Question

我目前正在使用以下算法搜索我的iPhone应用程序：

NSRange range = [entry.englishEntry rangeOfString:searchText options:NSCaseInsensitiveSearch];
        if(range.location != NSNotFound)
        {
            [self.filteredListContent addObject:entry];
        }

问题在于，当我搜索像'废话'这样的单词时，我也会得到像'scrap'这样无关紧要的单词的结果。我对NSRange不熟悉，那么搜索整个单词的搜索算法是什么？

Answer 1

我刚刚通过在NSString上添加一个简单类别来进行单词边界搜索来解决这个问题。这是代码：

@interface NSString (FullWordSearch)

// Search for a complete word. Does not match substrings of words. Requires fullWord be present
// and no surrounding alphanumeric characters.
- (BOOL)containsFullWord:(NSString *)fullWord;

@end

@implementation NSString (FullWordSearch)

- (BOOL)containsFullWord:(NSString *)fullWord {
    NSRange result = [self rangeOfString:fullWord];
    if (result.length > 0) {
        if (result.location > 0 && [[NSCharacterSet alphanumericCharacterSet] characterIsMember:[self characterAtIndex:result.location - 1]]) {
            // Preceding character is alphanumeric
            return NO;
        }
        if (result.location + result.length < [self length] && [[NSCharacterSet alphanumericCharacterSet] characterIsMember:[self characterAtIndex:result.location + result.length]]) {
            // Trailing character is alphanumeric
            return NO;
        }
        return YES;
    }
    return NO;
}

@end

Answer 2

是的，你可以用文字搜索。您需要先将字符串拆分为组件。然后遍历每个并比较它们。

类似的东西：

  NSArray *words = [entry.english componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
  for (NSString *word in words)
  { 
      NSComparisonResult result = [word compare:searchText options:(NSCaseInsensitiveSearch|NSDiacriticInsensitiveSearch) range:NSMakeRange(0, [searchText length])];
      if (result == NSOrderedSame)
      {
        [self.filteredListContent addObject:entry];
        break;
      }
  }

Answer 3

不是查找字符串的范围，而是进行不区分大小写的比较并检查结果是否为NSOrderedSame

if([entry.english caseInsensitiveCompare:searchText] == NSOrderedSame){
  [self.filteredListContent addObject:entry];
}

这会将文本与整个单词进行比较，而不只是查找范围。

Answer 4

现在我将它变得更通用，通过使用此代码，您可以搜索目标字符串

之间的任何字符串

    NSString * strName =[entry.english lowercaseString];

    if ([strName rangeOfString:[searchText lowercaseString]].location != NSNotFound) {
         [self.filteredListContent addObject:entry];}

iPhone'全字'搜索

4 个答案: