建立Empty Application，新建Storyboard并添加View Controller 控件后运行为空白，并报错...

建立Empty Application，新建Storyboard并添加View Controller 控件后运行为空白，并报错 控制台显示： 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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