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 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($"Trying to show View type: {viewController.GetType().Name} as child, but there is no current Root!");
}
protected override Task <bool> ShowChildViewController(
UIViewController viewController,
MvxChildPresentationAttribute attribute,
MvxViewModelRequest request)
{
if (viewController is IMvxSplitViewController)
{
throw new MvxException("A SplitViewController cannot be presented as a child. Consider using Root instead");
}
if (ModalViewControllers.Any())
{
if (ModalViewControllers.LastOrDefault() is UINavigationController modalNavController)
{
PushViewControllerIntoStack(modalNavController, viewController, attribute);
return(Task.FromResult(true));
}
throw new MvxException($"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 virtual void ShowChildViewController(UIViewController viewController)
{
// dismiss ModalViewController if shown
Window.RootViewController?.DismissViewController(true, null);
// if current RootViewController is a TabBarViewController, the TabBarViewController takes care of it
if (TabBarViewController != null)
{
TabBarViewController?.ShowChildView(viewController);
return;
}
// if current RootViewController is a NavigationController, push it
if (NavigationController != null)
{
NavigationController.PushViewController(viewController, true);
return;
}
// there is no Root, so let's start this way!
Mvx.Trace(MvvmCross.Platform.Platform.MvxTraceLevel.Warning, $"Showing View type: {typeof(UIViewController).Name} as Root, but it's attributed as Child");
ShowRootViewController(viewController);
}