ios - UIViewControllers 中的 UIViewController

Question

我有一个 UIViewController，里面有 UITabBar。我正在尝试模仿 UITabBarController。

My question is how do I set or a UIViewController whenever a TabBarItem is selected?

我对如何将 UIViewController 放入我的 UIViewController 中试图模仿 UITabBarController 感到困惑。

请不要让我使用 UITabBarController

Answer 1

您可以使用 subview Controller 将 View Controller 嵌入到其他 View Controller 中，只需从您的 View Controller 中调用它:

YourViewController *childViewController = [[YourViewController alloc] init];

UIView *containerView = //some view in your view hierarchy
childViewController.view.frame = containerView.bounds;

[self addChildViewController: childViewController];
[containerView addSubview:childViewController.view];
[childViewController didMoveToParentViewController:self];

如果你想在 subview Controller 之间进行分页，你可以使用 UIPageViewController 作为根 subview Controller ，或者从 apple documentation: 中借用这段代码。

- (void) cycleFromViewController: (UIViewController*) oldC
        toViewController: (UIViewController*) newC {

[oldC willMoveToParentViewController:nil];                        // 1
[self addChildViewController:newC];

newC.view.frame = [self newViewStartFrame];                       // 2
CGRect endFrame = [self oldViewEndFrame];

[self transitionFromViewController: oldC toViewController: newC   // 3
      duration: 0.25 options:0
      animations:^{
         newC.view.frame = oldC.view.frame;                       // 4
         oldC.view.frame = endFrame;
       }
       completion:^(BOOL finished) {
         [oldC removeFromParentViewController];                   // 5
         [newC didMoveToParentViewController:self];
        }];
}