Xcode 4.2：如何从子项目导入.h文件

问题描述

我是Xcode子项目的新手。在我的iPhone应用程序项目 MyProject 中，我试图将一些常用代码重构为名为 MyLibrary 的静态库项目。在我创建 MyLibrary 并移动代码后， MyProject 不再编译。错误是 MyProject 无法在 MyLibrary 中看到.h文件。

I am new to Xcode subprojects. In my iPhone app project MyProject, I am trying to refactor some common code to a static library project called MyLibrary. After I create MyLibrary and move the code, MyProject is no-longer compiling. The error is that the MyProject cannot see the .h files in MyLibrary.

错误 MyLibraryConfig.h：没有这样的文件或目录即将出现：

#import "MyLibraryConfig.h"

• 如何在 MyProject 中导入 MyLibrary .h文件？


• 这里的最佳做法是什么？假设我有多个这样的库，将这些库添加到父项目的标题搜索路径是很繁琐的。


• How to import the MyLibrary .h files in MyProject ?
• What is the best practice here? Assuming I have multiple such libraries, it is tedious to add these to header search paths to the parent project.

推荐答案

也许您的头文件也在子目录中。

Maybe your header file is also in a subdirectory.

想象一下以下目录设置：

Imagine the following directory setup:

- Desktop
    - MyProject
        - MyProject.xcodeproj
        - main.m

        - MyLibrary
            - MyLibrary.xcodeproj
            - MyHeaderFile.h      <-- wanted header file

如果 main.m 包含以下内容：

#include "MyHeaderFile.h"

int main() {
    return 0;
}

编译器（gcc）会认为 MyHeaderFile.h 与 main.m 位于同一目录中，包含它。要告诉编译器你的意思是子文件夹中的头文件，你可以做两件事。

The compiler (gcc) will think that MyHeaderFile.h is located in the same directory as main.m, from which it is included. To tell the compiler you mean the header file in a subfolder, you have can do two things.



• 你可以在gcc中添加一个目录编译器说：嘿，也看看那个文件夹。您可以使用 -iquote myFolder 标志来执行此操作。


• 您可以在include语句中包含该目录： #includeMyLibrary / MyHeaderFile.h


• You can add a directory to the gcc compiler that says: "hey, also look in that folder". You can do this by using the -iquote myFolder flag.
• You can include the directory in the include-statement: #include "MyLibrary/MyHeaderFile.h"

当然还有其他问题，但这个接缝就像最直接的一样。

There could of course be another problem, but this seams like the most straightforward one.

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