通过self.view获得顶端的ViewController

置顶小小斌-Jone

于 2015-09-07 18:07:02 发布

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分类专栏：移动开发 IOS 文章标签： uiviewcontroller uiview

本文链接：https://blog.youkuaiyun.com/nizenyang/article/details/48269715

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这篇博客介绍了如何通过`self.view`来获取当前视图控制器的顶端ViewController。内容详细说明了一个简单的Objective-C方法：`UIViewController *ViewController = [self.view containingViewController];` 这个方法可以帮助开发者在代码中便捷地获取到顶部的UIViewController实例。

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- (UIViewController *) containingViewController {
    UIView * target = self.superview ? self.superview : self;
    return (UIViewController *)[target traverseResponderChainForUIViewController];
}

- (id) traverseResponderChainForUIViewController {
    id nextResponder = [self nextResponder];
    BOOL isViewController = [nextResponder isKindOfClass:[UIViewController class]];
    BOOL isTabBarController = [nextResponder isKindOfClass:[UITabBarController class]];
    if (isViewController && !isTabBarController) {
        return nextResponder;
    } else if(isTabBarController){
        UITabBarController *tabBarController = nextResponder;
        return [tabBarController selectedViewController];
    } else if ([nextResponder isKindOfClass:[UIView class]]) {
        return [nextResponder traverseResponderChainForUIViewController];
    } else {
        return nil;
    }
}