自定义控件里如何拿到导航控制器进行页面跳转？

(1)如果有UITabBarController我们会这样获取导航控制器:


UIViewController *viewC = [[UIViewController alloc]init];

// 取出当前的导航控制器

UITabBarController *tabBarVc = (UITabBarController *)[UIApplication sharedApplication].keyWindow.rootViewController;

//The view controller associated with the currently selected tab item

//当前选择的导航控制器

UINavigationController *navC = (UINavigationController *)tabBarVc.selectedViewController;

[navC pushViewController:viewC animated:YES];

(2)如果通过modal出来的控制器并且用UITabBarController不好使, 我们会这样获取导航控制器:

UIViewController *viewC = [[UIViewController alloc]init];

//获取最终的根控制器

UIViewController *rootC = [UIApplication sharedApplication].keyWindow.rootViewController;

//如果是modal出来的控制器,它就会通过presentedViewController拿到上一个控制器

UINavigationController *navC = (UINavigationController *)rootC.presentedViewController;

[navC pushViewController:viewC animated:YES];