IOS OC 在新建的window中添加一个controller

1. 在AppDelegate.m文件中找到application:didFinishLaunchingWithOptions:方法。
2. 创建一个新的UIWindow对象：UIWindow *newWindow = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
3. 创建一个新的ViewController对象：UIViewController *newController = [[UIViewController alloc] init];
4. 将该ViewController设置为newWindow的根视图控制器：newWindow.rootViewController = newController;
5. 显示newWindow：[newWindow makeKeyAndVisible];

完整代码示例：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // 创建新的window
    UIWindow *newWindow = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    // 创建新的ViewController
    UIViewController *newController = [[UIViewController alloc] init];
    // 将ViewController设置为newWindow的根视图控制器
    newWindow.rootViewController = newController;
    // 显示newWindow
    [newWindow makeKeyAndVisible];
    return YES;
}