是NSMutableDictionary的字面创建比类辅助方法效率低吗？ [英] Is literal creation of an NSMutableDictionary less efficient than the class helper method?

问题描述

使用构造函数

[NSMutableDictionary dictionaryWithObjectsAndKeys:@"object1", @"key1", @2, @"key2", nil];

比获取文字的可变拷贝

[@{@"key1":@"object1", @"key2":@2} mutableCopy];

推荐答案

没有看到源代码，我可以想到为什么要更快的可能原因

Without looking at the source, I can think of possible reasons why either might be faster and that answer may change depending on # of entries.

真正的问题是，为什么你有一个应用程序架构在哪里重要？很少有一个应用程序创建这么多可变字典（或者字典太大），这是一个性能问题。

The real question, though, is why do you have an app architecture where it matters? It is quite rare to have an application that is creating so many mutable dictionaries (or dictionaries so large) that it is a performance issue.

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