Rounded corner for Entry - Xamarin forms UWP

问题

Is there anything possible to customize the radius of Entry to having a slightly rounded corner?

回答1:

You can use Custom Renderer in xamarin.forms

in iOS

//...
using App11;
using App11.iOS;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

[assembly: ExportRenderer(typeof(MyEntry), typeof(MyiOSEntry))]
namespace App11.iOS
{
  public class MyiOSEntry:EntryRenderer
  {
    protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
    {
        base.OnElementChanged(e);

        if (Control != null)
        {
            Control.Layer.MasksToBounds = true;
            Control.Layer.CornerRadius = 10;  //set the rounded corner
            Control.Layer.BorderColor = UIColor.Red.CGColor;
            Control.Layer.BorderWidth = 3;
        }
    }
 }
}

in Android

creat a xml file in the folder Resource->drawable edit_text_style.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
 <item>
   <shape
     android:shape="rectangle">
    <solid
      android:color="#ffffff" />
    <corners
      android:radius="10dp" />
    <stroke
      android:width="2dp"
      android:color="#3bbdfa" />
   </shape>
</item>

in Custom Renderer

using Android.Support.V4.Content.Res;
using App11;
using App11.Droid;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;

[assembly: ExportRenderer(typeof(MyEntry), typeof(MyAndriodEntry))]
namespace App11.Droid
{
 public class MyAndriodEntry:EntryRenderer
 {
   public MyAndriodEntry(Context context):base(context)
    {

    }

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

        if(Control!=null)
        {
            Control.SetBackground(ResourcesCompat.GetDrawable(Resources, Resource.Drawable.edit_text_style, null) );
        }

    }
  }
}

in UWP

create a folder named Styles and add a new item as type Resource Dictionary and name it Dictionary1.xaml in Dictionary1.xaml put this code for a rounded Textbox .

in Custom Renderer

using App11;
using App11.UWP;
using Windows.UI.Xaml.Controls;
using Xamarin.Forms;
using Xamarin.Forms.Platform.UWP;

[assembly: ExportRenderer(typeof(MyEntry), typeof(MyUWPEntry))]
namespace App11.UWP
{
  public class MyUWPEntry:EntryRenderer
  {

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

        if(Control!=null)
        {
           Control.Style = (Windows.UI.Xaml.Style)App11.UWP.App.Current.Resources["StyleRoundedTextBox"];
        }

    }
  }
}

how do I changed this style and how do I create this code ? It's simple , in msdn.com search for "objectName" default style in uwp then you will find default style for the object you need . change it in the way you want and add it to application resources directly or link it (like what I did here) then load your style in CustomRenderer

for more detail about UWP yo can refer here

in Forms

using System;
using System.Collections.Generic;
using System.Text;
using Xamarin.Forms;

namespace App11
{
 public class MyEntry : Entry
 {
    public MyEntry()
    {

    }
 }
}

in xxx.cs file

Content = new StackLayout
 {
    Children = {
                 new MyEntry {Text = "In Shared Code",}
                },
    VerticalOptions = LayoutOptions.CenterAndExpand,
    HorizontalOptions = LayoutOptions.CenterAndExpand,
 };

回答2:

For Windows app you can customize an entry using a renderer.

public class CustomEntryRenderer : ViewRenderer<CustomEntry, TextBox>
{
    protected override void OnElementChanged(ElementChangedEventArgs<CustomEntry> e)
    {
        base.OnElementChanged(e);
        var textBox = new TextBox();
        textBox.BorderThickness = new Windows.UI.Xaml.Thickness(1);
        textBox.BorderBrush = new SolidColorBrush(GetSolidColorBrush("#444444").Color);
        textBox.CornerRadius = new Windows.UI.Xaml.CornerRadius(10);
        this.SetNativeControl(textBox);
    }
    public SolidColorBrush GetSolidColorBrush(string hex)
    {
        hex = hex.Replace("#", string.Empty);
        byte r = (byte)(Convert.ToUInt32(hex.Substring(0, 2), 16));
        byte g = (byte)(Convert.ToUInt32(hex.Substring(2, 2), 16));
        byte b = (byte)(Convert.ToUInt32(hex.Substring(4, 2), 16));

        SolidColorBrush myBrush = new SolidColorBrush(Windows.UI.Color.FromArgb(255, r, g, b));
        return myBrush;
    }
}

来源：https://stackoverflow.com/questions/52972394/rounded-corner-for-entry-xamarin-forms-uwp