等效于Java ThreadLocal变量的Objective C / Swift

问题描述

在Java中，我们有 ThreadLocal 类：

In Java, we have the ThreadLocal class:

示例：

private static final ThreadLocal<StringBuilderHelper>
    threadLocalStringBuilderHelper = new ThreadLocal<StringBuilderHelper>() {
        @Override
        protected StringBuilderHelper initialValue() {
            return new StringBuilderHelper();
        }
    };

在Objective C或Swift中是否有任何等效模拟这种行为？我可以在Swift上使用：

Is there any equivalent in Objective C or Swift to simulate this behavior? Can i just use on Swift:

static let String = someInitialValue()

并实现相同的目标？

推荐答案

查看 NSThread threadDictionary 。我认为这大致相同。

Have a look at NSThread threadDictionary. I believe this is roughly the same thing.

Objective-C中的典型用法可能是：

A typical use in Objective-C might be:

NSMutableDictionary *threadData = [[NSThread currentThread] threadDictionary];
threadData[someKey] = someObject; // write

someObject = threadData[someKey]; // read

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