错误信息：---perhaps-the-designated-entry-point-is-not-set

现象描述：
更换Storyboard后没有指定初始化控制器，导致应用启动后黑屏。

详细错误信息：
2016-09-07 09:11:39.378 UsingData[11899:331553] Failed to instantiate the default view controller for UIMainStoryboardFile 'App' - perhaps the designated entry point is not set?

解决方法：
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