Failed to instantiate the default view controller for UIMainStoryboardFile 'Main'

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

IOS 工程编译的时候上述错误的解决办法：

1.在Main.storyboard 的viewcontroller中选中一个并设置“Is Initial View Controller”为选中状态，如图：

2.如果编译还有错误，那就尝试修改程序的EntryPoint,由Main.StoryBoard 修改为LaunchScreen.xib。如下图：

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