寻找最上层的控制器或者nextResponder

作者: 守护地中海的花 | 来源:发表于2021-07-03 19:10 被阅读0次

上代码

- (UIViewController *)findCurrentViewController {
    UIWindow *window = [[UIApplication sharedApplication].delegate window];
    UIViewController *topViewController = [window rootViewController];
    while (true) {
        if (topViewController.presentedViewController) {
            topViewController = topViewController.presentedViewController;
        } else if ([topViewController isKindOfClass:[UINavigationController class]] && [(UINavigationController*)topViewController topViewController]) {
            topViewController = [(UINavigationController *)topViewController topViewController];
        } else if ([topViewController isKindOfClass:[UITabBarController class]]) {
            UITabBarController *tab = (UITabBarController *)topViewController;
            topViewController = tab.selectedViewController;
        } else {
            break;
        }
    }
    return topViewController;
}
// 发现当前view的Controller

- (UIViewController *)findSuperViewController:(UIView *)view
{
    UIResponder *responder = view;
    // 循环获取下一个响应者,直到响应者是一个UIViewController类的一个对象为止,然后返回该对象.
    while ((responder = [responder nextResponder])) {
        if ([responder isKindOfClass:[UIViewController class]]) {
            return (UIViewController *)responder;
        }
    }
    return nil;
}

下面可以不看☺️

presentedViewController: 是否还有present出去的控制器

场景就是从HomePageController的一个按钮点击过去的
homePage 是导航控制器管理的导航控制器是由Tabbar控制器的
模拟场景：homePageController 点击跳转BBBBViewController 然后点击BBBBViewController空白处跳转CCCViewController

从homePageController 点击按钮 present 出BBBBViewController 打印

------ UIViewController+DTCategory.m ------ 28 行 ------ <TabBarController: 0x107872c00> (null)
------ UIViewController+DTCategory.m ------ 28 行 ------ <DTBaseNavigationController: 0x107899200> (null)
------ UIViewController+DTCategory.m ------ 28 行 ------ <HomePageController: 0x107897a00> (null)
------ HomePageNaviView.m ------ 46 行 ------ 最终：<HomePageController: 0x107897a00>

跳转BBBBViewController 后打印

------ UIViewController+DTCategory.m ------ 28 行 ------ <TabBarController: 0x107872c00> <BBBBViewController: 0x1077f2ce0>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x1077f2ce0> (null)
------ HomePageNaviView.m ------ 49 行 ------ 最终：<BBBBViewController: 0x1077f2ce0>

虽然是HomePageController present 但是寻找控制器的时候 TabBarController 就找到了BBBBViewController

跳转BBBBViewController 然后点击CCCViewController 空白处打印

------ UIViewController+DTCategory.m ------ 28 行 ------ <TabBarController: 0x107872c00> <BBBBViewController: 0x1077f2ce0>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x1077f2ce0> <CCCViewController: 0x10758f230>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x10758f230> (null)

重复打印就是如此

------ BBBBViewController.m ------ 24 行 ------ touchesBegan BBBB
------ UIViewController+DTCategory.m ------ 28 行 ------ <TabBarController: 0x107872c00> <BBBBViewController: 0x1077f2ce0>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x1077f2ce0> <CCCViewController: 0x10758f230>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x10758f230> <BBBBViewController: 0x1077f0610>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x1077f0610> (null)
------ CCCViewController.m ------ 24 行 ------ touchesBegan cccc
------ UIViewController+DTCategory.m ------ 28 行 ------ <TabBarController: 0x107872c00> <BBBBViewController: 0x1077f2ce0>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x1077f2ce0> <CCCViewController: 0x10758f230>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x10758f230> <BBBBViewController: 0x1077f0610>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x1077f0610> <CCCViewController: 0x114f0d710>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x114f0d710> (null)
------ BBBBViewController.m ------ 24 行 ------ touchesBegan BBBB
------ UIViewController+DTCategory.m ------ 28 行 ------ <TabBarController: 0x107872c00> <BBBBViewController: 0x1077f2ce0>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x1077f2ce0> <CCCViewController: 0x10758f230>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x10758f230> <BBBBViewController: 0x1077f0610>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x1077f0610> <CCCViewController: 0x114f0d710>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x114f0d710> <BBBBViewController: 0x114d16a20>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x114d16a20> (null)
------ CCCViewController.m ------ 24 行 ------ touchesBegan cccc
------ UIViewController+DTCategory.m ------ 28 行 ------ <TabBarController: 0x107872c00> <BBBBViewController: 0x1077f2ce0>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x1077f2ce0> <CCCViewController: 0x10758f230>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x10758f230> <BBBBViewController: 0x1077f0610>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x1077f0610> <CCCViewController: 0x114f0d710>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x114f0d710> <BBBBViewController: 0x114d16a20>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x114d16a20> <CCCViewController: 0x10775faa0>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x10775faa0> (null)
------ BBBBViewController.m ------ 24 行 ------ touchesBegan BBBB
------ UIViewController+DTCategory.m ------ 28 行 ------ <TabBarController: 0x107872c00> <BBBBViewController: 0x1077f2ce0>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x1077f2ce0> <CCCViewController: 0x10758f230>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x10758f230> <BBBBViewController: 0x1077f0610>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x1077f0610> <CCCViewController: 0x114f0d710>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x114f0d710> <BBBBViewController: 0x114d16a20>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x114d16a20> <CCCViewController: 0x10775faa0>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x10775faa0> <BBBBViewController: 0x107549a40>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x107549a40> (null)
------ CCCViewController.m ------ 24 行 ------ touchesBegan cccc
------ UIViewController+DTCategory.m ------ 28 行 ------ <TabBarController: 0x107872c00> <BBBBViewController: 0x1077f2ce0>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x1077f2ce0> <CCCViewController: 0x10758f230>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x10758f230> <BBBBViewController: 0x1077f0610>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x1077f0610> <CCCViewController: 0x114f0d710>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x114f0d710> <BBBBViewController: 0x114d16a20>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x114d16a20> <CCCViewController: 0x10775faa0>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x10775faa0> <BBBBViewController: 0x107549a40>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x107549a40> <CCCViewController: 0x107580940>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x107580940> (null)
------ BBBBViewController.m ------ 24 行 ------ touchesBegan BBBB
------ UIViewController+DTCategory.m ------ 28 行 ------ <TabBarController: 0x107872c00> <BBBBViewController: 0x1077f2ce0>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x1077f2ce0> <CCCViewController: 0x10758f230>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x10758f230> <BBBBViewController: 0x1077f0610>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x1077f0610> <CCCViewController: 0x114f0d710>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x114f0d710> <BBBBViewController: 0x114d16a20>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x114d16a20> <CCCViewController: 0x10775faa0>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x10775faa0> <BBBBViewController: 0x107549a40>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x107549a40> <CCCViewController: 0x107580940>
------ UIViewController+DTCategory.m ------ 28 行 ------ <CCCViewController: 0x107580940> <BBBBViewController: 0x10753e2e0>
------ UIViewController+DTCategory.m ------ 28 行 ------ <BBBBViewController: 0x10753e2e0> (null)

