回答編集履歴
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他の解決方法を追記
test
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@@ -27,3 +27,187 @@
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```
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---
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ちょっと本格的に、画面が表示されるタイミングでフォーカスを当てる様なエフェクトを作ってみました。
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Androidプロジェクト
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```C#
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[assembly: ResolutionGroupName("BlankApp1")]
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[assembly: ExportEffect(typeof(FocusEffect), nameof(FocusEffect))]
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namespace BlankApp1.Droid
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{
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public class FocusEffect : PlatformEffect
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{
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private Listener _listener;
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protected override void OnAttached()
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{
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_listener = new Listener(this);
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Control.ViewTreeObserver.AddOnPreDrawListener(_listener);
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}
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protected override void OnDetached()
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{
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if (_listener != null)
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{
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Control.ViewTreeObserver.RemoveOnPreDrawListener(_listener);
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_listener = null;
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}
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}
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private void Focus()
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{
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(Element as VisualElement)?.Focus();
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if (_listener != null)
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{
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Control.ViewTreeObserver.RemoveOnPreDrawListener(_listener);
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_listener = null;
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}
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}
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private class Listener : Java.Lang.Object, ViewTreeObserver.IOnPreDrawListener
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{
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private FocusEffect _effect;
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public Listener(FocusEffect effect)
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{
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_effect = effect;
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}
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public bool OnPreDraw()
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{
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_effect.Focus();
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return true;
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}
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}
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}
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}
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```
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共通プロジェクト
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```C#
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namespace BlankApp1.Effects
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{
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public class FocusEffect : RoutingEffect
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{
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public FocusEffect() : base($"BlankApp1.{nameof(FocusEffect)}")
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{
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}
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}
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}
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```
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```xml
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<?xml version="1.0" encoding="utf-8" ?>
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<ContentPage
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x:Class="BlankApp1.Views.LoginPage"
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xmlns="http://xamarin.com/schemas/2014/forms"
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xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
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xmlns:b="clr-namespace:BlankApp1.Behavior"
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xmlns:e="clr-namespace:BlankApp1.Effects"
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xmlns:prism="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
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prism:ViewModelLocator.AutowireViewModel="True">
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<StackLayout Style="{StaticResource StackLayoutStyle}">
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<Entry x:Name="User" >
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<Entry.Effects>
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<e:FocusEffect />
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</Entry.Effects>
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</Entry>
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</StackLayout>
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</ContentPage>
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```
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