Xamarin Shell.BackgroundColor错误

在我的AppShell中，我正在设置外壳的背景色，如下所示：

<Setter Property="Shell.BackgroundColor" Value="#0075BE" />

但是，当应用程序在iOS模拟器中运行时，标题栏的背景色实际上是

#2588C6

（我用颜色选择器检查过）。 在Android仿真器中，颜色更接近

#0073C1

，但仍然不正确

如何使标题栏成为我指定的实际颜色？

您可以尝试使用

IOS:

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

[assembly: ExportRenderer(typeof(Xaminals.AppShell), typeof(Xaminals.iOS.MyShellRenderer))]
namespace Xaminals.iOS
{
    public class MyShellRenderer : ShellRenderer
    {
        protected override IShellSectionRenderer CreateShellSectionRenderer(ShellSection shellSection)
        {
            var renderer = base.CreateShellSectionRenderer(shellSection);
            if (renderer != null)
            {
                (renderer as ShellSectionRenderer).NavigationBar.BackgroundColor = UIColor.Red;
                (renderer as ShellSectionRenderer).NavigationBar.SetBackgroundImage(new UIImage(), UIBarMetrics.Default);
            }
            return renderer;
        }
    }
}

using Android.Content;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;

[assembly: ExportRenderer(typeof(Xaminals.AppShell), typeof(Xaminals.Droid.MyShellRenderer))]
namespace Xaminals.Droid
{
    public class MyShellRenderer : ShellRenderer
    {
        public MyShellRenderer(Context context) : base(context)
        {
        }

        protected override IShellToolbarAppearanceTracker CreateToolbarAppearanceTracker()
        {
            return new MyShellToolbarAppearanceTracker(this);
        }
    }

    public class MyShellToolbarAppearanceTracker : ShellToolbarAppearanceTracker
    {
        public MyShellToolbarAppearanceTracker(IShellContext context) : base(context)
        {
        }

        public override void SetAppearance(Toolbar toolbar, IShellToolbarTracker toolbarTracker, ShellAppearance appearance)
        {
            base.SetAppearance(toolbar, toolbarTracker, appearance);
            toolbar.SetBackgroundColor(Android.Graphics.Color.ParseColor("#0075BE"));
        }
    }

}

Android:

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

[assembly: ExportRenderer(typeof(Xaminals.AppShell), typeof(Xaminals.iOS.MyShellRenderer))]
namespace Xaminals.iOS
{
    public class MyShellRenderer : ShellRenderer
    {
        protected override IShellSectionRenderer CreateShellSectionRenderer(ShellSection shellSection)
        {
            var renderer = base.CreateShellSectionRenderer(shellSection);
            if (renderer != null)
            {
                (renderer as ShellSectionRenderer).NavigationBar.BackgroundColor = UIColor.Red;
                (renderer as ShellSectionRenderer).NavigationBar.SetBackgroundImage(new UIImage(), UIBarMetrics.Default);
            }
            return renderer;
        }
    }
}

using Android.Content;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;

[assembly: ExportRenderer(typeof(Xaminals.AppShell), typeof(Xaminals.Droid.MyShellRenderer))]
namespace Xaminals.Droid
{
    public class MyShellRenderer : ShellRenderer
    {
        public MyShellRenderer(Context context) : base(context)
        {
        }

        protected override IShellToolbarAppearanceTracker CreateToolbarAppearanceTracker()
        {
            return new MyShellToolbarAppearanceTracker(this);
        }
    }

    public class MyShellToolbarAppearanceTracker : ShellToolbarAppearanceTracker
    {
        public MyShellToolbarAppearanceTracker(IShellContext context) : base(context)
        {
        }

        public override void SetAppearance(Toolbar toolbar, IShellToolbarTracker toolbarTracker, ShellAppearance appearance)
        {
            base.SetAppearance(toolbar, toolbarTracker, appearance);
            toolbar.SetBackgroundColor(Android.Graphics.Color.ParseColor("#0075BE"));
        }
    }

}

---

只需在AppDelegate.cs中添加这一行

UINavigationBar.Appearance.Translucent = false;

---

请看可能的副本，这就是解决方案，谢谢弗朗西斯。谢谢。iOS版本出现错误：

命名空间“Xaminals”中不存在类型或命名空间名称“AppShell”（是否缺少程序集引用？

。？@danwellman Okey，

AppShell

是从

Xamarin.Forms.Shell

继承的我的project.cs文件，替换为你的.cs文件名。当我问这个问题时，我实际上不再从事我正在从事的项目，但如果内存可用，这就是解决方案