NSPredicate for an Array of NSDictionary keys

Question

我有

NSDictionary *myDictionary = @{ @"1":@"Egg Benedict",
                                @"2":@"Mushroom Risotto",
                                @"3":@"Full Breakfast",
                                @"4":@"Hamburger",
                                @"5":@"Ham and Egg Sandwich",
                                @"6":@"Cream Brelee"};
NSMutableArray *myKeys = [NSMutableArray arrayWithArray:[myDictionary allKeys]];

我想用谓词过滤我的词典。我应该如何构建它？作为一种算法，我想它应该是这样的：

[filteredKeys removeAllObjects];
for (NSString *a in myKeys) {
    if ([[myDictionary objectForKey:a] rangeOfString:searchText].location != NSNotFound) {
        [filteredKeys addObject:a];
    }
}

如何使用谓词字符串实现这一点？

Answer 1

您必须myObjects为可变的键数组，因此您可以过滤该数组。键只是字符串。其谓词应该是：

@"SELF contains[c] %@", searchText

过滤数组后，您可以使用以下命令获取更新的字典：

NSDictionary *filtered = [myDictionary dictionaryWithValuesForKeys:myObjects];