在iOS開發(fā)中议纯，經(jīng)常有用到對輸入的字符串進(jìn)行判斷∈眉蓿總結(jié)如下意鲸。

（1）有效的電話號碼

- (BOOL) isValidMobileNumber {
    NSString* const MOBILE = @"^1(3|4|5|7|8)\\d{9}$";
    NSPredicate* predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];
    return [predicate evaluateWithObject:self];
}

（2）有效的驗證碼(根據(jù)自家的驗證碼位數(shù)進(jìn)行修改)

- (BOOL) isValidVerifyCode{
    NSString *pattern = @"^[0-9]{4}";
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];
    return [predicate evaluateWithObject:self];
}

（3）有效的真實姓名

- (BOOL) isValidRealName{
    NSString *nicknameRegex = @"^[\u4e00-\u9fa5]{2,8}$";
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",nicknameRegex];
    return [predicate evaluateWithObject:self];
}

（4）是否只有中文

- (BOOL) isOnlyChinese{
    NSString * chineseTest=@"^[\u4e00-\u9fa5]{0,}$";
    NSPredicate*chinesePredicate=[NSPredicate predicateWithFormat:@"SELF MATCHES %@",chineseTest];
    return [chinesePredicate evaluateWithObject:self];
}

（5）有效的銀行卡號

- (BOOL) isValidBankCardNumber {
    NSString* const BANKCARD = @"^(\\d{16}|\\d{19})$";
    NSPredicate* predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", BANKCARD];
    return [predicate evaluateWithObject:self];
}

（6）有效的郵箱

- (BOOL) isValidEmail{
    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:self];
}

（7）昵稱驗證

- (BOOL) validateNickName{
    NSString *userNameRegex = @"^[A-Za-z0-9\u4e00-\u9fa5]{1,24}+$";
    NSPredicate *userNamePredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",userNameRegex];
    return [userNamePredicate evaluateWithObject:self];
}

（8）有效的字母數(shù)字密碼

- (BOOL) isValidAlphaNumberPassword{
    NSString *regex = @"^(?!\\d+$|[a-zA-Z]+$)\\w{6,12}$";
    NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
    return [identityCardPredicate evaluateWithObject:self];
}

（9）檢測有效身份證 （15位）

- (BOOL) isValidIdentifyFifteen{
    NSString * identifyTest=@"^[1-9]\\d{7}((0\\d)|(1[0-2]))(([0|1|2]\\d)|3[0-1])\\d{3}$";
    NSPredicate*identifyPredicate=[NSPredicate predicateWithFormat:@"SELF MATCHES %@",identifyTest];
    return [identifyPredicate evaluateWithObject:self];
}

（10）檢測有效身份證（18位）

- (BOOL) isValidIdentifyEighteen{
    NSString * identifyTest=@"^[1-9]\\d{5}[1-9]\\d{3}((0\\d)|(1[0-2]))(([0|1|2]\\d)|3[0-1])\\d{3}([0-9]|X)$";
    NSPredicate*identifyPredicate=[NSPredicate predicateWithFormat:@"SELF MATCHES %@",identifyTest];
    return [identifyPredicate evaluateWithObject:self];
}

（11）限制只能輸入數(shù)字

- (BOOL) isOnlyNumber{
    BOOL res = YES;
    NSCharacterSet* tmpSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];
    int i = 0;
    while (i < self.length) {
        NSString * string = [self substringWithRange:NSMakeRange(i, 1)];
        NSRange range = [string rangeOfCharacterFromSet:tmpSet];
        if (range.length == 0) {
            res = NO;
            break;
        }
        i++;
    }
    return res;
}

（19）限制只能輸入數(shù)字和小數(shù)點且小數(shù)點后保留兩位

- (BOOL) isOnlyNumberCashRange:(NSRange)range{
    NSString * cash= (NSString*)self;
    NSScanner      *scanner    = [NSScanner scannerWithString:cash];
    NSCharacterSet *numbers;
    NSRange         pointRange = [self rangeOfString:@"."];
    if ( (pointRange.length > 0) && (pointRange.location < range.location  || pointRange.location > range.location + range.length) )
    {
        numbers = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];
    }
    else
    {
        numbers = [NSCharacterSet characterSetWithCharactersInString:@"0123456789."];
    }
    
    if ( [self isEqualToString:@""] && [cash isEqualToString:@"."] )
    {
        return NO;
    }
    if (range.location == 1) {
        if ([cash isEqualToString:@"."]) {
            return NO;
        }
    }
    short remain = 2; //默認(rèn)保留2位小數(shù)
    
    NSString *tempStr = [self stringByAppendingString:cash];
    NSUInteger strlen = [tempStr length];
    if(pointRange.length > 0 && pointRange.location > 0){ //判斷輸入框內(nèi)是否含有“.”。
        if([cash isEqualToString:@"."]){ //當(dāng)輸入框內(nèi)已經(jīng)含有“.”時算色，如果再輸入“.”則被視為無效。
            return NO;
        }
        if(strlen > 0 && (strlen - pointRange.location) > remain+1){ //當(dāng)輸入框內(nèi)已經(jīng)含有“.”螟够，當(dāng)字符串長度減去小數(shù)點前面的字符串長度大于需要要保留的小數(shù)點位數(shù)灾梦，則視當(dāng)次輸入無效。
            return NO;
        }
    }else{
        if (range.location>4) {
            if (![cash isEqualToString:@"."]) {
                return NO;
            }
        }
    }
    NSRange zeroRange = [self rangeOfString:@"0"];
    if(zeroRange.length == 1 && zeroRange.location == 0){ //判斷輸入框第一個字符是否為“0”
        if(![cash isEqualToString:@"0"] && ![cash isEqualToString:@"."] && [self length] == 1)
        { //當(dāng)輸入框只有一個字符并且字符為“0”時妓笙，再輸入不為“0”或者“.”的字符時若河，則將此輸入替換輸入框的這唯一字符。
            return NO;
        }
        else
        {
            if(pointRange.length == 0 && pointRange.location > 0){ //當(dāng)輸入框第一個字符為“0”時寞宫，并且沒有“.”字符時萧福，如果當(dāng)此輸入的字符為“0”，則視當(dāng)此輸入無效辈赋。
                if([cash isEqualToString:@"0"]){
                    return NO;
                }
            }
        }
    }
    
    NSString *buffer;
    if ( ![scanner scanCharactersFromSet:numbers intoString:&buffer] && ([cash length] != 0) )
    {
        return NO;
    }
    return YES;
}