我尝试在 iOS 中添加徽章。我能够添加成功。有人可以在android 上帮忙吗?请注意,我不想使用 shell 导航。
public class CustomTabbedPageHandler : Microsoft.Maui.Controls.Handlers.Compatibility.TabbedRenderer
{
public void UpdateTabBadges()
{
if (Element is MainTabbedPage customTabbedPage)
{
// Ensure that ViewController is not null
if (ViewController is UITabBarController tabBar && tabBar.TabBar != null)
{
for (int i = 0; i < customTabbedPage.Children.Count; i++)
{
var badgeCount = customTabbedPage.GetBadgeCount(i);
AddBadgeToTab(i, badgeCount);
}
}
}
}
public void AddBadgeToTab(int tabIndex, int count)
{
if (ViewController is UITabBarController tabBar)
{
try
{
// Check if the tabBar has items and if the tabIndex is valid
if (tabBar.TabBar.Items != null && tabBar.TabBar.Items.Length > tabIndex)
{
// Set the badge value
tabBar.TabBar.Items[tabIndex].BadgeValue = count > 0 ? count.ToString() : null;
}
}
catch (Exception ex)
{
// Optionally log the exception or handle it as needed
Console.WriteLine($"Error adding badge: {ex.Message}");
}
}
}
}
这里适用于安卓。但获取 tablayout 总是为空。
public class CustomTabbedPageHandler : TabbedViewHandler
{
public override void UpdateValue(string property)
{
base.UpdateValue(property);
var tabs = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity?.FindViewById<FragmentContainerView>(Microsoft.Maui.Resource.Id
.navigationlayout_bottomtabs);
var tabLayout = tabs?.GetChildAt(0);
if (tabLayout is TabLayout layout)
{
====//===
}
}
}
不确定,我如何访问选项卡布局并在那里添加徽章。
可以使用平台原生代码进行修改。
从TabbedPage.Android.cs的源码中,我们可以先获取
TabbedPageManager
的实例,而从TabbedPageManager的源码中,我们可以使用Reflection
来获取TabbedPageManager
(因为它是内部类)和 TabLayout
。
然后我们可以在
OnHandlerChanged()
上重写方法 TabbedPage
。
请参考以下代码:
protected override void OnHandlerChanged()
{
base.OnHandlerChanged();
#if ANDROID
FieldInfo tabbedPageManagerFieldInfo = typeof(TabbedPage).GetField("_tabbedPageManager", BindingFlags.NonPublic | BindingFlags.Instance);
object tabbedPageManager = tabbedPageManagerFieldInfo?.GetValue(this);
FieldInfo tabLayoutFieldInfo = tabbedPageManager?.GetType().GetField("_tabLayout", BindingFlags.NonPublic | BindingFlags.Instance);
var tablayout = tabLayoutFieldInfo?.GetValue(tabbedPageManager) as Google.Android.Material.Tabs.TabLayout;
if (tablayout != null)
{
for (int i = 0; i < tablayout.TabCount; i++)
{
tablayout.GetTabAt(i).OrCreateBadge.Number = 10;
//tablayout.GetTabAt(i).OrCreateBadge.BackgroundColor = Resource.Color.blue;
//tablayout.GetTabAt(i).OrCreateBadge.BadgeTextColor = Resource.Color.white;
}
}
#endif
}