我用的Xcode8.1，同伴用的Xcode7.3.1，其上传了几个XIB文件，导致我这边项目一直爆红，爆红信息：“UIStackView before iOS9.0”。如图：
网上海搜了一番，找到解决办法，现贴图如下：
将“Interface Builder Document”里的“Builds For”更改为“ iOS9.0 and Later”即可.
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