Application windows are expected to have a root view controller at the end of application launch(示例代 _Application

一年好景君须记，最是橙黄橘绿时。这篇文章主要讲述Application windows are expected to have a root view controller at the end of application launch(示例代相关的知识，希望能为你提供帮助。
【Application windows are expected to have a root view controller at the end of application launch(示例代】今天把Xcode升级了，模拟器用的12.1的系统，运行时发现项目总是崩溃，采用9.3系统的测试机发现错误日志如下：
Application windows are expected to have a root view controller at the end of application launch

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解决办法如下：

self.window = [[UIWindow alloc]initWithFrame:SCREEN_RECT]; self.window.backgroundColor = [UIColor whiteColor]; self.window.rootViewController = [[UIViewController alloc]init]; [self.window makeKeyAndVisible];