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
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];