iOS - 自然语言NSLinguisticTagger

• 自然语言筛选代码及注释:

    //1.创建语句
    NSString * question = @"What is the weather in San Francisco?";
    //2.创建筛选条件
    NSLinguisticTaggerOptions options = NSLinguisticTaggerOmitWhitespace | NSLinguisticTaggerJoinNames |NSLinguisticTaggerOmitPunctuation;
    //3.创建自然语言标签
    NSLinguisticTagger * tagger = [[NSLinguisticTagger alloc]initWithTagSchemes:[NSLinguisticTagger availableTagSchemesForLanguage:@"en"] options:options];
    //4.给标签附字符串
    tagger.string = question;
    //5.执行筛选
    [tagger enumerateTagsInRange:NSMakeRange(0, question.length) scheme:NSLinguisticTagSchemeNameTypeOrLexicalClass  options:options usingBlock:^(NSString * _Nonnull tag, NSRange tokenRange, NSRange sentenceRange, BOOL * _Nonnull stop) {
       
        //6.获取结果
        NSString*token = [question substringWithRange:tokenRange];

        //7.打印结果
        NSLog(@"%@:%@",token,tag);
    }];

• 打印结果

    /**
     *  打印结果
     2015-10-23 10:07:04.599 NSLinguisticTaggerDemo[34466:941126] What:Pronoun
     2015-10-23 10:07:04.600 NSLinguisticTaggerDemo[34466:941126] is:Verb
     2015-10-23 10:07:04.600 NSLinguisticTaggerDemo[34466:941126] the:Determiner
     2015-10-23 10:07:04.600 NSLinguisticTaggerDemo[34466:941126] weather:Noun
     2015-10-23 10:07:04.600 NSLinguisticTaggerDemo[34466:941126] in:Preposition
     2015-10-23 10:07:04.600 NSLinguisticTaggerDemo[34466:941126] San Francisco:PlaceName
     */