`po`给出错误：< EXPR>：1：1：error：使用未解析的标识符 [英] `po` gives `error: <EXPR>:1:1: error: use of unresolved identifier`

问题描述

我在控制台中的 po 有这个问题，试图输出一个函数本身工作，但输出一个变量或常数不。

I have this problem with po in the console where trying to output a function works in itself, but outputting a variable or constant doesn't.

正如你所看到的，虽然你认为var / let bar.boy（），Swift无法找到它...

As you can see here, although you'd think the var/let holds the content of bar.boy(), Swift somehow can't find it...

推荐答案

所以结果是，过去可能是一个错误，当你添加一个Swift文件，它会添加/问一个Bridging头，但它不会添加该行到你的项目

So it turns out there was probably a bug in the past that when you were adding a Swift file it would add/ask a Bridging header, but it wouldn't add that line to your project

SWIFT_OPTIMIZATION_LEVEL = "-Onone";

这意味着您将保持此状态

which means you'd stay in this state

导致错误：< EXPR>：1：1：错误：使用未解析的标识符！

因为我在我的项目中移动文件，当我添加ObjC文件到项目，它问我一个Bridging头（虽然我有一个已经！），幸运地添加， SWIFT_OPTIMIZATION_LEVEL 。可以考虑这是一个bug，考虑默认值是最快，但是我再一次，我想这只是一个错误，过去，现在固定。

I could only find that out because I moved around files in my project and when I added ObjC files to the project, it asked me about a Bridging header (although I had one already!) and luckily added that SWIFT_OPTIMIZATION_LEVEL. One could consider this is a bug to consider the default value is fastest, but then again I guess this was only a bug in the past and got fixed now.

仍然，我现在修复它可能是一个错误，如果它在发行版中添加 none 。我现在不能测试这个，因为测试这个我只有一个 Debug 构建。我将把它作为一个练习:)给苹果工程师。

Still, I fixed now it might be a bug the other way around, if it add none in the release build. I can't test this right now because for testing this I only had a Debug build. I'll leave that as an exercise :) for Apple's Engineers.

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