获取当前viewController

本文主要是介绍获取当前viewController，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

类方法：

// 获取当前显示的 viewController
+ (UIViewController*)topViewController {return [self topViewControllerWithRootViewController:[UIApplication sharedApplication].keyWindow.rootViewController];
}
+ (UIViewController*)topViewControllerWithRootViewController:(UIViewController*)rootViewController {if ([rootViewController isKindOfClass:[UITabBarController class]]) {UITabBarController* tabBarController = (UITabBarController*)rootViewController;return [self topViewControllerWithRootViewController:tabBarController.selectedViewController];} else if ([rootViewController isKindOfClass:[UINavigationController class]]) {UINavigationController* navigationController = (UINavigationController*)rootViewController;return [self topViewControllerWithRootViewController:navigationController.visibleViewController];} else if (rootViewController.presentedViewController) {UIViewController* presentedViewController = rootViewController.presentedViewController;return [self topViewControllerWithRootViewController:presentedViewController];}else {return rootViewController;}
}

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