直接上代码：
1 using Android.Graphics;
2 using Android.Widget;
3 using DCMS.Client.Droid.Renderer;
4 using Xamarin.Forms;
5 using Xamarin.Forms.Platform.Android;
6
7 [assembly: ExportRenderer(typeof(Xamarin.Forms.Switch), typeof(CustomSwitchRenderer))]
8 namespace DCMS.Client.Droid.Renderer
9 {
10 public class CustomSwitchRenderer : SwitchRenderer
11 {
12 private Xamarin.Forms.Switch view;
13
14 public CustomSwitchRenderer(Android.Content.Context context) : base(context) { }
15
16 protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Switch> e)
17 {
18 //this.Element.Toggled += this.OnElementToggled;
19
20 base.OnElementChanged(e);
21 if (e.OldElement != null || e.NewElement == null)
22 return;
23
24 //if (e.OldElement != null)
25 // e.OldElement.Toggled -= OnElementToggled;
26
27 //e.NewElement.Toggled += OnElementToggled;
28
29 view = (Xamarin.Forms.Switch)Element;
30 if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.JellyBean)
31 {
32 if (Control != null)
33 {
34 if (this.Control.Checked)
35 {
36 this.Control.TrackDrawable.SetColorFilter(Xamarin.Forms.Color.FromHex("#6decacec").ToAndroid(), PorterDuff.Mode.SrcAtop);
37 }
38 else
39 {
40 this.Control.TrackDrawable.SetColorFilter(Xamarin.Forms.Color.FromHex("#6db3b1b3").ToAndroid(), PorterDuff.Mode.SrcAtop);
41 }
42 this.Control.CheckedChange += this.OnCheckedChange;
43 Control.SetTrackResource(Resource.Drawable.track);
44 }
45 }
46 }
47
48 private void OnCheckedChange(object sender, CompoundButton.CheckedChangeEventArgs e)
49 {
50 if (this.Control.Checked)
51 {
52 this.Control.TrackDrawable.SetColorFilter(Xamarin.Forms.Color.FromHex("#6decacec").ToAndroid(), PorterDuff.Mode.SrcAtop);
53 }
54 else
55 {
56 this.Control.TrackDrawable.SetColorFilter(Xamarin.Forms.Color.FromHex("#6db3b1b3").ToAndroid(), PorterDuff.Mode.SrcAtop);
57 }
58 Element.IsToggled = Control.Checked;
59 }
60
61 protected override void dispose(bool disposing)
62 {
63 this.Control.CheckedChange -= this.OnCheckedChange;
64 base.dispose(disposing);
65 }
66
67 }
68 }
效果如下：
