对我来说，问题是我忘记在.m(实现)中为我的常量设置值

file const kFooKey = @"Foo";

常见的原因

导致“架构armv7中未定义的符号”的常见原因有:

You import a header and do not link against the correct library. This is common, especially for headers for libraries like QuartzCore since it is not included in projects by default. To resolve: Add the correct libraries in the Link Binary With Libraries section of the Build Phases. If you want to add a library outside of the default search path you can include the path in the Library Search Paths value in the Build Settings and add -l{library_name_without_lib_and_suffix} (eg. for libz.a use -lz) to the Other Linker Flags section of Build Settings. You copy files into your project but forgot to check the target to add the files to. To resolve: Open the Build Phases for the correct target, expand Compile Sources and add the missing .m files. If this is your issue please upvote Cortex's answer below as well. You include a static library that is built for another architecture like i386, the simulator on your host machine. To resolve: If you have multiple library files from your libraries vendor to include in the project you need to include the one for the simulator (i386) and the one for the device (armv7 for example). Optionally, you could create a fat static library that contains both architectures.

最初的回答:

您没有链接到正确的libz文件。如果你右键点击该文件并在finder中显示它的路径应该在iOS sdk文件夹中的某个地方。这是我的例子

/开发/平台/ iPhoneOS.platform /开发/ sdk / iPhoneOS4.3.sdk / usr / lib

我建议删除引用，然后在目标的构建阶段Link Binary With Libraries部分重新添加它。

对我来说，问题是我忘记在.m(实现)中为我的常量设置值

file const kFooKey = @"Foo";

当模块(file .m)不在我正在使用的目标中时，我常常会遇到这个问题。

我在安装shareKit时遇到了这个问题。它可以在模拟器中运行，但不能在设备上运行。我从其他链接器标志中删除了-all_load，一切都在模拟器和iphone设备中正常工作。

当我加入第三方框架时，我也遇到了同样的问题。

当我从目标的构建设置中的有效架构条目中删除armv7s时，问题得到了解决，它开始工作。