为此写了一个分类
NSString+Check.h

#import <Foundation/Foundation.h>

@interface NSString (Check)

/*手机号*/
+ (BOOL)isMobileNumber:(NSString *)mobileNum;
/*浮点数*/
+ (BOOL)isFloatNumber:(NSString *)numberString;
/*正整数*/
+ (BOOL)isPositiveNum:(NSString *)numberString;
/*邮箱*/
+ (BOOL)validateEmail:(NSString *)email;
/*身份证*/
+ (BOOL)validateIdentityCard: (NSString *)identityCard;

@end

NSString+Check.m

#import "NSString+Check.h"

@implementation NSString (Check)

+ (BOOL)isMobileNumber:(NSString *)mobileNum
{
    if (mobileNum.length != 11) {
        return NO;
    }
    
    /**
     * 手机号码:
     * 13[0-9], 14[5,7], 15[0, 1, 2, 3, 5, 6, 7, 8, 9], 17[0, 1, 6, 7, 8], 18[0-9]
     * 移动号段: 134,135,136,137,138,139,147,150,151,152,157,158,159,170,178,182,183,184,187,188
     * 联通号段: 130,131,132,145,155,156,170,171,175,176,185,186
     * 电信号段: 133,149,153,170,173,177,180,181,189
     */
    
    NSString *MOBILE = @"^1(3[0-9]|4[57]|5[0-35-9]|7[0135678]|8[0-9])\\d{8}$";
    /**
     * 中国移动：China Mobile
     * 134,135,136,137,138,139,147,150,151,152,157,158,159,170,178,182,183,184,187,188
     */
    NSString *CM = @"^1(3[4-9]|4[7]|5[0-27-9]|7[08]|8[2-478])\\d{8}$";
    
    /**
     * 中国联通：China Unicom
     * 130,131,132,145,155,156,170,171,175,176,185,186
     */
    
    NSString *CU = @"^1(3[0-2]|4[5]|5[56]|7[0156]|8[56])\\d{8}$";
    
    /**
     * 中国电信：China Telecom
     * 133,149,153,170,173,177,180,181,189
     */
    NSString *CT = @"^1(3[3]|4[9]|53|7[037]|8[019])\\d{8}$";
    
    NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];
    NSPredicate *regextestcm = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM];
    
    NSPredicate *regextestcu = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU];
    NSPredicate *regextestct = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT];
    
//    if (([regextestmobile evaluateWithObject:mobileNum] == YES)
//        || ([regextestcm evaluateWithObject:mobileNum] == YES)
//        || ([regextestct evaluateWithObject:mobileNum] == YES)
//        || ([regextestcu evaluateWithObject:mobileNum] == YES)) {
//        return YES;
//    }
//    else {
//        return NO;
//    }
    if (([regextestmobile evaluateWithObject:mobileNum] == YES)) {
        return YES;
    }
    else if (([regextestcm evaluateWithObject:mobileNum] == YES)) {
        NSLog(@"中国移动");
        return YES;
    }
     else if (([regextestct evaluateWithObject:mobileNum] == YES)) {
         NSLog(@"中国电信");
         return YES;
     }
     else if (([regextestcu evaluateWithObject:mobileNum] == YES)) {
         NSLog(@"中国联通");
         return YES;
     }else {
         return NO;
     }
}

//正整数
+ (BOOL)isPositiveNum:(NSString *)numberString
{
    NSString *numberRex = @"^\\+?[1-9][0-9]*$";
    NSPredicate *positiveNumberTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", numberRex];
    return [positiveNumberTest evaluateWithObject:numberString];
}

//非负浮点数
+ (BOOL)isFloatNumber:(NSString *)numberString
{
    NSString *numbderRegex = @"^\\+?(:?(:?\\d+\\.\\d+)|(:?\\d+))$";
    NSPredicate *numberTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", numbderRegex];
    return [numberTest evaluateWithObject:numberString];
}
//邮箱
+ (BOOL) validateEmail:(NSString *)email
{
    NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
    return [emailTest evaluateWithObject:email];
}
//身份证
+ (BOOL) validateIdentityCard: (NSString *)identityCard
{
    BOOL flag;
    if (identityCard.length <= 0) {
        flag = NO;
        return flag;
    }
    NSString *regex2 = @"^(\\d{14}|\\d{17})(\\d|[xX])$";
    NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];
    return [identityCardPredicate evaluateWithObject:identityCard];
}