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Editorial Team
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Asked: 2026-06-08T22:22:26+00:00

Given: An existing NSMutableDictionary named oldDictionary. Goal: Copy oldDictionary to a another dictionary named

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Given:

An existing NSMutableDictionary named oldDictionary.

Goal:

Copy oldDictionary to a another dictionary named newDictionary and if
newDictionary has been modified – e.g., the values of some keys are changed – then oldDictionary should update to reflect the change as well.

Question:

What is the best way to do that?

Please advise me on this issue.

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1 Answer

  1. Editorial Team

    Not sure that’s the best way, i believe you can assign the observers for every key-value of the old one with

    addObserver:forKeyPath:options:context:

    processing every change at 

    observeValueForKeyPath:ofObject:change:context:

    Check the KVO reference for details. The reason of why that’s not implemented as a standard functionality must be because that’s an overkill.

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