MAUI中iOS平台ToolbarHandler追加映射未触发问题

架构老林

2026-7-14

MAUI中iOS平台ToolbarHandler自定义映射不触发问题

我需要自定义Android和iOS平台的Toolbar，因此弃用了旧渲染器，为ToolbarHandler追加映射：

Android平台（Platforms.Android.MainApplication.cs）代码正常执行

[Application]
public class MainApplication : MauiApplication
{
    public MainApplication(IntPtr handle, JniHandleOwnership ownership)
        : base(handle, ownership)
    {
    }

    protected override MauiApp CreateMauiApp() {

        ToolbarHandler.Mapper.AppendToMapping("CustomToolbarMapper", (handler, toolbar) =>
        {
            var materialToolbar = handler.PlatformView;
            materialToolbar.ContentInsetStartWithNavigation = 0;
            materialToolbar.TitleCentered = true;
        });

        return MauiProgram.CreateMauiApp();
    }
}

iOS平台（Platforms.iOS.AppDelegate.cs）追加的映射动作未触发

[Register("AppDelegate")]
public class AppDelegate : MauiUIApplicationDelegate
{
    protected override MauiApp CreateMauiApp() {

        System.Diagnostics.Debug.WriteLine("IN CREATE MAUI APP iOS");

        ToolbarHandler.Mapper.AppendToMapping("CustomToolbarMapper2", (handler, toolbar) =>
        {
            // 从未执行到此处！
            System.Diagnostics.Debug.WriteLine("IN TOOLBAR HANDLER");
        });

        return MauiProgram.CreateMauiApp();
    }
}