单点触控:如何使用NavigationController.PushViewController更改视图更改的默认动画

Question

我正在使用NavigationController在我的应用中导航。当PushViewController启动(someUIViewController，true)时，它会使用默认动画更改视图(从子控制器从右向左移动)。如何更改此动画？现在我使用的是：

this.NavigationController.PushViewController(someUIViewController,true);
        UIView.BeginAnimations(null);
        UIView.SetAnimationDuration(0.4);
        UIView.SetAnimationTransition(UIViewAnimationTransition.FlipFromRight, NavigationController.View,true);
        UIView.CommitAnimations();

但是我被限制为四种UIViewAnimationTransition类型，我找到了我需要的(视图从下到上的外观)：

this.NavigationController.PushViewController(someUIViewController,true);
        var theAnimation = CABasicAnimation.FromKeyPath("transform.translation.y");
        theAnimation.Duration = 0.3f;
        theAnimation.From = NSNumber.FromFloat(this.View.Frame.Height);
        theAnimation.To = NSNumber.FromFloat(0f);
        NavigationController.View.Layer.AddAnimation(theAnimation, "animate");
        NavigationController.View.Layer.AnimationForKey("animate");

但是当CABasicAnimation启动时，默认动画(从左到右移动到父控制器)启动too.The结果是错误的combination.How我可以只运行一个(y上的平移)或创建自定义动画吗？

Answer 1

我认为您需要将对PushViewController的调用更改为not animate，以避免默认动画生效。

this.NavigationController.PushViewController(someUIViewController，为真)；

应该是

this.NavigationController.PushViewController(someUIViewController，false)；

Answer 2

也是同样的问题。对于这个问题，没有正常的解决方案。PushViewController受到标准动画(UIViewAnimationTransition类型)的限制。如果您想要更改它们，请尝试以下操作：

NavigationController.PushViewController(screen, false); 
var theAnimation = CABasicAnimation.FromKeyPath("transform.translation.x"); 
theAnimation.Duration = 0.6f; 
theAnimation.From = NSNumber.FromFloat(-NavigationController.View.Frame.Width); 
theAnimation.To = NSNumber.FromFloat(0f); 
NavigationController.View.Layer.AddAnimation(theAnimation, "animate"); 
NavigationController.View.Layer.AnimationForKey("animate"); 

但它并不完美，试一试，你会明白为什么。你也可以使用PresentViewController。它在UIModalTransitionStyle中还有一些其他标准动画：

this.NavigationController.PresentViewController(new UINavigationController(screen){ 
        ModalTransitionStyle= UIModalTransitionStyle.CoverVertical, 
}, true,null);

Answer 3

//Allows a UINavigationController to push using a custom animation transition
public static void PushControllerWithTransition(this UINavigationController 
  target, UIViewController controllerToPush, 
  UIViewAnimationOptions transition)
{
  UIView.Transition(target.View, 0.75d, transition, delegate() {
    target.PushViewController(controllerToPush, false);
  }, null);
}

//Allows a UINavigationController to pop a using a custom animation 
public static void PopControllerWithTransition(this UINavigationController 
  target, UIViewAnimationOptions transition)
{
  UIView.Transition(target.View, 0.75d, transition, delegate() {
    target.PopViewControllerAnimated(false);
  }, null);         
}

//有了这些扩展，现在使用翻转动画在控制器之间移动就像下面这样简单：

//Pushing someController to the top of the stack
NavigationController.PushControllerWithTransition(someController, 
  UIViewAnimationOptions.TransitionFlipFromLeft);

//Popping the current controller off the top of the stack
NavigationController.PopControllerWithTransition(
  UIViewAnimationOptions.TransitionFlipFromRight);