作为Foundation下面具备强大功能的自然语言处理的框架，能够对自然语言的字符串进行解析 找到一句话的语言结构 例如

//  ViewController.m

//  NSLinguisticTagger

//

//  Created by MR-BusWang on 16/11/29.

//  Copyright © 2016年 乾坤翰林. All rights reserved.

//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)setup{

NSString *question = @"what is the weather in china";

NSLinguisticTaggerOptions options = NSLinguisticTaggerOmitWhitespace|NSLinguisticTaggerJoinNames|NSLinguisticTaggerOmitPunctuation;

NSLinguisticTagger *tagger = [[NSLinguisticTagger alloc] initWithTagSchemes:[NSLinguisticTagger availableTagSchemesForLanguage:@"en"] options:options];

tagger.string = question;

[tagger enumerateTagsInRange:NSMakeRange(0, question.length) scheme:NSLinguisticTagSchemeNameTypeOrLexicalClass options:options usingBlock:^(NSString * _Nonnull tag, NSRange tokenRange, NSRange sentenceRange, BOOL * _Nonnull stop) {

NSString *token= [question substringWithRange:tokenRange];

NSLog(@"%@,%@",token,tag);

}];

}

- (void)viewDidLoad {

[super viewDidLoad];

[self setup];

@end