错误现象: XCODE 6.1 在使用storyboard时,报错:Failed to instantiate the default view controller for UIMainStoryboardFile 'MainStoryboard' - perhaps the designated entry point is not set?
原因分析:在StoryBoard中没有一个view controller设置了Initial Scene。
解决方案:在Storyboard中,选择一个view conroller作为story board的第一启动界面