在自定义渲染器中更改Xamarin.Forms.Entry的键盘的ImeOptions在Android上不起作用 [英] Changing keyboard's ImeOptions of Xamarin.Forms.Entry in custom renderer not working on Android

问题描述

我所拥有的:

我有一个从Xamarin.Forms.Entry派生的自定义类MyEntry和一个用于Android和iOS的自定义渲染器类MyEntryRenderer.

I have a custom class MyEntry derived from Xamarin.Forms.Entry and custom renderer classes MyEntryRenderer for Android and iOS.

我想要的东西:

我想通过更改Android上的ImeOptions和iOS上的ReturnKeyType将键盘的输入"按钮更改为搜索"按钮(请参见示例代码).当我按下更改的搜索"按钮时，应该调用MyEntry.Completed事件(就像在我按下未更改的输入"按钮之前一样.

I want to change the keyboard's "enter"-button to a "search"-button by changing ImeOptions on Android and ReturnKeyType on iOS (see sample code). When I press the altered "search"-button, the MyEntry.Completed event should be called (like before when I pressed the un-altered "enter"-button.

实际发生的事情:

在iOS上，代码按预期工作.但是在Android上什么也没有发生.该事件不会被调用.

On iOS the code works like expected. But on Android nothing happens. The event doesn't get called.

我的问题:

如何实现上面在Android上描述的内容?

How can I achieve what I described above on Android?

示例代码:

App.cs:

namespace CustomEntry
{
    public class App
    {
        public static Page GetMainPage()
        {    
            MyEntry entry = new MyEntry {
                VerticalOptions = LayoutOptions.CenterAndExpand,
                HorizontalOptions = LayoutOptions.CenterAndExpand,
                Placeholder = "Enter some text"
            };

            entry.Completed += delegate {
                Console.WriteLine("Completed");
            };

            return new ContentPage { 
                Content = entry,
            };
        }
    }
}

MyEntry.cs:

MyEntry.cs:

namespace CustomEntry
{
    public class MyEntry:Entry
    {

    }
}

MyEntryRenderer.cs(Android):

MyEntryRenderer.cs (Android):

[assembly: ExportRenderer(typeof(MyEntry), typeof(MyEntryRenderer))]
namespace CustomEntry.Android
{
    public class MyEntryRenderer:EntryRenderer
    {

        protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
        {
            base.OnElementChanged(e);

            if (Control != null) { 
                Control.ImeOptions = global::Android.Views.InputMethods.ImeAction.Search;
            }
        }

    }
}

MyEntryRenderer.cs(iOS):

MyEntryRenderer.cs (iOS):

[assembly: ExportRenderer(typeof(MyEntry), typeof(MyEntryRenderer))]
namespace CustomEntry.iOS
{
    public class MyEntryRenderer:EntryRenderer
    {

        protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
        {
            base.OnElementChanged(e);

            if (Control != null) {
                Control.ReturnKeyType = UIReturnKeyType.Search;
            }
        }

    }
}

推荐答案

我自己找到了解决问题的方法:

首先，我在我的自定义条目中添加了Action，当我按下搜索"按钮时将调用它.

First I added an Action to my custom entry to be called when I press my "search"-button.

MyEntry.cs

MyEntry.cs

namespace CustomEntry
{
    public class MyEntry:Entry
    {
        public Action SearchPressed = delegate {
        };
    }
}

第二，我像这样监听" ImeAction.Search并调用添加到自定义条目中的Action.

Second I "listen" for ImeAction.Search like this and call the Action I added to my custom entry.

MyEntryRenderer.cs(Android):

MyEntryRenderer.cs (Android):

[assembly: ExportRenderer(typeof(MyEntry), typeof(MyEntryRenderer))]
namespace CustomEntry.Android
{
    public class MyEntryRenderer:EntryRenderer
    {

        protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
        {
            base.OnElementChanged(e);

            if (Control != null) {
                Control.ImeOptions = ImeAction.Search;
                Control.EditorAction += (sender, args) => {
                    if (args.ActionId == ImeAction.Search) {
                        var entry = (AddressEntry)Element;
                        entry.SearchPressed();
                    }
                };
            }
        }

    }
}

在使用MyEntry的第三类中，当按下搜索"按钮时，我可以运行一些代码:

In a third class where I use MyEntry I can run some code when the "search"-button is pressed like this:

var myEntry = new MyEntry();
myEntry.SearchPressed += SomeMethod;

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