NSString中提取單詞 enumerateSubstringsInRange NSCharacterSet CFStringTokenizerRef

方法1:

NSString *popo = @"Lorem __ ! @ () "" ipsum "" dolar ?~  * # $  % ^ & < >{}\\ |;:sit  amet.";
    [popo enumerateSubstringsInRange:NSMakeRange(0, popo.length) options:NSStringEnumerationByWords usingBlock:^(NSString * _Nullable substring, NSRange substringRange, NSRange enclosingRange, BOOL * _Nonnull stop) {
        
        NSLog(@"substring     :%@",substring);
        NSLog(@"substringRange:%lu,length:%lu",(unsigned long)substringRange.location,substringRange.length);
        NSLog(@"enclosingRange:%lu,length:%lu \n\n",(unsigned long)enclosingRange.location,enclosingRange.length);
        
        
    }];

打印日誌：

2015-11-02 17:22:07.244 AFNetWorkingDemo[8620:300513] substring     :Lorem
2015-11-02 17:22:07.245 AFNetWorkingDemo[8620:300513] substringRange:0,length:5
2015-11-02 17:22:07.245 AFNetWorkingDemo[8620:300513] enclosingRange:0,length:6 

2015-11-02 17:22:07.245 AFNetWorkingDemo[8620:300513] substring     :__
2015-11-02 17:22:07.245 AFNetWorkingDemo[8620:300513] substringRange:6,length:2
2015-11-02 17:22:07.245 AFNetWorkingDemo[8620:300513] enclosingRange:6,length:11 

2015-11-02 17:22:07.245 AFNetWorkingDemo[8620:300513] substring     :ipsum
2015-11-02 17:22:07.245 AFNetWorkingDemo[8620:300513] substringRange:17,length:5
2015-11-02 17:22:07.245 AFNetWorkingDemo[8620:300513] enclosingRange:17,length:7 

2015-11-02 17:22:07.246 AFNetWorkingDemo[8620:300513] substring     :dolar
2015-11-02 17:22:07.246 AFNetWorkingDemo[8620:300513] substringRange:24,length:5
2015-11-02 17:22:07.246 AFNetWorkingDemo[8620:300513] enclosingRange:24,length:33 

2015-11-02 17:22:07.246 AFNetWorkingDemo[8620:300513] substring     :sit
2015-11-02 17:22:07.246 AFNetWorkingDemo[8620:300513] substringRange:57,length:3
2015-11-02 17:22:07.273 AFNetWorkingDemo[8620:300513] enclosingRange:57,length:5 

2015-11-02 17:22:07.273 AFNetWorkingDemo[8620:300513] substring     :amet
2015-11-02 17:22:07.273 AFNetWorkingDemo[8620:300513] substringRange:62,length:4
2015-11-02 17:22:07.273 AFNetWorkingDemo[8620:300513] enclosingRange:62,length:5 

方法2:

CFStringRef string1 = (__bridge CFStringRef)([NSString stringWithFormat:@"Lorem    ipsum dolar   sit  amet."]); // Get string from somewhere
    CFLocaleRef locale = CFLocaleCopyCurrent();
    CFStringTokenizerRef tokenizer =
    CFStringTokenizerCreate(
                            kCFAllocatorDefault
                            , string1
                            , CFRangeMake(0, CFStringGetLength(string1))
                            , kCFStringTokenizerUnitWord
                            , locale);
    CFStringTokenizerTokenType tokenType = kCFStringTokenizerTokenNone;
    unsigned tokensFound = 0;
    while(kCFStringTokenizerTokenNone !=
          (tokenType = CFStringTokenizerAdvanceToNextToken(tokenizer))) {
        CFRange tokenRange = CFStringTokenizerGetCurrentTokenRange(tokenizer);
        CFStringRef tokenValue =
        CFStringCreateWithSubstring(
                                    kCFAllocatorDefault
                                    , string1
                                    , tokenRange);
        // Do something with the token
        NSLog(@"tokenValue:%@",tokenValue);
        NSLog(@"tokenRange:%ld,%ld",tokenRange.location,tokenRange.length);

        CFShow(tokenValue);
        CFRelease(tokenValue);
        ++tokensFound;
    }
    // Clean up
    CFRelease(tokenizer);
    CFRelease(locale);

打印日誌：

2015-11-02 17:22:07.276 AFNetWorkingDemo[8620:300513] string:Lorem ipsum dolar sit amet.
2015-11-02 17:22:07.276 AFNetWorkingDemo[8620:300513] sss:Loremipsumdolarsitamet.
2015-11-02 17:22:07.277 AFNetWorkingDemo[8620:300513] tokenValue:Lorem
2015-11-02 17:22:07.277 AFNetWorkingDemo[8620:300513] tokenRange:0,5
Lorem
2015-11-02 17:22:07.277 AFNetWorkingDemo[8620:300513] tokenValue:ipsum
2015-11-02 17:22:07.277 AFNetWorkingDemo[8620:300513] tokenRange:9,5
ipsum
2015-11-02 17:22:07.277 AFNetWorkingDemo[8620:300513] tokenValue:dolar
2015-11-02 17:22:07.277 AFNetWorkingDemo[8620:300513] tokenRange:15,5
dolar
2015-11-02 17:22:07.277 AFNetWorkingDemo[8620:300513] tokenValue:sit
2015-11-02 17:22:07.277 AFNetWorkingDemo[8620:300513] tokenRange:23,3
sit
2015-11-02 17:22:07.278 AFNetWorkingDemo[8620:300513] tokenValue:amet
2015-11-02 17:22:07.278 AFNetWorkingDemo[8620:300513] tokenRange:28,4
amet

方法3:

    NSString *string = @"Lorem    ipsum dolar   sit  amet.";
    string = [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
    
    NSArray *components = [string componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
    NSLog(@"%@",components);
    components = [components filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"self <> ''"]];
    NSLog(@"%@",components);

    string = [components componentsJoinedByString:@" "];
    NSLog(@"string:%@",string);

打印日誌：

2015-11-02 17:22:07.275 AFNetWorkingDemo[8620:300513] (
    Lorem,
    "",
    "",
    "",
    ipsum,
    dolar,
    "",
    "",
    sit,
    "",
    "amet."
)
2015-11-02 17:22:07.275 AFNetWorkingDemo[8620:300513] (
    Lorem,
    ipsum,
    dolar,
    sit,
    "amet."
)
2015-11-02 17:22:07.276 AFNetWorkingDemo[8620:300513] string:Lorem ipsum dolar sit amet.