iphone - 如何在页面视图控制器中获取当前视图控制器

Question

我想在页面视图控制器中获取当前的视图控制器。如何做到这一点。它是否有一些代表要打电话或什么。

Answer 1

我只是有同样的问题。在您更改页面后，当前控制器看起来是列表中的最后一个。这对我有用，但我不知道它是否总是正确的。

- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed
{
    UIViewController *vc = [pageViewController.viewControllers lastObject];
}

Answer 2

尝试在pageViewController.viewControllers中获取第一个视图控制器

    if let vc = pageViewController.viewControllers?[0] {
        ... vc is current controller...
    }

如果要处理页面更改，请在委托方法中进行：

func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
    if let vc = pageViewController.viewControllers?[0] {
        ... vc is current controller...
    }
}

Answer 3

if you are in any UIView class (as UIButton, UITable or any other subclass) that is a subView of the UIViewController.view (or of any subView.subView.subView... of it)

you can check if there's a UIViewController in the superVew(s) chain, and stop when you find a UIViewController

something like this:

UIViewController* controllerFound = nil;
for (UIView* next = [self superview]; next; next = next.superview) {
    UIResponder* nextResponder = [next nextResponder];
    if ([nextResponder isKindOfClass:[UIViewController class]]) {
        controllerFound = (UIViewController*)nextResponder;
    }
}