如何在MvxIosViewPresenter中使用UIViewControllerTransitioningDelegate？

Question

我有一個視圖控制器A和一個視圖控制器B，我想從A到B（模態地）導航自定義轉換（UIViewControllerTransitioningDelegate），我該如何處理MvxIosViewPresenter？

我是否需要自己寫一個完全自定義的演示者，或者有什麼方法可以以優雅的方式進行操作？

Answer 1

完全可以使用MvxIosViewPresenter的自定義轉換。你所要做的就是創建一個自定義UIViewControllerTransitioningDelegate並將其分配給你的ViewController（ViewDidLoad是一個很好的地方）。

像這樣的東西應該做的工作：

[MvxModalPresentation(ModalPresentationStyle = UIModalPresentationStyle.OverFullScreen, ModalTransitionStyle = UIModalTransitionStyle.CrossDissolve)] 
public partial class ModalView : MvxViewController<ModalViewModel> 
{ 
    public ModalView(IntPtr handle) : base(handle) 
    { 
    } 

    public override void ViewDidLoad() 
    { 
     base.ViewDidLoad(); 

     TransitioningDelegate = new TransitioningDelegate(); 
    } 
} 

public class TransitioningDelegate : UIViewControllerTransitioningDelegate 
{ 
    public override IUIViewControllerAnimatedTransitioning GetAnimationControllerForPresentedController(UIViewController presented, UIViewController presenting, UIViewController source) 
    { 
     return new CustomTransitionAnimator(); 
    } 
} 

public class CustomTransitionAnimator : UIViewControllerAnimatedTransitioning 
{ 
    public override double TransitionDuration(IUIViewControllerContextTransitioning transitionContext) 
    { 
     return 1.0f; 
    } 

    public override void AnimateTransition(IUIViewControllerContextTransitioning transitionContext) 
    { 
     var inView = transitionContext.ContainerView; 
     var toVC = transitionContext.GetViewControllerForKey(UITransitionContext.ToViewControllerKey); 
     var toView = toVC.View; 

     inView.AddSubview(toView); 

     var frame = toView.Frame; 
     toView.Frame = CGRect.Empty; 

     UIView.Animate(TransitionDuration(transitionContext),() => 
     { 
      toView.Frame = new CGRect(10, 10, frame.Width - 20, frame.Height - 20); 
     },() => 
     { 
      transitionContext.CompleteTransition(true); 
     }); 
    } 

}