问题描述
如何在Xamarin Forms的Editor
中设置Placeholder Text和Placeholder Color.
它没有默认的功能或属性,如何自定义?
It has no default Functionality or Properties how to customize it?
参考文档: Xamarin 表单编辑器
推荐答案
为此你需要一个自定义渲染器(这里是 Android 自定义渲染器)你需要另一个适用于 iOS 的渲染器:
You will need a custom renderer for that (Here is the Android Custom Renderer) you will need another renderer for iOS:
public class PlaceholderEditor : Editor
{
public static readonly BindableProperty PlaceholderProperty =
BindableProperty.Create<PlaceholderEditor, string>(view => view.Placeholder, String.Empty);
public PlaceholderEditor()
{
}
public string Placeholder
{
get
{
return (string)GetValue(PlaceholderProperty);
}
set
{
SetValue(PlaceholderProperty, value);
}
}
}
public class PlaceholderEditorRenderer : EditorRenderer
{
public PlaceholderEditorRenderer()
{
}
protected override void OnElementChanged(
ElementChangedEventArgs<Editor> e)
{
base.OnElementChanged(e);
if (e.NewElement != null)
{
var element = e.NewElement as PlaceholderEditor;
this.Control.Hint = element.Placeholder;
}
}
protected override void OnElementPropertyChanged(
object sender,
PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == PlaceholderEditor.PlaceholderProperty.PropertyName)
{
var element = this.Element as PlaceholderEditor;
this.Control.Hint = element.Placeholder;
}
}
}
对于颜色,您可能需要这样的东西(Android):
And for the color you may need something like this (Android):
Control.SetHintTextColor(Android.Graphics.Color.White);
在 Xamarin 论坛中已经有一个线程:https://forums.xamarin.com/discussion/20616/placeholder-editor
There already a thread for this in the Xamarin Forums:https://forums.xamarin.com/discussion/20616/placeholder-editor
有关自定义渲染器的更多信息如下:https://developer.xamarin.com/guides/xamarin-forms/custom-渲染器/
And more about Custom Renderers information below:https://developer.xamarin.com/guides/xamarin-forms/custom-renderer/
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