下面是我之前写的没有考虑先判断presentedViewController

+ (UIViewController *)topViewController
{
    return [self topVCWithRootVC:self.keyWindow.rootViewController];
}

+ (UIViewController *)topVCWithRootVC:(UIViewController *)rootVC
{
    NSLog(@"%@ %@",rootVC,rootVC.presentedViewController);
    if ([rootVC isKindOfClass:[UITabBarController class]])
    {
        UITabBarController *tabBarController = (UITabBarController *)rootVC;
        return [self topVCWithRootVC:tabBarController.selectedViewController];
    }
    else if ([rootVC isKindOfClass:[UINavigationController class]])
    {
        UINavigationController *navigationController = (UINavigationController *)rootVC;
        return [self topVCWithRootVC:navigationController.visibleViewController];
    }
    else if (rootVC.presentedViewController)
    {
        UIViewController *presentedViewController = rootVC.presentedViewController;
        return [self topVCWithRootVC:presentedViewController];
    }
    else
    {
        return rootVC;
    }
}

打印一波

------ UIApplication+Extension.m ------ 36 行 ------ <TabBarController: 0x112095a00> (null)
------ UIApplication+Extension.m ------ 36 行 ------ <DTBaseNavigationController: 0x112096800> (null)
------ UIApplication+Extension.m ------ 36 行 ------ <HomePageController: 0x112087000> (null)
------ HomePageNaviView.m ------ 47 行 ------ 最终：<HomePageController: 0x112087000>
------ UIApplication+Extension.m ------ 36 行 ------ <TabBarController: 0x112095a00> (null)
------ UIApplication+Extension.m ------ 36 行 ------ <DTBaseNavigationController: 0x112096800> (null)
------ UIApplication+Extension.m ------ 36 行 ------ <HomePageController: 0x112087000> (null)
------ HomePageNaviView.m ------ 49 行 ------ 111111111
------ UIApplication+Extension.m ------ 36 行 ------ <TabBarController: 0x112095a00> <BBBBViewController: 0x111d4ad60>
------ UIApplication+Extension.m ------ 36 行 ------ <DTBaseNavigationController: 0x112096800> <BBBBViewController: 0x111d4ad60>
------ UIApplication+Extension.m ------ 36 行 ------ <BBBBViewController: 0x111d4ad60> (null)
------ HomePageNaviView.m ------ 50 行 ------ 最终：<BBBBViewController: 0x111d4ad60>

打印nextResponder

如果view就是keywindow 打印的结果是
UIApplication、AppDelegate


如果view 是一个普通view 在控制器上 则是
xxxController 然后控制器的nextResponder 就是null

寻找最上层的控制器或者nextResponder

下面可以不看☺️

虽然是HomePageController present 但是寻找控制器的时候 TabBarController 就找到了BBBBViewController

下面是我之前写的没有考虑先判断presentedViewController

打印nextResponder

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深度阅读

栏目导航

热点阅读

寻找最上层的控制器或者nextResponder

下面可以不看☺️

虽然是HomePageController present 但是寻找控制器的时候 TabBarController 就找到了BBBBViewController

下面是我之前写的 没有考虑先判断presentedViewController

打印nextResponder

相关文章

网友评论

延伸阅读

深度阅读

栏目导航

热点阅读

下面是我之前写的没有考虑先判断presentedViewController