Failed to instantiate the default view controller...

Log:

 Failed to instantiate the default view controller for UIMainStoryboardFile 'MainStoryboard' - perhaps the designated entry point is not set?

原因 :StoryBoard 中没有一个 view controller 作为入口

在 Storyboard 中,选择一个 view conroller,将 "Is Initial View Controller" 属性勾上,作为 story board 的第一启动界面

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