一句话解决的事儿

[Application] The app delegate must implement the window property if it wants to use a main storyboard file.

低于iOS13的设备，安装新Xcode11创建的应用时，出现这个提醒，是因为增加了UISceneDelegate的缘故，解决办法是在AppDelegate.m中增加一行 

@synthesize window;

标签：Xcode11,一句,app,synthesize,Application,window,file,解决,事儿
来源： https://www.cnblogs.com/yuxiaoyiyou/p/12874715.html