public override ValueTask <MvxBasePresentationAttribute?> CreatePresentationAttribute(Type?viewModelType, Type?viewType)
{
if (MasterNavigationController == null &&
(TabBarViewController == null || !TabBarViewController.CanShowChildView()))
{
MvxLog.Instance.Trace($"PresentationAttribute nor MasterNavigationController found for {viewType.Name}. " +
$"Assuming Root presentation");
var rootAttribute = new MvxRootPresentationAttribute()
{
WrapInNavigationController = true,
ViewType = viewType,
ViewModelType = viewModelType
};
return(new ValueTask <MvxBasePresentationAttribute?>(rootAttribute));
}
MvxLog.Instance.Trace($"PresentationAttribute not found for {viewType?.Name}. " +
$"Assuming animated Child presentation");
var childAttribute = new MvxChildPresentationAttribute()
{
ViewType = viewType,
ViewModelType = viewModelType
};
return(new ValueTask <MvxBasePresentationAttribute?>(childAttribute));
}
protected virtual bool CloseChildViewController(IMvxViewModel viewModel, MvxChildPresentationAttribute attribute)
{
// if there are modals presented
if (ModalViewControllers.Any())
{
foreach (var modalNav in ModalViewControllers.Where(v => v is UINavigationController))
{
if (TryCloseViewControllerInsideStack((UINavigationController)modalNav, viewModel))
{
return(true);
}
}
}
//if the current root is a TabBarViewController, delegate close responsibility to it
if (TabBarViewController != null && TabBarViewController.CloseChildViewModel(viewModel))
{
return(true);
}
if (SplitViewController != null && SplitViewController.CloseChildViewModel(viewModel))
{
return(true);
}
// if the current root is a NavigationController, close it in the stack
if (MasterNavigationController != null && TryCloseViewControllerInsideStack(MasterNavigationController, viewModel))
{
return(true);
}
return(false);
}
protected virtual void ShowChildViewController(
UIViewController viewController,
MvxChildPresentationAttribute attribute,
MvxViewModelRequest request)
{
if (viewController is IMvxSplitViewController)
{
throw new MvxException("A SplitViewController cannot be presented as a child. Consider using Root instead");
}
if (ModalNavigationController != null)
{
ModalNavigationController.PushViewController(viewController, attribute.Animated);
return;
}
if (TabBarViewController != null && TabBarViewController.ShowChildView(viewController))
{
return;
}
if (MasterNavigationController != null)
{
MasterNavigationController.PushViewController(viewController, attribute.Animated);
if (viewController is IMvxTabBarViewController)
{
TabBarViewController = viewController as IMvxTabBarViewController;
}
return;
}
throw new MvxException($"Trying to show View type: {viewController.GetType().Name} as child, but there is no current Root!");
}
protected virtual ValueTask <bool> ShowChildViewController(UIViewController viewController,
MvxChildPresentationAttribute attribute,
MvxViewModelRequest request)
{
if (viewController is MvxSplitViewController)
{
throw new MvxException("A SplitViewController can't be present in a child. Consider using a Root instead.");
}
if (ModalViewControllers.Any())
{
if (ModalViewControllers.LastOrDefault() is UINavigationController navigationController)
{
PushViewControllerIntoStack(navigationController, viewController, attribute.Animated);
return(new ValueTask <bool>(true));
}
else
{
throw new MvxException($"Trying to show View type: {viewController.GetType().Name} as child, but there is currently a plain modal view presented!");
}
}
if (TabBarViewController != null && TabBarViewController.ShowChildView(viewController))
{
return(new ValueTask <bool>(true));
}
if (MasterNavigationController != null)
{
PushViewControllerIntoStack(MasterNavigationController, viewController, attribute.Animated);
return(new ValueTask <bool>(true));
}
throw new MvxException($"Trying to show View type: {viewController.GetType().Name} as child, but there is no current stack!");
}
protected virtual bool CloseChildViewController(IMvxViewModel viewModel, MvxChildPresentationAttribute attribute)
{
if (ModalViewControllers.Any())
{
foreach (var navController in ModalViewControllers.Where(v => v is UINavigationController))
{
if (TryCloseViewControllerInsideStack((UINavigationController)navController, viewModel))
{
return(true);
}
}
}
