XCode11中The app delegate must implement the window property if it wants to use 如何解決

用XCode11新建一個工程支持的最小iOS版本小於iOS13的話，XCode控制檯會爆出[Application] The app delegate must implement the window property if it wants to use a main storyboard file.的提示。只需要兩步就可以解決問題， 1.添加window屬性 @property (nonat

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