Xamrin.Forms输入单元格如何更改占位符的字体大小 [英] Xamrin.Forms Entry Cell How to change font size for Placeholder

问题描述

我在想是否可以更改EntryCell上的占位符的字体大小而不更改fontSize上的文本的fontSize吗?

I am thinking if i can change font size for placeholder on EntryCell without change fontSize for Text on EntryCell?

是否可以更改占位符的字体大小而无需更改文本的字体大小

Is There away to change font size for Placeholder without change font size for Text

 Code = new EntryCell { Label = "Code:*", Text = "", Keyboard = Keyboard.Default, Placeholder = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" };

推荐答案

这是针对Android的自定义渲染器.在这里，我正在修改HintTextColor(placeholder).您可以用类似的方式修改字体.

Here is a custom renderer for android. Here I'm modifying the HintTextColor(placeholder). You can modify the font in a similar way.

  using System;
using Xamarin.Forms.Platform.Android;
using Xamarin.Forms;
using communityhealth;
using Android.Graphics;
using communityhealth.Android;


[assembly: ExportRenderer (typeof (MyUsernameEntry), typeof (MyUsernameEntryRenderer))]
[assembly: ExportRenderer (typeof (MyPasswordEntry), typeof (MyPasswordEntryRenderer))]
[assembly: ExportRenderer (typeof (MyEntry), typeof (MyEntryRenderer))]

namespace communityhealth.Android
{
    public class MyEntryRenderer : EntryRenderer
    {
        protected override void OnElementChanged (ElementChangedEventArgs<Entry> e)
        {
            base.OnElementChanged (e);
            if (e.OldElement == null) {   // perform initial setup
                // lets get a reference to the native control
                var nativeEditText = (global::Android.Widget.EditText) Control;
                // do whatever you want to the textField here!
                nativeEditText.SetBackgroundColor(global::Android.Graphics.Color.Transparent);
                nativeEditText.SetTextColor(global::Android.Graphics.Color.White);
                Typeface font = Typeface.CreateFromAsset (Forms.Context.Assets, "Neris-Light.otf");
                nativeEditText.TextSize = 14f;
                nativeEditText.Typeface = font;
            }
        }
    }

    public class MyUsernameEntryRenderer : MyEntryRenderer
    {
        protected override void OnElementChanged (ElementChangedEventArgs<Entry> e)
        {
            base.OnElementChanged (e);

            if (e.OldElement == null) {
                // lets get a reference to the native control
                var nativeEditText = (global::Android.Widget.EditText) Control;
                nativeEditText.Hint = "Username";
                nativeEditText.SetHintTextColor (global::Android.Graphics.Color.White);
                nativeEditText.TextSize = 18f;
            }
        }
    }

    public class MyPasswordEntryRenderer : MyEntryRenderer
    {
        protected override void OnElementChanged (ElementChangedEventArgs<Entry> e)
        {
            base.OnElementChanged (e);

            if (e.OldElement == null) {
                // lets get a reference to the native control
                var nativeEditText = (global::Android.Widget.EditText) Control;
                nativeEditText.Hint = "Password";
                nativeEditText.SetHintTextColor (global::Android.Graphics.Color.White);
                nativeEditText.TextSize = 18f;
            }
        }
    }
}

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