您是否尝试过Xamarin论坛链接here的代码。我没有亲自尝试过,但它看起来可以用来做你想做的事情,包括使用动态颜色。也许这样的事情(我写了一些从内存中的代码,所以让我知道,如果它不工作):
形式:
public class FancyButton : Button {
/// <summary>
/// The color pressed down color property.
/// </summary>
public static readonly BindableProperty PressedDownColorProperty = BindableProperty.Create(nameof(PressedDownColor), typeof(Color), typeof(FancyButton), default(Color));
/// <summary>
/// Gets or sets the pressed down color.
/// </summary>
/// <value>The color to change to when the button is pressed down string.</value>
public Color PressedDownColor {
get { return (Color)GetValue(PressedDownProperty); }
set { SetValue(PressedDownProperty, value); }
}
}
的Droid:
[assembly: ExportRenderer(typeof(App2.FancyButton), typeof(FancyButtonAndroid))]
namespace App2.Droid {
public class FancyButtonAndroid : ButtonRenderer {
private Color _pressedDownColor;
protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Button> e) {
base.OnElementChanged(e);
Android.Widget.Button thisButton = Control as Android.Widget.Button;
FancyButton formsButton = (FancyButton)Element;
_pressedDownColor = formsButton.PressedDownColor;
thisButton.Touch += (object sender, Android.Views.View.TouchEventArgs e2) => {
if (e2.Event.Action == MotionEventActions.Down) {
thisButton.SetBackgroundColor(_pressedDownColor.ToAndroid());
} else if (e2.Event.Action == MotionEventActions.Up) {
thisButton.SetBackgroundColor(Xamarin.Forms.Color.Default.ToAndroid());
}
};
}
/// <summary>
/// Raises the element property changed event.
/// </summary>
/// <param name="sender">Sender</param>
/// <param name="e">The event arguments</param>
protected override void OnElementPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e) {
base.OnElementPropertyChanged(sender, e);
FancyButton formsButton = Element as FancyButton;
if(formsButton != null && e.PropertyName == FancyButton.PlaceholderProperty.PropertyName) {
_pressedDownColor = formsButton.PressedDownColor;
}
}
}
}
哎呀,只是想出了你的意思是。还有一个问题,我的drawable可以是颜色而不是图像吗?如果我的按钮的颜色,我希望它成为当前页面的背景颜色......所以它是一种动态颜色?这是行不通的。谢谢! –
@Cheesebaron - 它看起来像你的答案是适用于Android的Xamarin,而不是Xamarin Forms。这是问题所要求的吗?如果是这样,我们需要删除Xamarin.Forms标签,当然? –
他有Android标签。因此Android的答案。他说他有一个自定义渲染器,因此他可以在自定义渲染器中使用此代码来获得所需的效果。 – Cheesebaron