如何在Xamarin.Forms中更改输入的边框颜色
问题描述:
我正在Xamarin.forms跨平台中编写应用程序. 该应用程序中的条目很少,我想将边框颜色创建/更改为红色. 有没有简单的方法可以做到这一点?或是否存在任何方式?
I'm writing an app in Xamarin.forms cross-platform. There are few Entries in The app and I want to create/change border color to red. Is There any easy way to do this? or Does any way exists?
答
我认为您只能使用CustomRenderer来实现:
I think you can only achieve this with a CustomRenderer:
iOS:
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
Control.Layer.BorderColor = UIColor.Red.CGColor;
Control.Layer.BorderWidth = 1;
}
在Android上,我认为没有CustomRender是不可能的(实际上,如果是...我不知道〜对不起):
On Android, I think it's not possible without a CustomRender (Actually, if it is... I don't know how ~ Sorry):
使用CustomRenderer就像这样:
Using the CustomRenderer would be something like this:
[assembly: ExportRenderer(typeof(Entry), typeof(SuperEntryRenderer))]
namespace Bla{
public class SuperEntryRenderer : EntryRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
{
base.OnElementChanged(e);
if (e.OldElement == null)
{
var nativeEditText = (global::Android.Widget.EditText)Control;
var shape = new ShapeDrawable(new Android.Graphics.Drawables.Shapes.RectShape());
shape.Paint.Color = Xamarin.Forms.Color.Red.ToAndroid();
shape.Paint.SetStyle(Paint.Style.Stroke);
nativeEditText.Background = shape;
}
}
}