Add attribute to show page on iOS (#3339)

* Add attribute to show page on iOS

* Fixed some small issues in iOS

* Adjusted the implementation for TvOs

* Added all the views and viewmodels for the ios sample

* Updated the page views

* Added all the views to the storyboard, added the right viewmodels and updated the presenters

* Updated the MvxPageViewController, so we now hold a list of pages in there so we can show them correctly

MvvmCross/Platforms/Ios/Presenters/Attributes/MvxPagePresentationAttribute.cs

@@ -0,0 +1,14 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MS-PL license.
+// See the LICENSE file in the project root for more information.
+
+using MvvmCross.Presenters.Attributes;
+
+namespace MvvmCross.Platforms.Ios.Presenters.Attributes
+{
+    public class MvxPagePresentationAttribute : MvxBasePresentationAttribute
+    {
+        public static bool DefaultWrapInNavigationController = false;
+        public bool WrapInNavigationController { get; set; } = DefaultWrapInNavigationController;
+    }
+}

MvvmCross/Platforms/Ios/Presenters/MvxIosViewPresenter.cs

@@ -30,6 +30,8 @@ public class MvxIosViewPresenter : MvxAttributeViewPresenter, IMvxIosViewPresent
 
         public IMvxTabBarViewController TabBarViewController { get; protected set; }
 
+        public IMvxPageViewController PageViewController { get; protected set; }
+
         public IMvxSplitViewController SplitViewController { get; protected set; }
 
         public override MvxBasePresentationAttribute CreatePresentationAttribute(Type viewModelType, Type viewType)
@@ -109,6 +111,14 @@ public override void RegisterAttributeTypes()
                     },
                     CloseTabViewController);
 
+            AttributeTypesToActionsDictionary.Register<MvxPagePresentationAttribute>(
+                (viewType, attribute, request) =>
+                    {
+                        var viewController = (UIViewController)this.CreateViewControllerFor(request);
+                        return ShowPageViewController(viewController, attribute, request);
+                    },
+                    ClosePageViewController);
+
             AttributeTypesToActionsDictionary.Register<MvxModalPresentationAttribute>(
                 (viewType, attribute, request) =>
                     {
@@ -166,6 +176,19 @@ public override void RegisterAttributeTypes()
                 return true;
             }
 
+            if (viewController is IMvxPageViewController pageViewController)
+            {
+                PageViewController = pageViewController;
+
+                // set root
+                SetupWindowRootNavigation(viewController, attribute);
+
+                if (!await CloseModalViewControllers()) return false;
+                if (!await CloseSplitViewController()) return false;
+
+                return true;
+            }
+
             // check if viewController is a SplitViewController
             if (viewController is IMvxSplitViewController splitController)
             {
@@ -300,6 +323,30 @@ protected void SetupWindowRootNavigation(UIViewController viewController, MvxRoo
             return Task.FromResult(true);
         }
 
+        protected virtual Task<bool> ShowPageViewController(
+            UIViewController viewController,
+            MvxPagePresentationAttribute attribute,
+            MvxViewModelRequest request)
+        {
+            if (PageViewController == null)
+                throw new MvxException("Trying to show a page without a PageViewController, this is not possible!");
+
+            /*if (viewController is IMvxTabBarItemViewController tabBarItem)
+            {
+                attribute.TabName = tabBarItem.TabName;
+                attribute.TabIconName = tabBarItem.TabIconName;
+                attribute.TabSelectedIconName = tabBarItem.TabSelectedIconName;
+            }*/
+
+            if (attribute.WrapInNavigationController)
+                viewController = CreateNavigationController(viewController);
+
+            PageViewController.AddPage(
+                viewController,
+                attribute);
+            return Task.FromResult(true);
+        }
+
         protected virtual Task<bool> ShowModalViewController(
             UIViewController viewController,
             MvxModalPresentationAttribute attribute,
@@ -393,6 +440,14 @@ protected virtual Task<bool> CloseTabViewController(IMvxViewModel viewModel, Mvx
             return Task.FromResult(false);
         }
 
+        protected virtual Task<bool> ClosePageViewController(IMvxViewModel viewModel, MvxPagePresentationAttribute attribute)
+        {
+            if (PageViewController != null && PageViewController.RemovePage(viewModel))
+                return Task.FromResult(true);
+
+            return Task.FromResult(false);
+        }
+
         protected virtual Task<bool> CloseMasterSplitViewController(IMvxViewModel viewModel, MvxSplitViewPresentationAttribute attribute)
         {
             if (SplitViewController != null && SplitViewController.CloseChildViewModel(viewModel, attribute))

MvvmCross/Platforms/Ios/Views/IMvxPageViewController.cs

@@ -0,0 +1,17 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MS-PL license.
+// See the LICENSE file in the project root for more information.
+
+using MvvmCross.Platforms.Ios.Presenters.Attributes;
+using MvvmCross.ViewModels;
+using UIKit;
+
+namespace MvvmCross.Platforms.Ios.Views
+{
+    public interface IMvxPageViewController
+    {
+        void AddPage(UIViewController viewController, MvxPagePresentationAttribute attribute);
+
+        bool RemovePage (IMvxViewModel viewModel);
+    }
+}

