ios - UIViewController 包含崩溃

Question

我正在摆弄一些代码来尝试让 UIViewController 包含工作(在 iPad 应用程序中)。

场景如下:我有一个 View ，我想在其上显示第二个 View 。我想让第二个(不同的)UIViewController 管理与第二个 View 的所有交互。第一个 View 将在按下按钮时加载第二个 View 。当按下按钮时，以下代码在第一个 Controller 中运行:

-(void)displayPropertyView // <-button triggers this
{
    // Need to instantiate a new view and add it to the main editor view.
    HPSQuestionListController* questionListController = [ [ HPSQuestionListController alloc ] init ];
    [self.view addSubview:questionListController.view];
    [self.view bringSubviewToFront:questionListController.view];
    [self pushViewController:questionListController animated:YES];

}
-(void)pushViewController:(UIViewController*)controller animated:(BOOL)animated
{
    [self addChildViewController:controller];
    //[controller didMoveToParentViewController:self];

    if (YES)
    {
        [self transitionFromViewController:self 
                          toViewController:controller 
                                  duration:1.0 
                                   options:nil 
                                animations:^{}
                                completion:^(BOOL finished){
            [controller didMoveToParentViewController:self];
        }];
    }
} 

应用程序在 transitionFromViewController 行崩溃:

Children view controllers and must have a common parent view controller when calling -[UIViewController transitionFromViewController:toViewController:duration:options:animations:completion:]'

有人知道怎么解决吗？我对 UIViewController 包含的理解是我可以让两个 Controller 同时管理两个 View 。这是错误的吗？

Answer 1

subview Controller 应该有相同的父容器 View Controller (这就是错误消息所说的)。要添加 subview Controller ，请在容器 View Controller 中使用此代码:

[self addChildViewController:myVC1];
[myVC1 didMoveToparentViewController:self];

在容器 View Controller 中你可以使用transitionFromViewController

[self transitionFromViewController:myVC1 toViewController:myVC2 duration:2.0f options:UIViewAnimationOptionTransitionCrossDissolve animations:^{} completion:^(BOOL finished) {
  [myVC1 removeFromParentViewController];
  [myVC2 didMoveToParentViewController:self];
}];

您正在尝试做一些没有多大意义的事情，self 不是您代码中的容器 View Controller 。

有关完整示例，请参阅:https://github.com/toolmanGitHub/stackedViewControllers