if (TabBarViewController != null && TabBarViewController.CloseChildViewModel(viewModel))
{
return(true);
}
if (MasterNavigationController != null && TryCloseViewControllerInsideStack(MasterNavigationController, viewModel))
{
return(true);
}
return(false);
}
protected MvxBasePresentationAttribute GetPresentationAttributes(UIViewController viewController)
{
var attributes = viewController.GetType().GetCustomAttributes(typeof(MvxBasePresentationAttribute), true).FirstOrDefault() as MvxBasePresentationAttribute;
if (attributes == null)
{
MvxTrace.Trace($"PresentationAttribute not found for {viewController.GetType().Name}, assuming animated Child presentation");
attributes = new MvxChildPresentationAttribute();
}
return(attributes);
}
protected override Task <bool> ShowChildViewController(
UIViewController viewController,
MvxChildPresentationAttribute attribute,
MvxViewModelRequest request)
{
if (viewController is IMvxSplitViewController)
{
throw new MvxException("A SplitViewController cannot be presented as a child. Consider using Root instead");
}
if (ModalViewControllers.Any())
{
if (ModalViewControllers.LastOrDefault() is UINavigationController modalNavController)
{
PushViewControllerIntoStack(modalNavController, viewController, attribute);
return(Task.FromResult(true));
}
throw new MvxException($"Trying to show View type: {viewController.GetType().Name} as child, but there is currently a plain modal view presented!");
}
if (TabBarViewController != null)
{
if (request.PresentationValues != null &&
request.PresentationValues.ContainsKey(Presenter.NavigationModeKey))
{
if (request.PresentationValues[Presenter.NavigationModeKey] == Presenter.ReplaceKey)
{
if (TabBarViewController is MainView mv)
{
mv.ReplaceTopChildViewModel(viewController);
return(Task.FromResult(true));
}
}
}
else
{
return(Task.FromResult(TabBarViewController.ShowChildView(viewController)));
}
}
if (MasterNavigationController != null)
{
PushViewControllerIntoStack(MasterNavigationController, viewController, attribute);
return(Task.FromResult(true));
}
throw new MvxException($"Trying to show View type: {viewController.GetType().Name} as child, but there is no current stack!");
}
protected override void ShowChildViewController(UIViewController viewController, MvxChildPresentationAttribute attribute, MvxViewModelRequest request)
{
if (request.ViewModelType == typeof(LoginViewModel))
{
MasterNavigationController.View.Layer.AddAnimation(fadeAnimation, CALayer.Transition);
MasterNavigationController.PushViewController(viewController, false);
return;
}
base.ShowChildViewController(viewController, attribute, request);
}
protected virtual void PushViewControllerIntoStack(UINavigationController navigationController, UIViewController viewController, MvxChildPresentationAttribute attribute)
{
navigationController.PushViewController(viewController, attribute.Animated);
if (viewController is IMvxTabBarViewController tabBarController)
{
TabBarViewController = tabBarController;
}
}
protected virtual bool TryCloseViewControllerInsideStack(UINavigationController navController, IMvxViewModel toClose, MvxChildPresentationAttribute attribute)
{
// check for top view controller
var topView = navController.TopViewController.GetIMvxIosView();
if (topView != null && topView.ViewModel == toClose)
{
navController.PopViewController(attribute.Animated);
return(true);
}
// loop through stack
var controllers = navController.ViewControllers.ToList();
var controllerToClose = controllers.FirstOrDefault(vc => vc.GetIMvxIosView().ViewModel == toClose);
if (controllerToClose != null)
{
controllers.Remove(controllerToClose);
navController.ViewControllers = controllers.ToArray();
return(true);
}
return(false);
}
protected override void ShowChildViewController(UIViewController viewController, MvxChildPresentationAttribute attribute, MvxViewModelRequest request)
{
//Fix to show tabchild child view correctly
if (MasterNavigationController != null)
{
MasterNavigationController.PushViewController(viewController, attribute.Animated);
if (viewController is IMvxTabBarViewController)
{
TabBarViewController = viewController as IMvxTabBarViewController;
}
return;
}
//throw new MvxException($"Trying to show View type: {viewController.GetType().Name} as child, but there is no current stack!");
}
