降级到 Xcode12.1 之后，可能会存在如下问题，有趣味的同学能够尝试一下！
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1: objc_msgsend too many arguments to function call expected 0 have 3
解决办法:
Project -> Clear Builder Folder- 而后 设置
Enable Strict Checking of objc_msgSend Calls为NO - 敞开 XCode 从新关上
2: missing one or more architectures required by this target: arm64
Xcode12 build error. The linked framework ‘Pods_projectA.framework’is missing one or more architectures required by this target: arm64
解决办法: Project -> Build Settings -> Excluded Architecture -> Debug -> Any iOS Simulator SDK 增加arm64
3：xxx.h 文件 找不到
解决办法: 在Header Search Path -> Debug 中增加对应搜寻目录
4: No architectures to compile for (ONLY_ACTIVE_ARCH=YES, active arch=x86_64, VALID_ARCHS=arm64 armv7 armv7s).
解决办法: Project -> Build Settings -> Build Active Architecture Only -> Debug 设置为NO
5: Command PhaseScriptExecution failed with a nonzero exit code
问题起因: 请见这里
解决办法 1: 删除 User-Defined 上面的 VALID_ARCHS设置，设置 Excluded Architecture 下 [Any iOS Simjulator]为 arm64
解决办法 2: 在 User-Defined 上面的 VALID_ARCHS设置，Debug 为 arm64 armv7 armv7s x86_64新增 x86_64机型。