如何查看Swift的"let"值Xcode 6调试器中的常量 [英] How to view value of Swift "let" constant in Xcode 6 debugger

问题描述

当我在Xcode 6中的调试器中停止时，如何查看用let声明的本地Swift常量的值?

When I'm stopped in the debugger in Xcode 6, how can I view the value of a local Swift constant declared with let?

如果我在Xcode 6中创建一个全新的Swift项目，并将以下两行添加到应用程序委托中的application(_:didFinishLaunchingWithOptions:):

If I create a brand new Swift project in Xcode 6 and add the following two lines to application(_:didFinishLaunchingWithOptions:) in the app delegate:

let someConstant = 5
var someVariable = 6

…然后运行应用程序，并在以下几行之后立即中断，这是我在调试器的变量视图中看到的内容:

…then run the app and break immediately after these lines, this is what I see in the variables view of the debugger:

为什么变量不显示其值，而常量却不显示? (为什么常数被列出两次?)

Why does the variable display its value, while the constant does not? (And why is the constant listed twice?)

如果在LLDB控制台中尝试在someConstant上使用p，po或fr v(全部正确显示someVariable的值)，我得到以下信息:

If, in the LLDB console, I try p, po, or fr v on someConstant (all of which correctly display the value of someVariable), I get the following:

我知道我可以在源代码中使用println在调试器中打印值，但是我真的不想每次都只想检查一个值时就具有远见卓识.我已声明为常量. (即使在LLDB控制台中运行expr println(someConstant)也会产生与p和po相同的无法解析的标识符"错误.)

I'm aware that I can print the value in the debugger by using println in my source code, but I'd really rather not have to have the foresight to do that every time I simply want to inspect a value I've declared as a constant. (Even running expr println(someConstant) in the LLDB console produced the same "unresolved identifier" error as p and po.)

这应该很容易.我想念什么?

This should be easy. What am I missing?

推荐答案

这是Xcode中的一个错误，我可以确认该错误已在Xcode 6.1中修复. (谢谢史蒂夫·罗森伯格.)

This was a bug in Xcode which I can confirm was fixed in Xcode 6.1. (Thanks, Steve Rosenberg.)

这是我现在所得到的，正如预期的那样:

This is what I get now, as expected:

该常量现在也可以正确显示在变量视图中，并且不再列出两次:

The constant is now displayed correctly in the variables view as well, and is no longer listed twice:

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