取消软键盘

本文关键字：键盘 取消 | 更新日期: 2023-09-27 18:01:59

我有一个页面，其中的想法是使用外部键盘。当页面加载时，我将焦点设置在Entry控件上，并且我想隐藏软键盘。

这就是我要做的类:

internal class RedactContent : ContentPage
{
    StackLayout stack = new StackLayout();
    Entry entry;
    internal RedactContent()
    {
        entry = new Entry();
        Content = new StackLayout
        {
            Children = {                
                entry,
                //more code
            }
        };
    }
    protected override void OnAppearing()
    {
        base.OnAppearing();
        entry.Focus();
        // Hide Keyboard
    }
}

我该怎么做呢?

取消软键盘

可以用CloseKeyboard方法创建CustomEntry。为此，您需要为每个平台编写自定义渲染器。见http://developer.xamarin.com/guides/cross-platform/xamarin-forms/custom-renderer/

在Android上，你的CustomEntry类看起来像这样:

[assembly: ExportRenderer(typeof(CustomEntry), typeof(CustomEntryRenderer))]
public class CustomEntryRenderer :  EntryRenderer
{
    public CustomEntryRenderer()
    {
        HideKeyboard();
    }
    void HideKeyboard()
    {
        this.Control.InputType = 0;
        InputMethodManager inputMethodManager = this.Control.Context.GetSystemService(Context.InputMethodService) as InputMethodManager;
        inputMethodManager.HideSoftInputFromWindow(this.Control.WindowToken, HideSoftInputFlags.ImplicitOnly);
    }
    // ...
}

* First create a derivated class from Entry
    public class KBLessEntry : Entry
    { 
    public KBLessEntry() : base()
    {
    }
    }
* Then create a custom platform EntryRender
    using Xamarin.Forms.Platform.Android;
    using Xamarin.Forms;
    using MobileClients.Droid.Core;
    using Android.Views.InputMethods;
    using System;
    using System.ComponentModel;
[assembly: ExportRenderer(typeof(KBLessEntry), typeof(KBLessEntryRender))]
namespace MobileClients.Droid.Core
{
    public class KBLessEntryRender : EntryRenderer
    {
        protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            base.OnElementPropertyChanged(sender, e);
            Control.InputType = 0;
            try
            {             
                // Hide keyboard
                InputMethodManager inputMethodManager = this.Control.Context.GetSystemService(Android.Content.Context.InputMethodService) as InputMethodManager;
                if (inputMethodManager != null)
                {
                    inputMethodManager.HideSoftInputFromWindow(this.Control.WindowToken, HideSoftInputFlags.None);
                }
            }
            catch(Exception Ex)
            {
            }
        }
    }
}

和XAML

<local:KBLessEntry x:Name="TxtCode" FontSize="18" Placeholder="Código producto" TextColor="Black" HorizontalOptions="FillAndExpand"></local:KBLessEntry>

local:必须在你的xaml中定义一个命名空间xmlns:local="clr-namespace:MobileClients. droid . core;assembly=MobileClients. "派生的Entry类(在本例中是KBLessEntry)所在的Droid

就这些

View view = ActivityCreateAccount.this.getCurrentFocus();
if (view != null) {
InputMethodManager imm = (InputMethodManager) 
getSystemService(INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
}
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