1.从跟控制器开始找起;
2.然后找UITabBarController
3.然后找UINavigationController
4.vc = ((UINavigationController*)vc).visibleViewController;
@property(nullable, nonatomic,readonly,strong) UIViewController *visibleViewController; // Return modal view controller if it exists. Otherwise the top view controller.即:只要存在模态控制器,就返回模态控制器,否则就返回顶部控制器;
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