Blazor實(shí)現(xiàn)微信的Tab切換功能

更新時(shí)間：2023年01月23日 09:44:45 作者：token

這篇文章主要介紹了Blazor實(shí)現(xiàn)微信的Tab切換功能,本文中的UI組件使用的是MASA?Blazor,您也可以是其他的UI框架，這個(gè)并不影響實(shí)際的運(yùn)行效果，本文案例是兼容PC和Android的，演示效果是android中執(zhí)行的，在PC中執(zhí)行效果依然有效，需要的朋友可以參考下

是否有小伙伴在使用tab的時(shí)候想進(jìn)行滑動(dòng)切換Tab？

并且有滑動(dòng)左出左進(jìn)，右出右進(jìn)的效果，本文將講解怎么在Blazor中去通過(guò)滑動(dòng)切換Tab

本文中的UI組件使用的是MASA Blazor,您也可以是其他的UI框架，這個(gè)并不影響實(shí)際的運(yùn)行效果，本文案例是兼容PC和Android的，演示效果是android中執(zhí)行的，在PC中執(zhí)行效果依然有效（親測(cè)）

首先安裝MASA Blazor 根據(jù) MASA Blazor安裝MASA Blazor

準(zhǔn)備工作

創(chuàng)建 AppBar.razor文件
修改MainLayout.razor文件代碼

@inherits LayoutComponentBase

<MApp>
    <AppBar>
        <div class="body">
            @Body
        </div>
    </AppBar>
</MApp>

<style>
.body {
    /*設(shè)置內(nèi)容高度 需要減去導(dǎo)航欄的高度*/
    height: calc(100vh - 48px);
    max-height: calc(100vh - 48px);
}
</style>

創(chuàng)建 AppBar.razor.css 文件并且添加相關(guān)代碼，以下代碼是為了實(shí)現(xiàn)切換的時(shí)候有一個(gè)出入效果，具體代碼案例來(lái)自Animista - On-Demand CSS Animations Library

/*左邊滑動(dòng)出*/
.slide-out-left {
    -webkit-animation: slide-out-left 0.5s;
    animation: slide-out-left 0.5s;
}

/*右邊滑動(dòng)出*/
.slide-out-right {
    -webkit-animation: slide-out-right 0.5s;
    animation: slide-out-right 0.5s;
}

/*右邊滑動(dòng)進(jìn)*/
.slide-in-right {
    -webkit-animation: slide-in-right 0.5s cubic-bezier(0.250, 0.460, 0.450, 0.940) both;
    animation: slide-in-right 0.5s cubic-bezier(0.250, 0.460, 0.450, 0.940) both;
}

/*左邊滑動(dòng)進(jìn)*/
.slide-in-left {
    -webkit-animation: slide-in-left 0.5s;
    animation: slide-in-left 0.5s;
}

@-webkit-keyframes slide-out-left {
    0% {
        -webkit-transform: translateX(0);
        transform: translateX(0);
        opacity: 1;
    }

    100% {
        -webkit-transform: translateX(-1000px);
        transform: translateX(-1000px);
        opacity: 0;
    }
}

@keyframes slide-out-left {
    0% {
        -webkit-transform: translateX(0);
        transform: translateX(0);
        opacity: 1;
    }

    100% {
        -webkit-transform: translateX(-1000px);
        transform: translateX(-1000px);
        opacity: 0;
    }
}


@-webkit-keyframes slide-out-right {
    0% {
        -webkit-transform: translateX(0);
        transform: translateX(0);
        opacity: 1;
    }

    100% {
        -webkit-transform: translateX(1000px);
        transform: translateX(1000px);
        opacity: 0;
    }
}

@keyframes slide-out-right {
    0% {
        -webkit-transform: translateX(0);
        transform: translateX(0);
        opacity: 1;
    }

    100% {
        -webkit-transform: translateX(1000px);
        transform: translateX(1000px);
        opacity: 0;
    }
}


@-webkit-keyframes slide-in-left {
    0% {
        -webkit-transform: translateX(-1000px);
        transform: translateX(-1000px);
        opacity: 0;
    }

