Ios UIViewController自定义转换样式（由内向外表示）

我想制作一个自定义演示（推送或模式），以在我搜索过的“由内而外演示”中显示视图控制器，但大多数方法是从不同的方向（从右、从上）显示视图控制器而不是默认方向，但我需要的是，如果有任何解决方案，将包括viewController中的缩放功能。

您可以实现自己的自定义

UIViewControllerAnimatedTransitioning

。这是C#中自定义圆淡入淡出（由内而外）过渡的示例（在swift中应该不难复制）：

然后，您可以对

UINavigationController

进行子类化，并覆盖其

GetAnimationControllerForOperation（）

委托方法，如下所示：

/// <summary>
/// Navigation controller subclass for assigning custom delegate.
/// </summary>
public partial class NavigationController : UINavigationController
{
    /// <summary>
    /// Initializes a new instance of the <see cref="T:Plimes.NavigationController"/> class.
    /// </summary>
    /// <param name="handle">Handle.</param>
    public NavigationController (IntPtr handle) : base (handle)
    {
        Delegate = new NavigationControllerDelegate();
    }
}

/// <summary>
/// Navigation controller delegate for custom transition animations.
/// </summary>
public class NavigationControllerDelegate : UINavigationControllerDelegate 
{ 
    /// <summary>
    /// Gets the animation controller for operation.
    /// </summary>
    /// <returns>The animation controller for operation.</returns>
    /// <param name="navigationController">Navigation controller.</param>
    /// <param name="operation">Operation.</param>
    /// <param name="fromViewController">From view controller.</param>
    /// <param name="toViewController">To view controller.</param>
    public override IUIViewControllerAnimatedTransitioning GetAnimationControllerForOperation(UINavigationController navigationController, UINavigationControllerOperation operation, UIViewController fromViewController, UIViewController toViewController)
    {
        // If left-right transition is needed
        if (operation == UINavigationControllerOperation.Push)
        {
            var animator = new CircleFadeTransitionAnimator();
            animator.IsPresentation = true;
            return animator;
        }
    }   
}

//
///用于分配自定义委托的导航控制器子类。
/// 
公共部分类NavigationController:UINavigationController
{
/// 
///初始化类的新实例。
/// 
///处理。
公共导航控制器（IntPtr句柄）：基本（句柄）
{
委托=新的NavigationControllerDelegate（）；
}
}
/// 
///用于自定义过渡动画的导航控制器委托。
/// 
公共类NavigationControllerDelegate:UINavigationControllerDelegate
{ 
/// 
///获取用于操作的动画控制器。
/// 
///用于操作的动画控制器。
///导航控制器。
///手术。
///从视图控制器。
///查看控制器。
公共重写IUIViewController或初始化转换GetAnimationController以进行操作（UINavigationController导航控制器、UINavigationController操作、UIViewController从ViewController、UIViewController到ViewController）
{
//如果需要左右转换
if（操作==UINavigationControllerOperation.Push）
{
var animator=新的CircleFadeTransitionAnimator（）；
animator.IsPresentation=true；
返回动画师；
}
}   
}

---

希望这会有帮助

“由内而外的展示”？你得解释一下你在说什么。你看过我的答案吗？它应该能解决你的问题！

/// <summary>
/// Circle animation delegate.
/// </summary>
class CircleAnimationDelegate : CAAnimationDelegate
{
    IUIViewControllerContextTransitioning transitionContext;
    //UIView toView;

    /// <summary>
    /// Initializes a new instance of the <see cref="T:Plimes.CircleAnimationDelegate"/> class.
    /// </summary>
    /// <param name="transitionContext">Transition context.</param>
    public CircleAnimationDelegate(IUIViewControllerContextTransitioning transitionContext)
    {
        this.transitionContext = transitionContext;
        //this.toView = toView;
    }

    /// <summary>
    /// On Animations stopped.
    /// </summary>
    /// <param name="anim">Animation.</param>
    /// <param name="finished">If set to <c>true</c> finished.</param>
    public override void AnimationStopped(CAAnimation anim, bool finished)
    {
        transitionContext.CompleteTransition(!transitionContext.TransitionWasCancelled);
        transitionContext.GetViewControllerForKey(UITransitionContext.ToViewControllerKey).View.Layer.Mask = null;
        transitionContext.GetViewControllerForKey(UITransitionContext.FromViewControllerKey).View.Layer.Mask = null;
        //toView.RemoveFromSuperview();
    }
}

/// <summary>
/// Navigation controller subclass for assigning custom delegate.
/// </summary>
public partial class NavigationController : UINavigationController
{
    /// <summary>
    /// Initializes a new instance of the <see cref="T:Plimes.NavigationController"/> class.
    /// </summary>
    /// <param name="handle">Handle.</param>
    public NavigationController (IntPtr handle) : base (handle)
    {
        Delegate = new NavigationControllerDelegate();
    }
}

/// <summary>
/// Navigation controller delegate for custom transition animations.
/// </summary>
public class NavigationControllerDelegate : UINavigationControllerDelegate 
{ 
    /// <summary>
    /// Gets the animation controller for operation.
    /// </summary>
    /// <returns>The animation controller for operation.</returns>
    /// <param name="navigationController">Navigation controller.</param>
    /// <param name="operation">Operation.</param>
    /// <param name="fromViewController">From view controller.</param>
    /// <param name="toViewController">To view controller.</param>
    public override IUIViewControllerAnimatedTransitioning GetAnimationControllerForOperation(UINavigationController navigationController, UINavigationControllerOperation operation, UIViewController fromViewController, UIViewController toViewController)
    {
        // If left-right transition is needed
        if (operation == UINavigationControllerOperation.Push)
        {
            var animator = new CircleFadeTransitionAnimator();
            animator.IsPresentation = true;
            return animator;
        }
    }   
}