出错file is universal (3 slices) but does not contain a(n) armv7s slice

错误详细信息：
ld: file is universal (3 slices) but does not contain a(n) armv7s slice: /mac/XXX/XXX/libs/libxxx.a for architecture armv7s

clang: error: linker command failed with exit code 1 (use -v to see invocation)

解决方法如下：

1.升级涉及到的.a文件
2.在target的Build Settings里面，将Build Active Architecture Only改成YES
3.在target的Build Settings里面，找到Valid Architectures，删除其中的armv7s