获取“使用未声明的类型'NoError'"使用ReactiveCocoa [英] Getting "use of undeclared type 'NoError'" with ReactiveCocoa

问题描述

我正在尝试学习ReactiveCocoa并且很难开始。由于API和教程似乎很快就过时了，我不断遇到小麻烦。也许我有错误的印象。

只是想跟随

应该正确导入，因为我可以访问 Signal ， rac_textSignal 等但我不知道为什么NoError不可用。

他们的 documentation 提到 NoError 同样会导致 404 。

这过渡到RAC4 也提到了 NoError 。为什么 NoError 未声明？我正在使用ReactiveCocoa 4.0.1。

编辑：我刚刚将 public enum NoError：ErrorType {} 添加到文件的顶部，它现在有效。我不确定这是否是解决问题的正确方法。在指南和教程中没有提到我应该扩展 ErrorType 我自己。

解决方案

在4.0.1中删除了反应性可可原生 NoError ，转而支持结果中的noreferrer> antitypicals 实现（将 NoError 添加到结果，请参阅此）。参见例如问题＃2704

• https://github.com/ReactiveCocoa/ReactiveCocoa/issues/2704

我们可以看到这个明确使用过在源文件中，例如

• 在 =https://github.com/ReactiveCocoa/ReactiveCocoa/blob/master/ReactiveCocoa/Swift/Property.swift\"rel =noreferrer> Property.swift 。



因此，每当您打算使用 NoError时，您可能需要包含（antitypicals）结果 / code>。问题线程中的一个建议修复是

 公共类型NoError = Result.NoError 
  




I am trying to learn ReactiveCocoa and have a hard time getting started. I keep hitting minor bumps as API and tutorials seems to be outdated quickly. Maybe I have the wrong impression.

Just trying to follow this I do not seem to have NoError.

It should be imported correctly, since I have access to Signal, rac_textSignal etc. but I don't know why NoError is not available.

Their documentation mentions NoError as well but that leads to a 404.

This transition to RAC4 mentions NoError as well. Why is NoError undeclared? I am using ReactiveCocoa 4.0.1.

Edit: I just added public enum NoError : ErrorType {} to the top of the file and it works now. I am not sure if this is a proper solution to the problem though. It is not mentioned in guides and tutorials that I should extend ErrorType myself.

解决方案

The reactive cocoa native NoError was removed in 4.0.1 in favour of antitypicals implementation in Result (adds NoError to Result, see this). See e.g. issue #2704

• https://github.com/ReactiveCocoa/ReactiveCocoa/issues/2704

We can see this explicitly used in the source files, e.g.

• import enum Result.NoError in Property.swift.

Hence, you probably need to include (antitypicals) Result whenever you intend to use NoError. One suggested fix in the issue thread is

public typealias NoError = Result.NoError

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