MvvmCross/Platforms/Ios/Views/MvxBasePageViewController.cs

@@ -0,0 +1,168 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MS-PL license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using Foundation;
+using MvvmCross.Logging;
+using MvvmCross.Binding.BindingContext;
+using MvvmCross.Platforms.Ios.Views.Base;
+using MvvmCross.ViewModels;
+using UIKit;
+
+namespace MvvmCross.Platforms.Ios.Views
+{
+    public class MvxBasePageViewController : MvxEventSourcePageViewController, IMvxIosView
+    {
+        public MvxBasePageViewController(UIPageViewControllerTransitionStyle style = UIPageViewControllerTransitionStyle.Scroll, UIPageViewControllerNavigationOrientation navigationOrientation = UIPageViewControllerNavigationOrientation.Horizontal, UIPageViewControllerSpineLocation spineLocation = UIPageViewControllerSpineLocation.None) : base(style, navigationOrientation, spineLocation)
+        {
+            this.AdaptForBinding();
+        }
+
+        public MvxBasePageViewController(UIPageViewControllerTransitionStyle style, UIPageViewControllerNavigationOrientation navigationOrientation, UIPageViewControllerSpineLocation spineLocation, float interPageSpacing) : base(style, navigationOrientation, spineLocation, interPageSpacing)
+        {
+            this.AdaptForBinding();
+        }
+
+        public MvxBasePageViewController(UIPageViewControllerTransitionStyle style, UIPageViewControllerNavigationOrientation navigationOrientation) : base(style, navigationOrientation)
+        {
+            this.AdaptForBinding();
+        }
+
+        public MvxBasePageViewController(NSCoder coder) : base(coder)
+        {
+            this.AdaptForBinding();
+        }
+
+        protected MvxBasePageViewController(NSObjectFlag t) : base(t)
+        {
+            this.AdaptForBinding();
+        }
+
+        protected internal MvxBasePageViewController(IntPtr handle) : base(handle)
+        {
+            this.AdaptForBinding();
+        }
+
+        public MvxBasePageViewController(string nibName, NSBundle bundle) : base(nibName, bundle)
+        {
+            this.AdaptForBinding();
+        }
+
+        public MvxBasePageViewController(UIPageViewControllerTransitionStyle style, UIPageViewControllerNavigationOrientation navigationOrientation, NSDictionary options) : base(style, navigationOrientation, options)
+        {
+            this.AdaptForBinding();
+        }
+        public object DataContext
+        {
+            get
+            {
+                // special code needed in PageViewController because View is initialized during construction
+                return BindingContext?.DataContext;
+            }
+            set
+            {
+                BindingContext.DataContext = value;
+            }
+        }
+
+        public IMvxViewModel ViewModel
+        {
+            get { return DataContext as IMvxViewModel; }
+            set { DataContext = value; }
+        }
+
+        public MvxViewModelRequest Request { get; set; }
+
+        public IMvxBindingContext BindingContext { get; set; }
+
+        public override void ViewDidLoad()
+        {
+            base.ViewDidLoad();
+            ViewModel?.ViewCreated();
+        }
+
+        public override void ViewWillAppear(bool animated)
+        {
+            base.ViewWillAppear(animated);
+            ViewModel?.ViewAppearing();
+        }
+
+        public override void ViewDidAppear(bool animated)
+        {
+            base.ViewDidAppear(animated);
+            ViewModel?.ViewAppeared();
+        }
+
+        public override void ViewWillDisappear(bool animated)
+        {
+            base.ViewWillDisappear(animated);
+            ViewModel?.ViewDisappearing();
+        }
+
+        public override void ViewDidDisappear(bool animated)
+        {
+            base.ViewDidDisappear(animated);
+            ViewModel?.ViewDisappeared();
+        }
+
+        public override void DidMoveToParentViewController(UIViewController parent)
+        {
+            base.DidMoveToParentViewController(parent);
+            if (parent == null)
+                ViewModel?.ViewDestroy();
+        }
+
+        public override void PrepareForSegue(UIStoryboardSegue segue, NSObject sender)
+        {
+            base.PrepareForSegue(segue, sender);
+            this.ViewModelRequestForSegue(segue, sender);
+        }
+    }
+
+    public class MvxBasePageViewController<TViewModel> : MvxPageViewController, IMvxIosView<TViewModel> where TViewModel : class, IMvxViewModel
+    {
+        public MvxBasePageViewController()
+        {
+        }
+
+        public MvxBasePageViewController(NSCoder coder) : base(coder)
+        {
+        }
+
+        public MvxBasePageViewController(UIPageViewControllerTransitionStyle style, UIPageViewControllerNavigationOrientation navigationOrientation) : base(style, navigationOrientation)
+        {
+        }
+
+        public MvxBasePageViewController(string nibName, NSBundle bundle) : base(nibName, bundle)
+        {
+        }
+
+        public MvxBasePageViewController(UIPageViewControllerTransitionStyle style, UIPageViewControllerNavigationOrientation navigationOrientation, UIPageViewControllerSpineLocation spineLocation) : base(style, navigationOrientation, spineLocation)
+        {
+        }
+
+        public MvxBasePageViewController(UIPageViewControllerTransitionStyle style, UIPageViewControllerNavigationOrientation navigationOrientation, NSDictionary options) : base(style, navigationOrientation, options)
+        {
+        }
+
+        public MvxBasePageViewController(UIPageViewControllerTransitionStyle style, UIPageViewControllerNavigationOrientation navigationOrientation, UIPageViewControllerSpineLocation spineLocation, float interPageSpacing) : base(style, navigationOrientation, spineLocation, interPageSpacing)
+        {
+        }
+
+        protected MvxBasePageViewController(NSObjectFlag t) : base(t)
+        {
+        }
+
+        protected internal MvxBasePageViewController(IntPtr handle) : base(handle)
+        {
+        }
+
+        public new TViewModel ViewModel
+        {
+            get { return (TViewModel)base.ViewModel; }
+            set { base.ViewModel = value; }
+        }
+    }
+}