导航控制器中的后退按钮动画

Question

CATransitions 可用于在向下钻取时为导航控制器中的过渡设置动画。但是，当使用后退按钮和导航控制器（返回）时，动画仍然滑出。有谁知道如何将 CATransition 附加到导航控制器的后退按钮？谢谢。

“向下钻取”时用于动画的代码：

CATransition *transition = [CATransition animation];
transition.duration = 1;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionPush;
transition.subtype = kCATransitionFromTop;
transition.delegate = self;
[self.navigationController.view.layer addAnimation:transition forKey:nil];

Answer 1

不需要创建自定义按钮...您可以简单地执行以下操作：

- (void)viewWillDisappear:(BOOL)animated
{
    if ([self.navigationController.viewControllers indexOfObject:self]==NSNotFound) {
        // back button was pressed.  We know this is true because self is no longer
        // in the navigation stack.  
        CATransition *transition = [CATransition animation];
        [transition setDuration:0.75];
        [transition setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
        [transition setType:@"oglFlip"];
        [transition setSubtype:kCATransitionFromLeft];
        [transition setDelegate:self];
        [self.navigationController.view.layer addAnimation:transition forKey:nil];
    }

    [super viewWillDisappear:animated];
}

编辑：您必须首先添加石英框架才能使用 CATransition

Answer 2

要向后退按钮添加动画，您必须创建自己的后退按钮，并在后退按钮操作上指定所需的动画。

1. 向导航栏添加后退按钮：将此行添加到您的 viewDidLoad 方法中：

   self.navigationItem.leftBarButtonItem=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemReply target:self action:@selector(back)];
   

2. 在后退方法中添加以下代码：

   CATransition *transition = [CATransition 动画];
   过渡.持续时间 = 1;
   transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
   转换类型 = kCATransitionPush;
   过渡.子类型 = kCATransitionFromBottom;
   过渡.委托=自我;
   [self.navigationController.view.layer addAnimation:transition forKey:nil];
   [self.navigationController popViewControllerAnimated:YES];
   

Answer 3

我不确定我是否理解这个问题。 UINavigationController 在切换视图时已经使用了幻灯片转换。如果您想将自定义转换附加到后退按钮，则必须创建一个自定义后退按钮并将其连接到将运行您的 CATransition 代码的操作。

Answer 4

如果您想要像导航控制器栏的后退按钮这样的动画，只需将以下代码放入您的操作中即可。

[self.navigationController popViewControllerAnimated:YES];

Answer 5

Swift 3 版本的 Shadowfax 答案：

    let transition:CATransition = CATransition.init()
    transition.duration = 0.75
    transition.timingFunction = CAMediaTimingFunction.init(name: kCAMediaTimingFunctionEaseInEaseOut)
    transition.type = "oglFlip"
    transition.subtype = kCATransitionFromRight
    //transition.delegate = self // not needed
    self.navigationController?.view.layer.add(transition, forKey:nil)