Xcode 6.1 上 x86_64 架构的未定义符号 [英] Undefined symbols for architecture x86_64 on Xcode 6.1

问题描述

Xcode 在编译时突然向我抛出了这个错误:

All of a sudden Xcode threw me this error at compilation time:

Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_Format", referenced from:
 objc-class-ref in WOExerciseListViewController.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

经过一些研究，我可能了解到我使用的库与 64 位版本不兼容.但这很奇怪，因为我已经使用相同的库至少一个星期了，在那段时间没有遇到任何编译问题.这两个库只是由一堆类组成，当我从我的项目中删除它们时，我遇到了同样的问题.由于我自己从未创建过库，因此我不知道如何找到我正在使用的库是否与 64 位 (?)我还尝试对目标面板下的架构进行以下更改:

After doing some research, I may understand that a library I'm using is not compatible with 64 bit version. But this is very strange since I've been working with the same libraries for at least a week without having a single compilation problem during that time. The two libraries are just composed of a bunch of classes, and when I removed them from my project I got the same issue. Since I have never created libraries myself, I have no idea how I can find wether the ones I'm using are compatible with 64 bit (?) I also tried the following changes for architectures under the target panel :

• 在架构中添加了 $(ARCHS_STANDARD_INCLUDING_64_BIT)
• 仅构建活动架构 -> 设置为NO"
• 对于有效架构" -> 设置为 arm64、armv7 和 armv7s
• 删除了 DerivedData 文件夹及其内容，重新清理和构建

但是这些更改都不起作用.请问有人有这方面的线索吗?谢谢

But none of these changes work. Please, does someone have a clue on this? Thanks

推荐答案

显然，您的格式"类与问题有关.检查你对这个类的声明，特别是如果你在另一个类中做了它，你可能忘记了@implementation 或类似的东西.

Apparently, your class "Format" is involved in the problem. Check your declaration of this class, especially if you did it inside another class you probably forgot the @implementation or something similar.

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