Xcode 6.1上的体系结构x86_64的未定义符号 [英] Undefined symbols for architecture x86_64 on Xcode 6.1
问题描述
Xcode突然在编译时把这个错误告诉了我：
All of a sudden Xcode threw me this error at compilation time:
Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_Format", referenced from:
objc-class-ref in WOExerciseListViewController.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
在做了一些研究之后，我可能会理解一个库我正在使用与64位版本不兼容。但这是非常奇怪的，因为我在相同的库中工作至少一周而没有单一的编译问题。这两个库只是由一堆类组成的，当我从项目中删除它时，我遇到了同样的问题。由于我自己从未创建过库，因此我不知道如何找到我正在使用的库与64位兼容（？）
我还尝试对目标面板下的架构进行以下更改：
After doing some research, I may understand that a library I'm using is not compatible with 64 bit version. But this is very strange since I've been working with the same libraries for at least a week without having a single compilation problem during that time. The two libraries are just composed of a bunch of classes, and when I removed them from my project I got the same issue. Since I have never created libraries myself, I have no idea how I can find wether the ones I'm using are compatible with 64 bit (?) I also tried the following changes for architectures under the target panel :
- 将$（ARCHS_STANDARD_INCLUDING_64_BIT）添加到架构
- 仅构建活动架构 - >设置为'NO'
- 代表'有效架构' - >设置为arm64，armv7和armv7s
- 删除DerivedData文件夹及其内容，再次清理和构建
- added $(ARCHS_STANDARD_INCLUDING_64_BIT) to the Architectures
- build active architecture only -> set to 'NO'
- for 'valid architectures' -> set to arm64, armv7 and armv7s
- deleted the DerivedData folder and its contents, cleaned and built again
但这些变化都不起作用。请问有人对此有所了解吗？
谢谢
But none of these changes work. Please, does someone have a clue on this? Thanks
推荐答案
显然，您的班级格式涉及问题。检查你的这个类的声明，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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