Compiling IB documents for earlier than iOS 7 is no longer supported

【Compiling IB documents for earlier than iOS 7 is no longer supported】升级到Xcode Xib报错问题的解决
在升级到Xcode9 遇到以下错误:Compiling IB documents for earlier than iOS 7 is no longer supported
Compiling IB documents for earlier than iOS 7 is no longer supported
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将Builds for 选项设置为iOS10 以后就OK了。

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