我需要一个根视图控制器实例。
我尝试了这些方法:
UIViewController *rootViewController = (UIViewController*)[[[UIApplication sharedApplication] keyWindow] rootViewController];
返回: null :
另外,当我尝试获取控制器数组时:
NSArray *viewControllers = self.navigationController.viewControllers;
它仅返回一个控制器,但不是我的根视图控制器。
如果我尝试从导航控制器中获取:
UIViewController *root = (UIViewController*)[self.navigationController.viewControllers objectAtIndex:0];
有什么想法吗?我还能尝试获得根视图控制器的一个实例吗?
谢谢。
如果您尝试访问rootViewController在appDelegate中设置的。试试这个:
rootViewController
目标C
YourViewController *rootController = (YourViewController*)[[(YourAppDelegate*) [[UIApplication sharedApplication]delegate] window] rootViewController];
迅速
let appDelegate = UIApplication.sharedApplication().delegate as AppDelegate let viewController = appDelegate.window!.rootViewController as YourViewController
迅捷3
let appDelegate = UIApplication.shared.delegate as! AppDelegate let viewController = appDelegate.window!.rootViewController as! YourViewController
迅捷4和4.2
let viewController = UIApplication.shared.keyWindow!.rootViewController as! YourViewController
雨燕5&5.1&5.2
let viewController = UIApplication.shared.windows.first!.rootViewController as! YourViewController