更改主详细信息导航 xamarin 表单中的汉堡包图标 [英] Change hamburger icon in master detail navigation xamarin forms

问题描述

我正在处理 Xamarin 表单，我需要在成功登录屏幕后显示主详细信息导航.我想更改默认的汉堡包图标，但无法更改.

I am working on Xamarin forms where I need to show master detail navigation after successful login screen. I want to change default hamburger icon but not able to change it.

请看下面我使用的代码.

Please see below code I am using.

由于我的应用程序有登录屏幕，所以我不想在登录屏幕上显示任何导航.我只是在 app.xaml.cs

Since my app have login screen so I don't want to show any navigation on Login screen. I am just setting main page in app.xaml.cs

public App()
{
    InitializeComponent();

    MainPage = new Login();
}

现在点击登录后我尝试了以下方法来更改图标但没有用

Now after login clicked I tried following approach to change icon but didn't work

var dashboard = new Dashboard(){Icon = "Menuicon.png" };
Application.Current.MainPage = dashboard;

Dashbaord 是 masterdetail 页面，在其 ctor 上，我正在设置如下所示的详细信息页面

Dashbaord is masterdetail page and on its ctor, I am setting detail page like below

Detail = new NavigationPage((Page)Activator.CreateInstance(typeof(DashbaordDetail))) { Icon = "Menuicon.png" };

它没有反映新图标

推荐答案

您应该使用自定义渲染器.

You should use a custom renderer.

在您的 Android 项目中，如下所示:

In your Android project, like this:

[assembly: ExportRenderer(typeof(CustomIcon.Views.MainPage), typeof(IconNavigationPageRenderer))]
namespace CustomIcon.Droid
{
    public class IconNavigationPageRenderer : MasterDetailPageRenderer
    {
        private static Android.Support.V7.Widget.Toolbar GetToolbar() => (CrossCurrentActivity.Current?.Activity as MainActivity)?.FindViewById<Android.Support.V7.Widget.Toolbar>(Resource.Id.toolbar);

        protected override void OnLayout(bool changed, int l, int t, int r, int b)
        {
            base.OnLayout(changed, l, t, r, b);
            var toolbar = GetToolbar();
            if (toolbar != null)
            {
                for (var i = 0; i < toolbar.ChildCount; i++)
                {
                    var imageButton = toolbar.GetChildAt(i) as ImageButton;

                    var drawerArrow = imageButton?.Drawable as DrawerArrowDrawable; 
                    if (drawerArrow == null)
                        continue;

                    imageButton.SetImageDrawable(Forms.Context.GetDrawable(Resource.Drawable.newIcon));
                }
            }
        }
    }
}

在您的 iOS 项目中，仅使用与您的 PCL 项目中的 xaml 文件相同的图标，如下所示:

In your iOS project only use the same icon from you xaml file in your PCL project, like this:

<?xml version="1.0" encoding="utf-8" ?>
<MasterDetailPage  xmlns="http://xamarin.com/schemas/2014/forms"
         xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
         xmlns:local="clr-namespace:CustomIcon.Views;assembly=CustomIcon"
         Title="MainPage"
         Icon="newIcon.png"
         x:Class="CustomIcon.Views.MainPage">
<MasterDetailPage.Master>
    <local:MasterPage x:Name="masterPage" />
</MasterDetailPage.Master>
<MasterDetailPage.Detail>
    <NavigationPage>
        <x:Arguments>
            <local:Page1 />
        </x:Arguments>
    </NavigationPage>
</MasterDetailPage.Detail>

有关更多信息，请参阅我在 github 上的存储库:https://github.com/wilsonvargas/CustomIconNavigationPage

For more information see my repo on github: https://github.com/wilsonvargas/CustomIconNavigationPage

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