Xamarin Forms：如何向按钮添加填充？

我有以下 XAML Xamarin.Forms.Button

<Button Text="Cancel" BackgroundColor="#3079a8" TextColor="White" />

我尝试通过 Padding 属性向其添加填充，但这不起作用。检查论坛和文档后，我意识到 Xamarin.Forms.Button 的文档中没有 padding 属性（链接到文档） http://docs.go-mono.com/?link=T%3AXamarin.Forms.Button%2F*，是否有其他类型的快速修复方法可以为按钮添加更多的填充？代码示例将不胜感激。

usage:

<controls:EnhancedButton Padding="1,2,3,4"/>

优点：

• 没有令人讨厌的副作用
• 对齐没有问题
• 无观树丑
• 无视图深度增量

ios:

[assembly: ExportRenderer(typeof(EnhancedButton), typeof(EnhancedButtonRenderer))]
namespace YOURNAMESPACE.iOS
{
    public class EnhancedButtonRenderer : ButtonRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<Button> e)
        {
            base.OnElementChanged(e);
            UpdatePadding();
        }

        private void UpdatePadding()
        {
            var element = this.Element as EnhancedButton;
            if (element != null)
            {
                this.Control.ContentEdgeInsets = new UIEdgeInsets(

                    (int)element.Padding.Top,
                    (int)element.Padding.Left,
                    (int)element.Padding.Bottom,
                    (int)element.Padding.Right
                );
            }
        }

        protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            base.OnElementPropertyChanged(sender, e);
            if (e.PropertyName == nameof(EnhancedButton.Padding))
            {
                UpdatePadding();
            }
        }
    }
}

android:

[assembly: ExportRenderer(typeof(EnhancedButton), typeof(EnhancedButtonRenderer))]
namespace YOURNAMESPACE.Droid
{
    public class EnhancedButtonRenderer : ButtonRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<Button> e)
        {
            base.OnElementChanged(e);
            UpdatePadding();
        }

        private void UpdatePadding()
        {
            var element = this.Element as EnhancedButton;
            if (element != null)
            {
                this.Control.SetPadding(
                    (int)element.Padding.Left,
                    (int)element.Padding.Top,
                    (int)element.Padding.Right, 
                    (int)element.Padding.Bottom
                );
            }
        }

        protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            base.OnElementPropertyChanged(sender, e);
            if (e.PropertyName == nameof(EnhancedButton.Padding))
            {
                UpdatePadding();
            }
        }
    }
}

pcl:

public class EnhancedButton : Button
{
    #region Padding    

    public static BindableProperty PaddingProperty = BindableProperty.Create(nameof(Padding), typeof(Thickness), typeof(EnhancedButton), default(Thickness), defaultBindingMode:BindingMode.OneWay);

    public Thickness Padding
    {
        get { return (Thickness) GetValue(PaddingProperty); }
        set { SetValue(PaddingProperty, value); }
    }

    #endregion Padding
}

使用效果而不是渲染器的解决方案，以便轻松使用多个控件：

XAML:

<Label Text="Welcome to Xamarin.Forms!" BackgroundColor="Red">
    <Label.Effects>
        <xamTest:PaddingEffect Padding="20,40,20,40"></xamTest:PaddingEffect>
    </Label.Effects>
</Label>

PCL:

[assembly: ResolutionGroupName("ComponentName")]
namespace XamTest
{
    public class PaddingEffect : RoutingEffect
    {
        /// <inheritdoc />
        protected PaddingEffect(string effectId) : base($"ComponentName.{nameof(PaddingEffect)}")
        {
        }

        public Thickness Padding { get; set; }
    }
}

Android:

[assembly: ResolutionGroupName("ComponentName")]
[assembly: ExportEffect(typeof(XamTest.Droid.PaddingEffect), "PaddingEffect")]
namespace XamTest.Droid
{
    public class PaddingEffect : PlatformEffect
    {
        /// <inheritdoc />
        protected override void OnAttached()
        {
            if (this.Control != null)
            {
                var firstMatch = this.Element.Effects.FirstOrDefault(d => d is XamTest.PaddingEffect);
                if (firstMatch is XamTest.PaddingEffect effect)
                {
                    this.Control.SetPadding((int)effect.Padding.Left, (int)effect.Padding.Top, (int)effect.Padding.Right, (int)effect.Padding.Bottom);
                }
            }
        }

        /// <inheritdoc />
        protected override void OnDetached()
        {
        }
    }
}