从NSMutableDictionary中删除特定对象 [英] Remove specific objects from NSMutableDictionary

问题描述

我将不同的代码保存在NSMutableDictionary中，然后稍后检查字典中是否包含特定代码。

I am saving different codes in a NSMutableDictionary and checking later if a specific code is in the dict.

否，我想删除包含该代码的条目。

No I want to remove the entry which contain the code.

在这里，您将看到带有dict的数组的样子：

2013-04-28 12:43:23.877 myApp[9422:907] pushArray: (
    {
    code = 123;
    titel = "Test 01";
},
    {
    code = 456;
    titel = "Test 02";
},
    {
    code = 789;
    titel = "Test 03";
}
)

在这里您看到我如何搜索代码：

for(NSMutableDictionary * pushDict in pushArray) {
    NSString * codeFromDict = [pushDict objectForKey: @"code"];
    if([code_I_search isEqualToString: codeFromDict]){
        // This is called if the code is found
    }
}

这一切正常，但是现在我不知道如何删除条目...

This is all working fine, but now I don't now how to remove the entry...

结果应为：

如果我搜索代码 789 并说删除，则将其删除：

If I search for code 789 and say "remove" this would be removed:

{
code = 789;
titel = "Test 03";
}

我尝试了 [pushDict removeAllObjects]; 但那不起作用。

I tried [pushDict removeAllObjects]; but thats not working.

推荐答案

您要删除整个条目，对吗？

You want to remove that whole entry, right?

如果是这样，则将您的 pushArray 设置为 NSMutableArray ，然后就可以通过以下方式删除有问题的字典条目：

If so, then make your "pushArray" a NSMutableArray and then you can remove the offending dictionary entries via:

for(NSDictionary * pushDict in pushArray) {
    NSString * codeFromDict = [pushDict objectForKey: @"code"];
    if([code_I_search isEqualToString: codeFromDict]){
        [pushArray removeObject: pushDict];
    }
}

您在那里做事的方式正在从pushDict中删除所有对象，而不是从（不可变）数组中删除实际的pushDict对象。

The way you're doing it up there, you're removing all objects from the pushDict, but not the actual pushDict object from the (immutable) array.

这篇关于从NSMutableDictionary中删除特定对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！