android - 按钮的渐变背景 - 自定义渲染器

Question

我在为 Android 项目中具有渐变背景的按钮制作自定义渲染器时遇到问题。在 iOS 上我使用了这段代码:

public class CustomButtonRenderer : Xamarin.Forms.Platform.iOS.ButtonRenderer
    {
        public override void LayoutSubviews()
        {
            foreach (var layer in Control?.Layer.Sublayers.Where(layer => layer is CAGradientLayer))
                layer.Frame = Control.Bounds;
            base.LayoutSubviews();
        }

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

            if (e.OldElement == null)
            {
                var gradient = new CAGradientLayer();
                gradient.CornerRadius = Control.Layer.CornerRadius = 10;
                gradient.Colors = new CGColor[]
                {
                    UIColor.FromRGB(51, 102, 104).CGColor,
                    UIColor.FromRGB(51, 202, 204).CGColor
                };
                var layer = Control?.Layer.Sublayers.LastOrDefault();
                Control?.Layer.InsertSublayerBelow(gradient, layer);
            }
        }
    }

如何在 Android 中做同样的事情？

Answer 1

下面的链接可能对您有用

https://forums.xamarin.com/discussion/comment/279896#Comment_279896