建立Empty Application，新建Storyboard並添加View Controller 控件後運行爲空白，並報錯...

建立Empty Application，新建Storyboard並添加View Controller 控件後運行爲空白，並報錯 控制檯顯示： 2012-07-18 15:21:57.338 apress-8[664:f803] Application windows are expected to have a root view controller at the end of applicat

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