如何使用 NSPredicate 过滤数组以进行单词组合

本文介绍了如何使用 NSPredicate 过滤数组以进行单词组合的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

[filteredArray filterUsingPredicate:
   [NSPredicate predicateWithFormat:@"self BEGINSWITH[cd] %@", searchText]];

filteredArray 包含简单的 NSStrings.[hello, my, get, up, 7, etc...];

filteredArray contains simple NSStrings. [hello, my, get, up, seven, etc...];

它将给出所有以 searchText 开头的字符串.

It will give all strings that begin with searchText.

但如果字符串是我的名字是"和searchText = name 等词的组合.NSPredicate 会是什么样子来实现这一点?

But if string will be a combination of words like "my name is", and searchText = name. What would a NSPredicate look like to achieve this?

更新:如果我想要 searchText = name 的结果，而不是 searchText = ame 的结果，那该怎么办?也许是这样的:

UPDATE:And how would it have to be if i want to a result with searchText = name, but not with searchText = ame? Maybe like this:

 [filteredArray filterUsingPredicate:
       [NSPredicate predicateWithFormat:
        @"self BEGINSWITH[cd] %@ or self CONTENTS[cd] %@", 
        searchText, searchText]];

但它应该首先显示以 searchText 开头的字符串，并且只在包含 searchText 的字符串之后显示.

But it should first display the strings that begin with searchText and only after those which contain searchText.

推荐答案

[NSPredicate predicateWithFormat:@"self CONTAINS[cd] %@", searchText];

问题扩展后编辑

NSArray *beginMatch = [filteredArray filteredArrayUsingPredicate:
  [NSPredicate predicateWithFormat:
    @"self BEGINSWITH[cd] %@", searchText]];
NSArray *anyMatch = [filteredArray filteredArrayUsingPredicate:
  [NSPredicate predicateWithFormat:
    @"self CONTAINS[cd] %@", searchText]];

NSMutableArray *allResults = [NSMutableArray arrayWithArray:beginMatch];
for (id obj in anyMatch) {
   if (![allResults containsObject:obj]) {
      [allResults addObject:obj];
   }
}
filteredArray = allResults;

这将按所需顺序生成结果，而不会出现重复条目.

This will have the results in the desired order without duplicate entries.

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