCount == numAndChar.length){
        //纯数字
        return NO;
    }
    
    //筛选字母条件
    NSRegularExpression *LetterRegularExpression = [NSRegularExpression regularExpressionWithPattern:@"[A-Za-z]" options:NSRegularExpressionCaseInsensitive error:nil];
    NSUInteger LetterMatchCount = [LetterRegularExpression numberOfMatchesInString:numAndChar options:NSMatchingReportProgress range:NSMakeRange(0, numAndChar.length)];
    
    if(LetterMatchCount == numAndChar.length){
        //纯字母
        return NO;
    }
    
    if(NumMatchCount + LetterMatchCount == numAndChar.length){
        //包含字母和数字
        return YES;
    }else{
        //包含字母和数字之外的其他字符
        return NO;
    }
}