如何在Xamarin Forms中按下按钮上的键盘

Question

经过多次狩猎后,我找到了一种方法,可以在Xamarin Forms的按钮上隐藏键盘,适用于iOS机箱.所以它在下面分享.

如果有人可以改进它,或者为Android方共享解决方案,那就太好了.

Answer 1

我觉得这很有用:

https://forums.xamarin.com/discussion/comment/172077#Comment_172077

接口:

public interface IKeyboardHelper
{
    void HideKeyboard();
}

iOS版:

public class iOSKeyboardHelper : IKeyboardHelper
{
    public void HideKeyboard()
    {
        UIApplication.SharedApplication.KeyWindow.EndEditing(true);
    }
}

机器人:

public class DroidKeyboardHelper : IKeyboardHelper
{
    public void HideKeyboard()
    {
        var context = Forms.Context;
        var inputMethodManager = context.GetSystemService(Context.InputMethodService) as InputMethodManager;
        if (inputMethodManager != null && context is Activity)
        {
            var activity = context as Activity;
            var token = activity.CurrentFocus?.WindowToken;
            inputMethodManager.HideSoftInputFromWindow(token, HideSoftInputFlags.None);

            activity.Window.DecorView.ClearFocus();
        }
    }
}

在Xamarin表单中的用法:

DependencyService.Get<IKeyboardHelper>().HideKeyboard();

Answer 2

 view.Unfocus();

就是这样。

有些人报告这不起作用，但它对我来说就像大片一样。

Answer 3

如果经过大量搜索后移除焦点方法对您不起作用（并且对我不起作用），我发现了一种强制关闭键盘的简单方法。

FindViewById<EditText>(Resource.Id.edittextname).Enabled = false;
FindViewById<EditText>(Resource.Id.edittextname).Enabled = true;

就是这样。只需禁用并启用它，它就会关闭键盘。

Answer 4

这是我隐藏Android端虚拟键盘的解决方案.

我编写了一个具有HideKeyboard()方法的IKeyboardInteractions接口.然后我在MyProject.Droid中声明了一个实现IKeyboardInteractions的KeyboardInteractions类:

常用代码:

public interface IKeyboardInteractions {
    void HideKeyboard();
}

MyProject.Droid代码:

[assembly: Dependency (typeof (KeyboardInteractions))] namespace MyProject.Droid
{
    public class KeyboardInteractions : IKeyboardInteractions
    {
        public void HideKeyboard()
        {
            var inputMethodManager = Xamarin.Forms.Forms.Context.GetSystemService(Context.InputMethodService) as InputMethodManager;
            if (inputMethodManager != null && Xamarin.Forms.Forms.Context is Activity)
            {
                var activity = Xamarin.Forms.Forms.Context as Activity;
                var token = activity.CurrentFocus == null ? null : activity.CurrentFocus.WindowToken;
                inputMethodManager.HideSoftInputFromWindow(token, 0);
            }
        }
    }
}

消费方法:

IKeyboardInteractions keyboardInteractions = DependencyService.Get<IKeyboardInteractions>();
keyboardInteractions.HideKeyboard ();

Answer 5

这是基于 Xamarin Forms 2.5 中弃用更改的 F. Badili 解决方案的更新版本。唯一的区别是如何在 Android 类中访问 Context。

在Xamarin Forms项目中：

public interface IKeyboardHelper
{
    void HideKeyboard();
}   

在iOS项目中：

using System;
using Xamarin.Forms;
using ProjectName;
using ProjectName.iOS;
using UIKit;

[assembly: Dependency(typeof(iOSKeyboardHelper))]
namespace ProjectName.iOS
{
    public class iOSKeyboardHelper : IKeyboardHelper
    {
        public void HideKeyboard()
        {
            UIApplication.SharedApplication.KeyWindow.EndEditing(true);
        }
    }
}

在机器人项目中：

using System;
using Xamarin.Forms;
using ProjectName;
using ProjectName.Droid;
using Xamarin.Forms.Platform.Android;
using Android.Views.InputMethods;
using Android.App;
using Android.Content;

[assembly: Xamarin.Forms.Dependency(typeof(DroidKeyboardHelper))] 
namespace ProjectName.Droid
{
    public class DroidKeyboardHelper : IKeyboardHelper
    {
        public void HideKeyboard()
        {
            var context = Android.App.Application.Context;
            var inputMethodManager = context.GetSystemService(Context.InputMethodService) as InputMethodManager;
            if (inputMethodManager != null && context is Activity)
            {
                var activity = context as Activity;
                var token = activity.CurrentFocus?.WindowToken;
                inputMethodManager.HideSoftInputFromWindow(token, HideSoftInputFlags.None);

                activity.Window.DecorView.ClearFocus();
            }
        }
    }
}

在Xamarin 表单页面中：

DependencyService.Get<IKeyboardHelper>().HideKeyboard();

Answer 6

即使使用 Kenan Casey 的更新，我也无法让 F. Badili 的 Android 解决方案正常工作。进一步的谷歌搜索将我带到了Dave 的技术博客，了解Xamarin.Forms.Forms.Context. 它说Android.App.Application.Context不是并且无法转换为Activty（至少就我而言，请参阅博客文章的评论以获取解释）。

在Droid 项目中：

[assembly: Xamarin.Forms.Dependency(typeof(DroidKeyboardHelper))] 
namespace ProjectName.Droid{
    public class DroidKeyboardHelper : IKeyboardHelper {
        static Context _context;

        public static void Init(Context context) => _context = context;

        public void HideKeyboard(){
            var inputMethodManager = _context.GetSystemService(Context.InputMethodService) as InputMethodManager;
            if (inputMethodManager != null && _context is Activity) {
                var activity = _context as Activity;
                var token = activity.CurrentFocus?.WindowToken;
                inputMethodManager.HideSoftInputFromWindow(token, HideSoftInputFlags.None);

                activity.Window.DecorView.ClearFocus();
            }
        }
    }
}

在Droid MainActivity.cs中：

protected override void OnCreate(Bundle savedInstanceState){
    base.OnCreate(savedInstanceState);
    ...
    KeyboardHelper.Init(this);
    ...
    LoadApplication(new App());
}

笔记：

仅当您的应用程序仅在单个 Activity 上运行时，这才有效。如果您的应用程序有多个活动，请参阅Dave 的技术博客，了解适合您的案例的正确实施方式。

Answer 7

在共享/PCL项目中，添加：

using System;
using Xamarin.Forms;

namespace MyApp.Views
{
    public class ButtonKeyboardHiding : Button {}
}

在表单中使用此类代替 Button。

在iOS项目中添加：

using System;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;
using Foundation;
using UIKit;
using MyApp.Views;
using MyApp.iOS;

[assembly: ExportRenderer ( typeof (ButtonKeyboardHiding), typeof (ButtonKeyboardHidingRenderer ) ) ]

namespace MyApp.iOS
{
    public class ButtonKeyboardHidingRenderer : ButtonRenderer
    {
        protected override void OnElementChanged ( ElementChangedEventArgs<Button> e )
        {
            base.OnElementChanged  (e );

            if ( Control != null ) 
            {   
                Control.TouchUpInside += ( sender, el ) =>
                {
                    UIView ctl = Control;
                    while ( true )
                    {
                        ctl = ctl.Superview;
                        if ( ctl.Description.Contains ( "UIView" ) )
                            break;
                    }
                    ctl.EndEditing ( true );
                };
            }
        }
    }
}