何时调用addChildViewController

时间:2012-12-07 17:56:28

标签: ios

我正在尝试使用类似于UINavigationController的东西,以便我可以自定义动画。首先,我只是使用Apple股票动画。这是我的containerViewController:

- (void)loadView {
    // Set up content view
    CGRect frame = [[UIScreen mainScreen] bounds];
    _containerView = [[UIView alloc] initWithFrame:frame];
    _containerView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    self.view = _containerView;

}

- (id)initWithInitialViewController:(UIViewController *)vc {
    self = [super init];
    if (self) {
        _currentViewController = vc;

        [self addChildViewController:_currentViewController];
        [self.view addSubview:_currentViewController.view];
        [self didMoveToParentViewController:self];

        _subViewControllers = [[NSMutableArray alloc] initWithObjects:_currentViewController, nil];
    }
    return self;
}



- (void)pushChildViewController:(UIViewController *)vc animation:(UIViewAnimationOptions)animation {
    vc.view.frame = _containerView.frame;
    [self addChildViewController:vc];

    [self transitionFromViewController:_currentViewController toViewController:vc duration:0.3 options:animation animations:^{

    }completion:^(BOOL finished) {
        [self.view addSubview:vc.view];
        [vc didMoveToParentViewController:self];
        [self.subViewControllers addObject:vc];
    }];
}

- (void)popChildViewController:(UIViewController *)vc WithAnimation:(UIViewAnimationOptions)animation {
    // Check that there is a view controller to pop to
    if ([self.subViewControllers count] <= 0) {
        return;
    }

    NSInteger idx = [self.subViewControllers count] - 1;
    UIViewController *toViewController = [_subViewControllers objectAtIndex:idx];
    [vc willMoveToParentViewController:nil];

    [self transitionFromViewController:vc toViewController:toViewController duration:0.3 options:animation animations:^{

    }completion:^(BOOL finished) {
        [vc.view removeFromSuperview];
        [vc removeFromParentViewController];
        [self didMoveToParentViewController:toViewController];
        [self.subViewControllers removeObjectAtIndex:idx];
    }];
}

我有这个ContainerViewcontroller作为窗口的rootViewController。我可以添加我的初始viewController并推送一个视图控制器。当我尝试弹出时,我得到了

ContainerViewController[65240:c07] Unbalanced calls to begin/end appearance transitions for <SecondViewController: 0x8072130>.

我想知道我做错了什么。我想我的initialViewController仍然在secondViewController下面。有什么想法吗?谢谢!

3 个答案:

答案 0 :(得分:4)

我不知道这是不是导致你的问题,但不应该这样:

[self didMoveToParentViewController:toViewController];

是:

[toViewController didMoveToParentViewController:self];

另外,我不确定你在使用subViewControllers数组做什么。它似乎是childViewControllers数组的重复,它已经是UIViewController的属性。

另一件事我不确定是对的。在你的pop方法中,你的toViewController是_subViewControllers数组中的最后一个控制器。难道你不希望它成为倒数第二的人吗?难道不应该是最后一个你正在弹出的人吗?你正在弹出vc,这是你传入方法的控制器,我不明白。

这就是我制作像控制器这样的导航的方式。在其包含行为中,它的作用类似于导航控制器,但没有导航栏,并允许不同的过渡动画:

@implementation ViewController

-(id)initWithRootViewController:(UIViewController *) rootVC {
    if (self = [super init]) {
        [self addChildViewController:rootVC];
        rootVC.view.frame = self.view.bounds;
        [self.view addSubview:rootVC.view];
    }
    return self;
}


-(void)pushViewController:(UIViewController *) vc animation:(UIViewAnimationOptions)animation {
    vc.view.frame = self.view.bounds;
    [self addChildViewController:vc];
    [self transitionFromViewController:self.childViewControllers[self.childViewControllers.count -2] toViewController:vc duration:1 options:animation animations:nil
            completion:^(BOOL finished) {
            [vc didMoveToParentViewController:self];
            NSLog(@"%@",self.childViewControllers);
    }];
}

-(void)popViewControllerAnimation:(UIViewAnimationOptions)animation {
    [self transitionFromViewController:self.childViewControllers.lastObject toViewController:self.childViewControllers[self.childViewControllers.count -2] duration:1 options:animation animations:nil
                            completion:^(BOOL finished) {
                                [self.childViewControllers.lastObject removeFromParentViewController];
                                NSLog(@"%@",self.childViewControllers);
                            }];
}

-(void)popToRootControllerAnimation:(UIViewAnimationOptions)animation {
    [self transitionFromViewController:self.childViewControllers.lastObject toViewController:self.childViewControllers[0] duration:1 options:animation animations:nil
                            completion:^(BOOL finished) {
                                for (int i = self.childViewControllers.count -1; i>0; i--) {
                                    [self.childViewControllers[i] removeFromParentViewController];
                                }
                                NSLog(@"%@",self.childViewControllers);
                            }];
}

编辑后:通过向IB中的所有控制器添加导航栏(包括自定义容器控制器中的控制器),我可以使用此控制器复制后退按钮功能。我为任何将要推送的控制器添加了一个条形按钮,并将它们的标题设置为nil(如果我将标题保留为“item”,我会遇到一些故障)。删除该标题会使按钮消失(在IB中),但您仍可以在场景列表中与其建立连接。我在其中添加了一个IBOutlet,并添加了此代码以获得我想要的功能:

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    if (self.isMovingToParentViewController) {
        self.backButton.title = [self.parentViewController.childViewControllers[self.parentViewController.childViewControllers.count -2] navigationItem].title;
    }else{
        self.backButton.title = [self.parentViewController.childViewControllers[self.parentViewController.childViewControllers.count -3] title];
    }
}

我已经展示了两种不同的方式来访问标题 - 在IB中你可以设置我在else子句中使用的控制器的标题,或者你可以像在if部分中那样使用navigationItem标题该条款。 else子句中的“-3”是必需的,因为在调用viewWillAppear时,正在弹出的控制器仍在childViewControllers数组中。

答案 1 :(得分:4)

应首先调用

addChildViewController

对于添加/删除,您可以参考这个伟大的类别,不用担心何时调用它:

UIViewController + Container

- (void)containerAddChildViewController:(UIViewController *)childViewController {

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

}

- (void)containerRemoveChildViewController:(UIViewController *)childViewController {

    [childViewController willMoveToParentViewController:nil];
    [childViewController.view removeFromSuperview];
    [childViewController removeFromParentViewController];

}

答案 2 :(得分:3)

除了rdelmar的答案,你不应该从文档中调用addView / removeFromSuperview transitionFromViewController为你做这个:

  

此方法将第二个视图控制器的视图添加到视图中   层次结构,然后执行动画中定义的动画   块。动画完成后,它会删除第一个视图   视图层次结构中的控制器视图。