iOS arm64 armv7报错

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1：Undefined symbols for architecture arm64:

Undefined symbols for architecture arm64: "OBJC_CLASS$_FBSession", referenced from: someFileld: symbol(s) not found for architecture arm64

解决：
project -> target (your project name) -> build settings and change architectures to standard architectures (armv7, armv7s), and valid architectures to armv7, armv7s.

参考

2：No architectures to compile for (ARCHS=arm6 arm7, VALID_ARCHS=armv7)
解决：

Go toProject Target > Build Settings > Architectures
Delete whatever you see there, and then add these rows one by one:
armv6 armv7
There are no 'save' buttons there, so what I do, is adding another blank row, pressing enter, removing it, and then clicking out somewhere else, so that I make sure I have both of them added:

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Now go to the AppName-Info.plist file, and look for the key "Require device capabilities" and delete it all.

参考