    100% {
        -webkit-transform: translateX(0);
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slide-in-left {
    0% {
        -webkit-transform: translateX(-1000px);
        transform: translateX(-1000px);
        opacity: 0;
    }

    100% {
        -webkit-transform: translateX(0);
        transform: translateX(0);
        opacity: 1;
    }
}
@-webkit-keyframes slide-in-right {
    0% {
        -webkit-transform: translateX(1000px);
        transform: translateX(1000px);
        opacity: 0;
    }

    100% {
        -webkit-transform: translateX(0);
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slide-in-right {
    0% {
        -webkit-transform: translateX(1000px);
        transform: translateX(1000px);
        opacity: 0;
    }

    100% {
        -webkit-transform: translateX(0);
        transform: translateX(0);
        opacity: 1;
    }
}

創(chuàng)建AppBar的模型用于動(dòng)態(tài)添加導(dǎo)航欄, 創(chuàng)建AppBarDto.cs文件并添加相關(guān)代碼

public class AppBarDto
{
    public string Key { get; set; }

    /// <summary>
    /// 標(biāo)題
    /// </summary>
    public string Title { get; init; }

    /// <summary>
    /// 圖標(biāo)
    /// </summary>
    public string? Icon { get; set; }

    /// <summary>
    /// 路由
    /// </summary>
    public string Href { get; init; }

    public AppBarDto(string title, string href, string? icon = null)
    {
        Title = title;
        Icon = icon;
        Href = href;
        Key = Guid.NewGuid().ToString("N");
    }
}

添加相關(guān)頁(yè)面，在Pages文件夾下，分別創(chuàng)建Index.razor,Feature.razor,Friend.razor,PersonalCenter.razor

文件相關(guān)代碼：
Index.razor

@page "/"
<h3>Index</h3>

Feature.razor

@page "/feature"
<h3>Feature</h3>

Friend.razor

@page "/friend"
<h3>Friend</h3>

PersonalCenter.razor

@page "/personal-center"
<h3>PersonalCenter</h3>

@page "/personal-center"
<h3>PersonalCenter</h3>

修改AppBar.razor代碼

<div class="@Class" @ontouchstart="TouchStart" @ontouchend="TouchEnd" @onmousedown="Mousedown" @onmouseup="Mouseup" style="height: 100%">
    @ChildContent
</div>

 @*這里也可以是其他組件的Tab，其實(shí)只是記錄當(dāng)前的導(dǎo)航的數(shù)據(jù)*@
<MTabs Centered
       BackgroundColor="indigo"
       ShowArrows="false"
       Value="selectModel.Key"
       Dark>
    @foreach (var i in AppBars)
    {
        <MTab Value="i.Key" OnClick="()=>GoHref(i)">
            @if (!string.IsNullOrEmpty(i.Icon))
            {
                <MIcon Dark>@i.Icon</MIcon>
            }
            @i.Title
        </MTab>
    }
</MTabs>

創(chuàng)建AppBar.razor.cs 添加以下代碼

public partial class AppBar
{
    #region Inject

    [Inject]
    public required NavigationManager NavigationManager { get; set; }

    #endregion

    private readonly List<AppBarDto> AppBars = new();

    [Parameter]
    public RenderFragment ChildContent { get; set; }

    private AppBarDto selectModel;

    private string Class { get; set; }

    protected override void OnInitialized()
    {
        AppBars.Add(new AppBarDto("首頁(yè)", "/", "home"));
        AppBars.Add(new AppBarDto("好友", "/personal-center", "mdi-account-group-outline"));
        AppBars.Add(new AppBarDto("功能", "/feature", "mdi-wrench"));
        AppBars.Add(new AppBarDto("個(gè)人中心", "/personal-center", "mdi-badge-account-alert"));

        // 默認(rèn)選擇的導(dǎo)航標(biāo)簽
        selectModel = AppBars[0];

        base.OnInitialized();
    }

    /// <summary>
    /// 導(dǎo)航欄跳轉(zhuǎn)
    /// </summary>
    /// <param name="appBar"></param>
    private void GoHref(AppBarDto appBar)
    {
        // 防止重復(fù)點(diǎn)擊
        if(appBar == selectModel)
        {
            return;
        }

        // 當(dāng)點(diǎn)擊導(dǎo)航的索引大于現(xiàn)在導(dǎo)航時(shí)啟動(dòng)滑動(dòng)效果
        if(AppBars.IndexOf(appBar) > AppBars.IndexOf(selectModel))
        {
            Class = "slide-out-left";
            Task.Run(async () =>
            {
                // 由于特效時(shí)間為0.5s 這里是等待特效完成
                await Task.Delay(450);
                NavigationManager.NavigateTo(selectModel.Href);
                Class = "slide-in-right";
                _ = InvokeAsync(StateHasChanged);
            });
        }
        // 當(dāng)點(diǎn)擊導(dǎo)航的索引小于現(xiàn)在導(dǎo)航時(shí)啟動(dòng)滑動(dòng)效果
        else if (AppBars.IndexOf(appBar) < AppBars.IndexOf(selectModel))
        {
            Class = "slide-out-right";
            Task.Run(async () =>
            {
                // 由于特效時(shí)間為0.5s 這里是等待特效完成
                await Task.Delay(450);
                NavigationManager.NavigateTo(selectModel.Href);
                Class = "slide-in-left";
                _ = InvokeAsync(StateHasChanged);
            });
        }
        selectModel = appBar;
        NavigationManager.NavigateTo(appBar.Href);
    }


    /// <summary>
    /// 開(kāi)始X坐標(biāo)
    /// </summary>
    private double _startX;


    #region 移動(dòng)端滑動(dòng)處理

    /// <summary>
    /// 記錄開(kāi)始坐標(biāo)
    /// </summary>
    /// <param name="args"></param>
    private void TouchStart(TouchEventArgs args)
    {
        var touch = args.ChangedTouches[0];
        _startX = touch.ScreenX;
    }

    private void TouchEnd(TouchEventArgs args)
    {
        var touch = args.ChangedTouches[0];
        Switchover((decimal)touch.ScreenX);
    }

    #endregion

    #region PC滑動(dòng)處理

    /// <summary>
    /// 記錄開(kāi)始坐標(biāo)
    /// </summary>
    /// <param name="args"></param>
    private void Mousedown(MouseEventArgs args)
    {
        _startX = args.ScreenX;
    }

    private void Mouseup(MouseEventArgs args)
    {
        Switchover((decimal)args.ScreenX);
    }

    #endregion

    private void Switchover(decimal screenX)
    {
        var index = AppBars.IndexOf(selectModel);
        // 限制過(guò)度滑動(dòng)
        if (index == AppBars.Count || index > AppBars.Count)
        {
            return;
        }

        // 設(shè)置滑動(dòng)最大位限制，達(dá)到這個(gè)限制才滑動(dòng)生效
        var size = 200;

        // 需要滑動(dòng)200才切換 如果開(kāi)始坐標(biāo)x大于 當(dāng)前結(jié)束的x坐標(biāo)往右邊切換tab
        if ((decimal)_startX - size > screenX)
        {
            // 如果右邊往左邊滑動(dòng) 當(dāng)前索引是當(dāng)前最大數(shù)量的話不需要切換
            if (index == AppBars.Count - 1)
            {
                return;
            }
            selectModel = AppBars[index + 1];
            Class = "slide-out-left";

            Task.Run(async () =>
            {
                // 由于特效時(shí)間為0.5s 這里是等待特效完成
                await Task.Delay(450);
                NavigationManager.NavigateTo(selectModel.Href);
                Class = "slide-in-right";
                _ = InvokeAsync(StateHasChanged);
            });
        }
        else if ((decimal)_startX + size < screenX)
        {
            // 如果左邊往右邊滑動(dòng) 當(dāng)前索引是0的話不需要切換
            if (index == 0)
            {
                return;
            }
            selectModel = AppBars[index - 1];
            Class = "slide-out-right";
            Task.Run(async () =>
            {
                // 由于特效時(shí)間為0.5s 這里是等待特效完成
                await Task.Delay(450);
                NavigationManager.NavigateTo(selectModel.Href);
                Class = "slide-in-left";
                _ = InvokeAsync(StateHasChanged);
            });
        }
    }
}

運(yùn)行效果：