Question

我有NSArray个NSDictionaries。我想创建一个具有相同数量NSArray的新NSDictionaries，但我只想要字典中的一些键，而不是所有键。

示例：

Array有2个词典。每个字典都有密钥name, age, address, email, phone。

我想要新的数组，它也有2个词典，但只有name and address个键。

Answer 1

我会做类似的事情：

NSMutableArray *replacementArray = [NSMutableArray array];

[existingArray enumerateObjectsUsingBlock:
    ^(NSDictionary *dictionary, NSUInteger idx, BOOL *stop)
    {
         NSDictionary *newDictionary = [NSDictionary dictionaryWithObjectsAndKeys:[dictionary objectForKey:@"name"], @"name", [dictionary objectForKey:@"address"], @"address", nil];
         [replacementArray addObject:newDictionary];
    }
];

Answer 2

尝试以下操作（与iOS 2 +兼容）：

NSMutableArray *newArray = [NSMutableArray array];
for (NSDictionary *origDict in origArray) { // Replace origArray with your array's name
    [newArray addObject:[NSDictionary dictionaryWithObjectsAndKeys:[origDict objectForKey@"name"], @"name", [origDict objectForKey@"address"], @"address", nil]];
}
NSArray *newImmutableArray = [newArray copy] // If you want to ensure your array is not mutable
// ...
[newImmutableArray release]; // To balance -copy above

Answer 3

试试这个

 for(i=0;i<[firstArray count];i++){

 NSArray *objectArray=[NSArray arrayWithObjects:[[firstArray objectAtIndex:i]objectForKey:@"name"],[[firstArray objectAtIndex:i]objectForKey:@"address"]];

 NSArray *keyArray=[NSArray arrayWithObjects:@"name",@"address"];
 NSDictionary *myDictionary=[NSDictionary dictionaryWithObjects:objectArray forKeys:keyArray];

 [secondArray addObject:myDictionary];
}

如何修改字典数组？

3 个答案: