Xamarin.Forms Android 底部导航栏 _Xamarin.Forms

怀抱观古今，寝食展戏谑。这篇文章主要讲述Xamarin.Forms Android 底部导航栏相关的知识，希望能为你提供帮助。
Xamarin.Forms android 底部导航栏在Android中常见设计底部导航栏，在Xamarin.Forms中如何实现该效果呢？
这里借助第三方框架来实现底部导航效果：
第三方库：Naxam.BottomTabbedPage
GitHub地址：https://github.com/naxam/bottomtabbedpage-xamarin-forms

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首先：创建MainTabAndroidPage继承于BottomTabbedPage

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1 using Naxam.Controls.Forms; 2 using System; 3 using System.Collections.Generic; 4 using System.Diagnostics; 5 using System.Linq; 6 using System.Text; 7 using System.Threading.Tasks; 8 9 using Xamarin.Forms; 10 using Xamarin.Forms.Xaml; 11 12 namespace XFPractice.Pages.MainTab 13 { 14[XamlCompilation(XamlCompilationOptions.Compile)] 15public partial class MainTabAndroidPage : BottomTabbedPage 16{ 17public MainTabAndroidPage() 18{ 19InitializeComponent(); 20NavigationPage.SetHasNavigationBar(this, true); 21NavigationPage.SetHasBackButton(this,false); 22InitTabPages(); 23 24this.Appearing += MainTabAndroidPage_Appearing; 25this.CurrentPageChanged += MainTabAndroidPage_CurrentPageChanged; 26} 27 28private void MainTabAndroidPage_Appearing(object sender, EventArgs e) 29{ 30UpdateNavigationBar(); 31} 32 33private void MainTabAndroidPage_CurrentPageChanged(object sender, System.EventArgs e) 34{ 35UpdateNavigationBar(); 36} 37 38private void UpdateNavigationBar() 39{ 40Title = CurrentPage.Title; 41} 42 43private void InitTabPages() 44{ 45this.Children.Add(new MessagePage() { Title = "消息", Icon = "icon_chat" }); 46this.Children.Add(new ContactsPage() { Title = "通讯录", Icon = "icon_org" }); 47this.Children.Add(new WorkStagePage() { Title = "工作台", Icon = "icon_table" }); 48this.Children.Add(new ProfilePage() { Title = "我", Icon = "icon_me" }); 49} 50 51 52} 53 }

View CodeXaml代码：

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< ?xml version="1.0" encoding="utf-8" ?> < naxam:BottomTabbedPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:naxam="clr-namespace:Naxam.BottomNavs.Forms; assembly=Naxam.BottomNavs.Forms" x:Class="XFPractice.Pages.MainTab.MainTabAndroidPage"> < /naxam:BottomTabbedPage>

View Code仅仅是以上代码还不足以达到我们期望的效果，还需要在MainActivity中添加如下代码，并在OnCreate中调用：

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void SetupBottomTabs() { var stateList = new Android.Content.Res.ColorStateList( new int[][] { new int[] { Android.Resource.Attribute.StateChecked }, new int[] { Android.Resource.Attribute.StateEnabled } }, new int[] { Color.Red, //Selected Color.White //Normal }); BottomTabbedRenderer.BackgroundColor = new Color(0x9C, 0x27, 0xB0); BottomTabbedRenderer.FontSize = 10f; BottomTabbedRenderer.IconSize = 24; BottomTabbedRenderer.ItemTextColor = stateList; BottomTabbedRenderer.ItemIconTintList = stateList; //BottomTabbedRenderer.Typeface = Typeface.CreateFromAsset(this.Assets, "architep.ttf"); //BottomTabbedRenderer.ItemBackgroundResource = Resource.Drawable.bnv_selector; BottomTabbedRenderer.ItemSpacing = 4; //BottomTabbedRenderer.ItemPadding = new Xamarin.Forms.Thickness(6); BottomTabbedRenderer.BottomBarHeight = 56; BottomTabbedRenderer.ItemAlign = ItemAlignFlags.Center; BottomTabbedRenderer.ShouldUpdateSelectedIcon = true; BottomTabbedRenderer.MenuItemIconSetter = (menuItem, iconSource, selected) => { var iconized = Iconize.FindIconForKey(iconSource.File); if (iconized == null) { if (selected == true) iconSource = iconSource + "_sel"; BottomTabbedRenderer.DefaultMenuItemIconSetter.Invoke(menuItem, iconSource, selected); return; } var drawable = new IconDrawable(this, iconized).Color(selected ? Color.Red : Color.White).SizeDp(30); menuItem.SetIcon(drawable); }; }

View Code资源文件：

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如此即可实现Android底部导航栏了。
在Xamarin.Forms 3.0中，由于Xamarin.Forms的一个bug，会导致页面在pop后导致崩溃，解决方案：http://www.cnblogs.com/devin_zhou/p/9028214.html
【Xamarin.Forms Android 底部导航栏】