Question

我有一个问题，我无法解决。也许你可以帮助我。我想为xamarin表单中的条目设置灵活的下划线。当我将customEntry的BackgroundColor设置为透明时，下划线消失，但我无法带来＆＃34;它回来了。我已经尝试过一些东西，比如设置新的边界，这些东西不适用于底部或设置新的BackgroundColor。谷歌也无法帮助我。你有什么想法可以解决这个问题吗？

谢谢

我的PCL

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace MultiBaseCS_Mobile
{
    public class CustomEntryCell : Entry
    {

        public static readonly  BindableProperty HasUnderlineProperty =
            BindableProperty.Create(nameof(HasUnderline), typeof(bool), typeof(CustomEntryCell), true);

        public CustomEntryCell()
        {
        }

        public bool HasUnderline
        {
            get { return (bool)GetValue(HasUnderlineProperty); }
            set { SetValue(HasUnderlineProperty, value); }
        }

    }
}

我的customRenderer

using Xamarin.Forms;
using MultiBaseCS_Mobile;
using MultiBaseCS_Mobile.Droid;
using Xamarin.Forms.Platform.Android;
using Android.Text;
using System.ComponentModel;
using Android.Graphics.Drawables;
using Android.Graphics;

[assembly: ExportRenderer(typeof(CustomEntryCell), typeof(CustomEntryRenderer))]

namespace MultiBaseCS_Mobile.Droid
{
    public class CustomEntryRenderer : EntryRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
        {
            base.OnElementChanged(e);

            var entry = (CustomEntryCell)Element;

            if (entry != null)
            {
                if (!entry.HasUnderline)
                {
                    Control.SetBackgroundColor(Android.Graphics.Color.Argb(0, 0, 0, 0));
                }

            }
        }



        protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            base.OnElementPropertyChanged(sender, e);
            var entry = (CustomEntryCell)Element;

            if (e.PropertyName == CustomEntryCell.HasUnderlineProperty.PropertyName)
            {
                if (!entry.HasUnderline)
                {
                    Control.SetBackgroundColor(Android.Graphics.Color.Argb(0, 0, 0, 0));
                }
                else
                {
                    // Underline should appear
                }


            }
        }
    }
}

Answer 1

以下是您可以尝试的内容

using Xamarin.Forms;
using MultiBaseCS_Mobile;
using MultiBaseCS_Mobile.Droid;
using Xamarin.Forms.Platform.Android;
using Android.Text;
using System.ComponentModel;
using Android.Graphics.Drawables;
using Android.Graphics;

[assembly: ExportRenderer(typeof(CustomEntryCell), typeof(CustomEntryRenderer))]

namespace MultiBaseCS_Mobile.Droid
{
    public class CustomEntryRenderer : EntryRenderer
    {
        InsetDrawable originalBackgroundDrawable = null;

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

            originalBackgroundDrawable = Control.Background as InsetDrawable;

            var entry = (CustomEntryCell)Element;    
            if (entry != null)
            {
                if (!entry.HasUnderline)
                {
                    Control.SetBackground(null);
                }

            }
        }



        protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            base.OnElementPropertyChanged(sender, e);

            var entry = (CustomEntryCell)Element;    
            if (e.PropertyName == CustomEntryCell.HasUnderlineProperty.PropertyName)
            {
                if (!entry.HasUnderline)
                {
                    Control.SetBackgroundColor(null);
                }
                else
                {
                    // Underline should appear
                    Control.SetBackgroundColor(originalBackgroundDrawable);
                }


            }
        }
    }
}

再次强调服务条目

1 个答案: