Gradient Button in Xamarin Forms


<a href="https://i.stack.imgur.com/WH328.png" rel="nofollow"><img alt="Gradient Button" class="b-lazy" data-src="https://i.stack.imgur.com/WH328.png" data-original="https://i.stack.imgur.com/WH328.png" src="https://etrip.eimg.top/images/2019/05/07/timg.gif" /></a>

How do I create this button with Gradient Effect in Xamarin Forms using Renderer ?


In xamarin you can't add gradient colors as a built in feature. You have to create a different rendering feature. This <a href="https://baglabs.com/2017/07/14/creating-gradients-xamarin-forms/" rel="nofollow">link</a> will guide you.


In Xamarin Forms Craets

public class GradientColorStack:StackLayout { public Color StartColor { get; set; } public Color EndColor { get; set; } }

And then Renderer Android

public class GradientColorStackRenderer : VisualElementRenderer<StackLayout> { private Color StartColor { get; set; } private Color EndColor { get; set; } protected override void DispatchDraw(global::Android.Graphics.Canvas canvas) { #region for Horizontal Gradient var gradient = new Android.Graphics.LinearGradient(0, 0, Width, 0, #endregion this.StartColor.ToAndroid(), this.EndColor.ToAndroid(), Android.Graphics.Shader.TileMode.Mirror); var paint = new Android.Graphics.Paint() { Dither = true, }; paint.SetShader(gradient); canvas.DrawPaint(paint); base.DispatchDraw(canvas); } protected override void OnElementChanged(ElementChangedEventArgs<Frame> e) { base.OnElementChanged(e); if (e.OldElement != null || Element == null) { return; } try { var stack = e.NewElement as GradientColorStack; this.StartColor = stack.StartColor; this.EndColor = stack.EndColor; } catch (Exception ex) { System.Diagnostics.Debug.WriteLine(@"ERROR:", ex.Message); } } }

And In Ios Project Rendering

public class GradientColorStackRenderer : VisualElementRenderer<Frame> { public override void Draw(CGRect rect) { base.Draw(rect); GradientColorFrame stack = (GradientColorStack)this.Element; CGColor startColor = stack.StartColor.ToCGColor(); CGColor endColor = stack.EndColor.ToCGColor(); #region for Vertical Gradient var gradientLayer = new CAGradientLayer(); #endregion gradientLayer.Frame = rect; gradientLayer.Colors = new CGColor[] { startColor, endColor }; NativeView.Layer.InsertSublayer(gradientLayer, 0); } }

Now you can Use in PCL Project Like this

<local:GradientColorStack StartColor="#DF596C" EndColor="#FFB239" > </local:GradientColorStack>


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