Пользовательский стиль перехода UIViewController (презентация изнутри)

Question

Я хочу создать пользовательскую презентацию (push или modal), чтобы отобразить контроллер представления в «Inside out presentation», который я просматривал, но большинство способов - представить контроллер вида из другого (справа, сверху) вместо направления по умолчанию, но то, что мне нужно, это то, что будет включать масштабирование масштабирования в viewController, если есть какое-либо решение для этого.

Answer 1

Вы можете реализовать свой собственный UIViewControllerAnimatedTransitioning. Это пример пользовательского круга замирания (наизнанку) перехода в C# (не должно быть трудно воспроизвести в стрижа):

/// <summary> 
/// Circle fade transition animator. 
/// </summary> 
public class CircleFadeTransitionAnimator : UIViewControllerAnimatedTransitioning 
{ 
    public bool IsPresentation = true; 
    nfloat screenHeight = UIScreen.MainScreen.Bounds.Height; 
    nfloat screenWidth = UIScreen.MainScreen.Bounds.Width; 

    public override void AnimateTransition(IUIViewControllerContextTransitioning transitionContext) 
    { 
     //The current view controller 
     var fromVC = transitionContext.GetViewControllerForKey(UITransitionContext.FromViewControllerKey); 
     var fromView = fromVC.View; 

     //The view controller we wish to present to the user 
     var toVC = transitionContext.GetViewControllerForKey(UITransitionContext.ToViewControllerKey); 
     var toView = toVC.View; 

     // Set up some variables for the animation. 
     var containerView = transitionContext.ContainerView; 

     // Always add the "to" view to the container. 
     // And it doesn't hurt to set its start frame. 
     containerView.AddSubview(toView); 

     // Creates two circular UIBezierPath instances; one is the size of the button, and the second has a radius 
     // large enough to cover the entire screen. The final animation will be between these two bezier paths. 
     CGSize size; 
     if (fromVC is LogInViewController) 
      size = new CGSize(5, 5); 
     else 
      size = new CGSize(screenWidth * 0.65, screenWidth * 0.65); 

     var startingRect = new CGRect(screenWidth/2 - size.Width/2, screenHeight/2 - size.Height/2, size.Width, size.Height); 
     var circleMaskPathInitial = UIBezierPath.FromOval(startingRect); 
     var extremePoint = new CGPoint(screenWidth/2, screenHeight/2 - toView.Bounds.Height); 
     var radius = (nfloat) Math.Sqrt((extremePoint.X * extremePoint.X) + (extremePoint.Y * extremePoint.Y)); 
     var circleMaskPathFinal = UIBezierPath.FromOval(startingRect.Inset(-radius, -radius)); 

     // Creates a new CAShapeLayer to represent the circle mask. Assign its path value with the final circular path 
     // after the animation to avoid the layer snapping back after the animation completes. 
     var maskLayer = new CAShapeLayer(); 
     maskLayer.Path = circleMaskPathFinal.CGPath; 
     toVC.View.Layer.Mask = maskLayer; 

     // Creates a CABasicAnimation on the path key path that goes from circleMaskPathInitial to circleMaskPathFinal. 
     var maskLayerAnimation = CABasicAnimation.FromKeyPath("path"); 
     maskLayerAnimation.SetFrom(circleMaskPathInitial.CGPath); 
     maskLayerAnimation.SetTo(circleMaskPathFinal.CGPath); 
     maskLayerAnimation.Duration = TransitionDuration(transitionContext); 
     maskLayerAnimation.Delegate = new CircleAnimationDelegate(transitionContext); 
     maskLayer.AddAnimation(maskLayerAnimation, "path"); 
    } 

    /// <summary> 
    /// How long will the transition last? 
    /// </summary> 
    /// <returns>The duration.</returns> 
    /// <param name="transitionContext">Transition context.</param> 
    public override double TransitionDuration(IUIViewControllerContextTransitioning transitionContext) 
    { 
     return 0.3; 
    } 
} 

Вы также должны реализовать свой собственный CAAnimationDelegate как следующее:

/// <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(); 
    } 
} 

Тогда вы можете унаследовать свой UINavigationController и переопределить его метод GetAnimationControllerForOperation() делегата вроде этого:

/// <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; 
     } 
    } 
} 

Надеется, что это Wi помогите!