从窗口层次结构中删除导航或选项卡栏控制器 [英] Remove navigation or tab bar controller from window hierarchy

问题描述

在某些时候，我需要一个tabBar控制器而不是一个导航控制器.为此，我释放了导航控制器，并在窗口中添加了标签栏.

At some point I need a tabBar controller instead of a navigation controller. To achieve this I have released the navigation controller and added a tab bar to the window.

UINavigationcontroller是否已从窗口层次结构中删除?

Is the UINavigationcontroller removed from the window hierarchy?

推荐答案

我了解您想从导航控制器切换到TabBar控制器，然后再返回，但是您担心一旦删除，您将无法拿回来.

I understand that you want to switch from the navitation controller to a TabBar controller and back, but you are concerned that once removed, you won't be able to get it back.

显而易见的解决方案不是删除它们，而是隐藏它们.以下是TabBar控制器的示例，它仅将y点的动画从431设置为480，以使其不可见并返回.

The obvious solution is not to remove them, but to hide them. The following is a sample for the TabBar controller, it simply animates the y point from 431 to 480 so it gets out of view and back.

- (void) hidetabbar:(BOOL)hiddenTabBar {
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.5];
    for(UIView *view in self.uiTabBarController.view.subviews){
        if([view isKindOfClass:[UITabBar class]]) {
            if (hiddenTabBar) {
                [view setFrame:CGRectMake(view.frame.origin.x, 431, view.frame.size.width, view.frame.size.height)];
            } else {
                [view setFrame:CGRectMake(view.frame.origin.x, 480, view.frame.size.width, view.frame.size.height)];
            }
        } else {
            if (hiddenTabBar) {
                [view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, 431)];
            } else {
                [view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, 480)];
            }
        }
    }
    [UIView commitAnimations];  
}

您可以对导航控制器执行完全相同的操作.

You can do exactly the same for the navigation controller.

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