Framework not found IOSurface for architecture arm64

使用xcode9编译工程后,再切换到xcode8时偶尔会出现这个问题,
将xcode9 Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/System/Library/Frameworks/
路径下的FileProvider.framework 和 IOSurface.framework复制到xcode8对应的目录下,再clean编译

https://stackoverflow.com/questions/44450673/framework-not-found-iosurface-for-architecture-arm64

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