I managed to solve this problem in my iPad App through the following steps:
- Checking the Build Phases
- Editing the Info.plist file to add the option "Main storyboard file base name (iPad)"
Just like in this picture: 
本文介绍了解决iPad应用程序中遇到的问题的方法。主要步骤包括检查构建阶段并编辑Info.plist文件以添加Mainstoryboardfilebasename(iPad)选项。
I managed to solve this problem in my iPad App through the following steps:
Just like in this picture: 

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