ios - NSMutableDictionary 增删改 KVO

Question

我有一个关于 KVO 的快速问题。我知道对于 NSArray 如果需要观察添加，您可以执行以下操作。

 NSIndexSet* set = [NSIndexSet indexSetWithIndex:[someIndex integerValue]];
            [self willChange:NSKeyValueChangeInsertion valuesAtIndexes:set forKey:@"theArrayName"];
                // add the objects at the specified indexes here
            [self didChange:NSKeyValueChangeInsertion valuesAtIndexes:set forKey:@"theArrayName"];

注册观察后，您将获得一个包含已更改索引的更改字典。

但是，我不明白如何观察向 NSMutableDictionary 添加的新对象。有没有办法观察对象的添加/删除？

谢谢，

[编辑]我找到了满足我当前需求的解决方案。我希望以下内容对 future 的开发人员有所帮助。

[self willChangeValueForKey:@"someDictionary" withSetMutation:NSKeyValueUnionSetMutation usingObjects:[NSSet setWithObject:someObject]];

[Images setObject:someObject forKey:someIndex];

[self didChangeValueForKey:@"someDictionary" withSetMutation:NSKeyValueUnionSetMutation usingObjects:[NSSet setWithObject:someObject]];

Answer 1

只是为了确保这个问题得到回答。感谢@DoubleDunk

[self willChangeValueForKey:@"someDictionary" withSetMutation:NSKeyValueUnionSetMutation usingObjects:[NSSet setWithObject:someObject]];

    [Images setObject:someObject forKey:someIndex];

    [self didChangeValueForKey:@"someDictionary" withSetMutation:NSKeyValueUnionSetMutation usingObjects:[NSSet setWithObject:someObject]];