如何在IOS Xamarin.Forms中更改浮动TextField默认占位符颜色

using Xamarin.Forms;

namespace YourNamespace
{
    public class CustomTextField : Entry
    {
        public static readonly BindableProperty PlaceholderColorProperty =
            BindableProperty.Create(nameof(PlaceholderColor), typeof(Color), typeof(CustomTextField), Color.Default);

        public Color PlaceholderColor
        {
            get { return (Color)GetValue(PlaceholderColorProperty); }
            set { SetValue(PlaceholderColorProperty, value); }
        }
    }
}

using YourNamespace;
using YourNamespace.iOS;
using UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

[assembly: ExportRenderer(typeof(CustomTextField), typeof(CustomTextFieldRenderer))]
namespace YourNamespace.iOS
{
    public class CustomTextFieldRenderer : EntryRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
        {
            base.OnElementChanged(e);

            if (Control != null && e.NewElement != null)
            {
                var customTextField = (CustomTextField)e.NewElement;
                Control.AttributedPlaceholder = new NSAttributedString(Control.Placeholder ?? "", 
                    new UIStringAttributes { ForegroundColor = customTextField.PlaceholderColor.ToUIColor() });
            }
        }
    }
}

<StackLayout>
    <local:CustomTextField Placeholder="Enter your name" PlaceholderColor="Red" />
</StackLayout>