在静态库中链接 Objective-C 类别
我正在为 iOS 应用程序开发一个插件。我将其编译成 .a 文件，然后由主 xcode 项目使用。
到目前为止，我已经在这个库中创建了 UIDevice 类的一个类别。当我使用这个库运行主项目时，它由于无法识别的选择器而崩溃
-[UIDevice platform]：发送到实例
平台的无法识别的选择器是我通过类别添加的功能之一。
所以我认为它根本没有链接这些函数，并将 ac 函数添加到与 UIDevice 类别相同的文件中，然后从我的代码中调用它。
这次主项目运行良好...所以我想也许是我做了其他事情并删除了 C 函数。但你瞧，由于无法识别的选择器，它再次崩溃了。
我的问题： 为什么 xcode 会忽略类别定义，除非我调用在同一文件中声明的函数？
是否有一个 xcode 设置我可以更改以使其包含 UIDevice 类别中的这些方法，无论我是否从该文件调用函数？
干杯
I am developing a plugin for an iOS application. I am compiling it into a .a file which is then used by the main xcode project.
So far I have create a category of the UIDevice class in this library. When I run the main project using this library it crashes due to an unrecognized selector
-[UIDevice platform]: unrecognized selector sent to instance
platform is one of the fuinctions I added via the category.
So I thought it wasn't linking those functions at all and added a c function to the same file as the UIDevice category then called it from my code .
This time the main project ran fine... So I thought maybe it was something else i did and removed the C function. But lo and behold it crashed again due to unrecognized selector..
My questions:
Why does xcode ignore the category definition unless I call a function declared in the same file?
Is there an xcode setting i can change to make it include these methods from the UIDevice category regardless of whether I call a function from that file or not?
cheers
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查看使用类别构建 Objective-C 静态库：
资料来源：@albertamg（链接静态库中的 Objective-C 类别)
Check out Building Objective-C static libraries with categories:
Source: @albertamg (linking objective-c categories in a static library)
我也遇到过同样的问题。在子项目中定义的类别中定义的方法导致无法识别的选择器异常。 （事实上，这表现为无法在 Interface Builder 中指定 UILabel 子类；XIB 包含 IB 中显示的类（UILabel 或 UIView，取决于我拖到那里的内容），而不是我输入的类，并且看起来像一个奇怪的 XCode bug。）
对我有用的解决方案是使用 -force_load：
在左侧面板中，选择您的主项目（根项目）。在右侧，您将看到
PROJECT和TARGETS。选择目标。转到“Build Settings”（在上方栏中）--“Linking”--“Other linker flags”，假设您的子项目名为 XXXXX，添加
-force_load ${BUILT_PRODUCTS_DIR}/libXXXXX.a（该项目有两个子项目，“调试”和“发布”，但您单击此复合项目，以便同时影响“调试”和“发布”）。
请注意，-force_load 适用于单个库，您可能需要为每个子项目库指定单独的 -force_load。
I have had the same problem. A method defined in a category defined in a subproject resulted in an unrecognized selector exception. (In fact, this manifested as inability to specify an UILabel subclass in Interface Builder; the XIB contained the class shown in IB (UILabel or UIView, depending on what I dragged there), rather than the class that I have typed in, and that looked as a weird XCode bug.)
The solution that worked for me has been to use -force_load:
In the left-hand panel, select your main project (the root item). On the right, you will see
PROJECTandTARGETS. SelectTARGETS.Go to "Build Settings"(in the upper bar) -- "Linking" -- "Other linker flags" and, assuming your subproject is called XXXXX, add
-force_load ${BUILT_PRODUCTS_DIR}/libXXXXX.athere (the item has two subitems, Debug and Release, but you click on this compound item so that if affects both Debug and Release).
Note that -force_load works for a single library, and you may need to specify a separate -force_load for each subproject library.
我遇到了这个问题，花了近1个小时才解决。感谢上帝！已经完成了。定义的方法应该是静态类型！
I had this issue and spent near 1 hour to resolve it. Thanks god! it's been done. Methods which are defined should be static type!