如何在Xamarin.Forms中使用多个绑定属性初始化自定义控件？

Question

我需要将此标记转换为可重用的控件：

<Frame BackgroundColor = "{DynamicResource BaseColor}" Margin="50,2,50,2">
            <Frame.CornerRadius>
                <OnPlatform x:TypeArguments="x:Single" iOS="20" Android="25"/>
            </Frame.CornerRadius>
            <Controls:CustomLabel Text = "Login" HorizontalTextAlignment="Center" 
 TextColor="White"/>
            <Frame.GestureRecognizers>
                <TapGestureRecognizer Command = "{Binding LogIn}" CommandParameter="{Binding}" />
            </Frame.GestureRecognizers>
        </Frame>

初始描述：

public class CustomButton : ContentView
{
    StackLayout parentStack;

    public CustomButton()
    {
        #region Initializing control

        parentStack = new StackLayout();
        Label textLabel = new Label { BackgroundColor = BackgroundColor, TextColor = TextColor, Text = Text };
        Frame frame = new Frame { BackgroundColor = BackgroundColor, CornerRadius = CornerRadius, Content = textLabel };
        parentStack.Children.Add(frame);
        Content = parentStack; 
        #endregion
    }

    public static readonly BindableProperty CornerRadiusProperty =
        BindableProperty.Create(nameof(CornerRadius), typeof(float), typeof(CustomButton), defaultValue: default(float), propertyChanged:RadiusSet);

    private static void RadiusSet(BindableObject bindable, object oldValue, object newValue)
    {
        var @this = (CustomButton)bindable;
        @this.CornerRadius = (float)newValue;

    }

    public static readonly BindableProperty TextProperty =
        BindableProperty.Create(nameof(Text), typeof(string), typeof(CustomButton), defaultValue: default(string), propertyChanged: TextSet);

    private static void TextSet(BindableObject bindable, object oldValue, object newValue)
    {
        var @this = (CustomButton)bindable;
        @this.Text = (string)newValue;

    }

    public static readonly BindableProperty TextColorProperty =
        BindableProperty.Create(nameof(TextColor), typeof(Color), typeof(CustomButton), defaultValue: Color.Black, propertyChanged: TextColorSet);

    private static void TextColorSet(BindableObject bindable, object oldValue, object newValue)
    {
        var @this = (CustomButton)bindable;
        @this.TextColor = (Color)newValue;
    }

    public float CornerRadius
    {
        get { return (float)GetValue(CornerRadiusProperty); }
        set { SetValue(CornerRadiusProperty, value); }
    }

    public string Text
    {
        get { return (string)GetValue(TextProperty); }
        set { SetValue(TextProperty, value); }
    }

    public Color TextColor
    {
        get { return (Color)GetValue(TextColorProperty); }
        set { SetValue(TextColorProperty, value); }
    }

}

我所需要做的就是在解析控件时设置可绑定属性。但是显然构造函数不是正确的地方。我现在唯一想到的选择就是BP的propertyChanged，但是当它们的重要性相同时，哪个负责呢？