问题描述
Objective-C中有什么类似于C#yield return?
is there anything in Objective-C similar to C# yield return?
推荐答案
不，Objective-C中没有什么可以让您轻松构建可迭代的解决方案.
No, there is nothing in Objective-C that would let you built an iterable solution that easily.
通常， fast Objective-C中的枚举 是使用与C#，Java或C ++完全不同的机制构建的.采用该协议相对来说比较复杂，特别是与带有yield return的C#相比，尽管它肯定是可行的.
In general, fast enumeration in Objective-C is built using an entirely different mechanism from C#, Java, or C++. Adopting the protocol is relatively complex, especially compared to C# with its yield return, though it is certainly doable.
我发现，Objective-C块为快速枚举提供了一种有用的替代方法.考虑实现基于块的枚举而不是快速枚举-它使您可以使用类似于yield return的样式来编写自己的API.另一方面，API的客户端需要提供一个块才能使用您的枚举.这不是理想的方法，但是可以使用，尤其是对于复杂的枚举器，例如基于树的枚举器.
I found that Objective-C blocks provide a usable alternative to fast enumeration. Consider implementing a block-based enumeration instead of fast enumeration - it lets you program your own API using the style similar to yield return. On the flip side, the clients of your API would need to supply a block to use your enumeration. This is not ideal, but usable, especially for complex enumerators, such as ones based on trees.
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