Changed LoadView to be Async (#828)

* Changed LoadView to ValueTask LoadViewAsync and added summaries

* Update src/CommunityToolkit/Xamarin.CommunityToolkit/Views/LazyView/LazyView.shared.cs

Author: pictos

src/CommunityToolkit/Xamarin.CommunityToolkit/Views/LazyView/BaseLazyView.shared.cs

@@ -1,22 +1,40 @@
 using System;
+using System.Threading.Tasks;
 using Xamarin.Forms;
 using Xamarin.Forms.Internals;
 
 namespace Xamarin.CommunityToolkit.UI.Views
 {
-	[Preserve(Conditional =true)]
+	[Preserve(Conditional = true)]
 	public abstract class BaseLazyView : ContentView, IDisposable
 	{
 		internal static readonly BindablePropertyKey IsLoadedPropertyKey = BindableProperty.CreateReadOnly(nameof(IsLoaded), typeof(bool), typeof(BaseLazyView), default);
 
+		/// <summary>
+		/// This is a read-only <see cref="BindableProperty"/> that indicates when the view is loaded.
+		/// </summary>
 		public static readonly BindableProperty IsLoadedProperty = IsLoadedPropertyKey.BindableProperty;
 
+		/// <summary>
+		/// This is a read-only property that indicates when the view is loaded.
+		/// </summary>
 		public bool IsLoaded => (bool)GetValue(IsLoadedProperty);
 
-		internal void SetIsLoaded(bool isLoaded) => SetValue(IsLoadedPropertyKey, isLoaded);
+		/// <summary>
+		/// This method change the value of the <see cref="IsLoaded"/> property.
+		/// </summary>
+		/// <param name="isLoaded"></param>
+		protected void SetIsLoaded(bool isLoaded) => SetValue(IsLoadedPropertyKey, isLoaded);
 
-		public abstract void LoadView();
+		/// <summary>
+		/// Use this method to do the initialization of the <see cref="View"/> and change the status IsLoaded value here.
+		/// </summary>
+		/// <returns><see cref="ValueTask"/></returns>
+		public abstract ValueTask LoadViewAsync();
 
+		/// <summary>
+		/// This method dispose the <see cref="Content"/> if it's <see cref="IDisposable"/>.
+		/// </summary>
 		public void Dispose()
 		{
 			if (Content is IDisposable disposable)

src/CommunityToolkit/Xamarin.CommunityToolkit/Views/LazyView/LazyView.shared.cs

@@ -1,16 +1,26 @@
-using Xamarin.Forms;
+using System.Threading.Tasks;
+using Xamarin.Forms;
 
 namespace Xamarin.CommunityToolkit.UI.Views
 {
+	/// <summary>
+	/// This a basic implementation of the LazyView based on <see cref="BaseLazyView"/> use this an exemple to create yours
+	/// </summary>
+	/// <typeparam name="TView">Any <see cref="View"/></typeparam>
 	public class LazyView<TView> : BaseLazyView where TView : View, new()
 	{
-		public override void LoadView()
+		/// <summary>
+		/// This method initialize your <see cref="LazyView{TView}"/>.
+		/// </summary>
+		/// <returns><see cref="ValueTask"/></returns>
+		public override ValueTask LoadViewAsync()
 		{
 			View view = new TView { BindingContext = BindingContext };
 
 			Content = view;
 
 			SetIsLoaded(true);
+			return new ValueTask(Task.FromResult(true));
 		}
 	}
-}
+}

src/CommunityToolkit/Xamarin.CommunityToolkit/Views/TabView/TabView.shared.cs

@@ -794,7 +794,8 @@ void UpdateSelectedIndex(int position, bool hasCurrentItem = false)
 					}
 
 					if (!lazyView?.IsLoaded ?? false)
-						lazyView?.LoadView();
+						await lazyView.LoadViewAsync();
+
 					var currentTabItem = TabItems[position];
 					currentTabItem.SizeChanged += OnCurrentTabItemSizeChanged;
 					UpdateTabIndicatorPosition(currentTabItem);