執(zhí)行到“[_window makeKeyAndVisible];”語句的時候報錯了，怎么辦呀？？？
錯誤描述如下：
Application windows are expected to have a root view controller at the end of application launch
SilentAria
2015-09-27
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2015-10-15
http://stackoverflow.com/questions/14835784/xcode-application-windows-are-expected-to-have-a-root-view-controller-at-the-en可以看看這個