在 iOS开发中往往会用到很多正则表达式, 和平时简单好用的方法,总结一下 分享给大家
移除空格

-(NSString *)removeWhiteSpace
{
    NSString *resultStr=@"";
    NSArray *arr=[self componentsSeparatedByString:@" "];
    for (NSString *str in arr)
    {
        resultStr = [resultStr stringByAppendingString:str];
    }
    return resultStr;
}

判断是否为浮点形：

- (BOOL)isPureFloatStr{
    NSScanner* scan = [NSScanner scannerWithString:self];
    float val;
    return[scan scanFloat:&val] && [scan isAtEnd];
}

邮箱

+ (BOOL) validateEmail:(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) validateMobile:(NSString *)mobile
{
    //手机号以13，14， 15，17,18开头，八个 \d 数字字符
    NSString *phoneRegex = @"(^1[3|4|5|7|8][0-9]{9}$)";
    NSPredicate *phoneTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",phoneRegex];
    return [phoneTest evaluateWithObject:mobile];
}

5 计算文字宽高

+(CGSize)getStringSize:(float)fontSize withString:(NSString*)str andWidth:(CGFloat)width
{
    return [str boundingRectWithSize:CGSizeMake(width, LONG_MAX) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:fontSize]} context:nil].size;
}

用户名 6到20 位

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

密码 6到20 位

+ (BOOL) validatePassword:(NSString *)passWord{
    
    NSString *passWordRegex = @"^(?![0-9]+$)(?![A-Za-z]+$)[0-9A-Za-z]{6,20}$";
    NSPredicate *passWordPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",passWordRegex];
    return [passWordPredicate evaluateWithObject:passWord];
    
}

身份证号

+ (BOOL) validateIdentityCard: (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];
}

格式化时间

+(NSString *)fomartDate:(NSString *)Date{
    long long time=[Date doubleValue];
    NSDate *nd = [NSDate dateWithTimeIntervalSince1970:time];
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"yyyy/MM/dd"];
    NSString *dateString = [dateFormat stringFromDate:nd];
    return dateString;
}

微信支付获取手机 IP

#import <ifaddrs.h>
#import <arpa/inet.h>
+ (NSString *)getPhoneIP {
    NSString *address = @"error";
    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;
    int success = 0;
    // retrieve the current interfaces - returns 0 on success
    success = getifaddrs(&interfaces);
    if (success == 0) {
        // Loop through linked list of interfaces
        temp_addr = interfaces;
        while(temp_addr != NULL) {
            if(temp_addr->ifa_addr->sa_family == AF_INET) {
                // Check if interface is en0 which is the wifi connection on the iPhone
                if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
                    // Get NSString from C String
                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
                }
            }
            temp_addr = temp_addr->ifa_next;
        }
    }
    // Free memory
    freeifaddrs(interfaces);
    if ([address isEqualToString:@"error"])
    {
        address = @"192.168.1.1";
    }
    return address;
    
}

判断密码的强弱

-(BOOL)weakPswd{
    NSString *pswdEx =@"^(?=.*\\d.*)(?=.*[a-zA-Z].*).{6,20}$";
    NSPredicate *regExPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pswdEx];
    return [regExPredicate evaluateWithObject:self];
}

判断字符串是否为空

+(BOOL) isBlankString:(NSString *)string {
    if (string == nil || string == NULL) {
        return YES;
    }
    if ([string isKindOfClass:[NSNull class]]) {
        return YES;
    }
    if ([[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] length]==0) {
        return YES;
    }
    return NO;
}

验证银行卡

+(BOOL)isValidCardNumber:(NSString *)cardNumber
{
   NSString *digitsOnly = [self getDigitsOnly:cardNumber];
   int sum = 0;
   int digit = 0;
   int addend = 0;
   BOOL timesTwo = false;
   for (int i = digitsOnly.length  - 1.0; i >= 0; i--)
   {
       digit = [digitsOnly characterAtIndex:i] - '0';
       if (timesTwo)
       {
           addend = digit * 2;
           if (addend > 9) {
               addend -= 9;
           }
       }
       else {
           addend = digit;
       }
       sum += addend;
       timesTwo = !timesTwo;
   }
   int modulus = sum % 10;
   return modulus == 0;
}

+(NSString *)getDigitsOnly:(NSString*)s{
   NSString *digitsOnly = @"";
   char c;
   for (int i = 0; i < s.length; i++)
   {
       c = [s characterAtIndex:i];
       if (isdigit(c))
       {
           digitsOnly =[digitsOnly stringByAppendingFormat:@"%c",c];
       }
   }
   return digitsOnly;
}

是否为纯数字

-(BOOL)isNumberString
{
    NSCharacterSet *numberSet = [NSCharacterSet decimalDigitCharacterSet];
    NSCharacterSet *stringSet = [NSCharacterSet characterSetWithCharactersInString:self];
    if ([numberSet isSupersetOfSet:stringSet])
    {
        return YES;
    }
    else
    {
        return NO;
    }
}

校验护照

+ (BOOL) isValidPassport:(NSString*)value
{
    const char *str = [value UTF8String];
    char first = str[0];
    NSInteger length = strlen(str);
    if (!(first == 'P' || first == 'G'))
    {
        return FALSE;
    }
    if (first == 'P')
    {
        if (length != 8)
        {
            return FALSE;
        }
    }
    if (first == 'G')
    {
        if (length != 9)
        {
            return FALSE;
        }
    }
    BOOL result = TRUE;
    for (NSInteger i = 1; i < length; i++)
    {
        if (!(str[i] >= '0' && str[i] <= '9'))
        {
            result = FALSE;
            break;
        }
    }
    return result;
}