mvvmCross的SideMenu

问题描述

试图为Xamarin.iOS应用实现侧边菜单，但在控制台中得到警告:

Tying to implement side menu for Xamarin.iOS app, but got warning in console:

步骤

1)创建菜单的基类(来自样本)

1) Create base class for menu (from sample)

public class BaseMenuViewController<T> : MvxViewController<T>, IMvxSidebarMenu where T : class, IMvxViewModel
{
    public virtual UIImage MenuButtonImage => UIImage.FromBundle("burger");

    public virtual bool AnimateMenu => true;
    public virtual float DarkOverlayAlpha => 0;
    public virtual bool HasDarkOverlay => false;
    public virtual bool HasShadowing => true;
    public virtual bool DisablePanGesture => false;
    public virtual bool ReopenOnRotate => true;

    private int MaxMenuWidth = 300;
    private int MinSpaceRightOfTheMenu = 55;

    public int MenuWidth => UserInterfaceIdiomIsPhone ?
        int.Parse(UIScreen.MainScreen.Bounds.Width.ToString()) - MinSpaceRightOfTheMenu : MaxMenuWidth;

    private bool UserInterfaceIdiomIsPhone
    {
        get { return UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Phone; }
    }

    public virtual void MenuWillOpen()
    {
    }

    public virtual void MenuDidOpen()
    {
    }

    public virtual void MenuWillClose()
    {
    }

    public virtual void MenuDidClose()
    {
    }
}

2)实现VisibleView(第一个可见)

2) Implement VisibleView (First one that will be visible)

[MvxSidebarPresentation(MvxPanelEnum.Center, MvxPanelHintType.ResetRoot, true)]
public partial class ContentViewController : MvxViewController<ContentViewModel>
{
    public ContentViewController()
        : base("ContentViewController", null)
    {
    }

    public override void ViewDidLoad()
    {
        base.ViewDidLoad();

        View.BackgroundColor = UIColor.Purple;
        this.ViewModel.Show<MenuViewModel>();
    }
}

3)实现MenuElementViewController(SideMenu)

3) Implement MenuElementViewController (SideMenu)

[Register("MenuViewController")]
[MvxSidebarPresentation(MvxPanelEnum.Left, MvxPanelHintType.PushPanel, false)]
public class MenuViewController : BaseMenuViewController<MenuViewModel>
{
    public override void ViewDidLoad()
    {
        base.ViewDidLoad();

        this.View.BackgroundColor = UIColor.Red;
    }
}

4)在设置中为SideMenu添加演示者

4) Add presenter for SideMenu in Setup

protected override IMvxIosViewPresenter CreatePresenter()
{
    return new MvxSidebarPresenter((MvxApplicationDelegate)ApplicationDelegate, Window);
}

预期行为

应该从1点看到带有汉堡按钮的控制器

Should see controller from point 1 with burger button

实际行为

point1上的控制器可见，但没有汉堡按钮，来自point2的控制器未初始化，在控制台中警告有关缺少类装饰的警告，但如您所见，警告也存在(不赞成使用的警告，需要更新-检查源代码-搜索正确的类型，但警告有旧消息)

Controller from point1 become visible but without burger button,Controller from point2 not initialized,Warning in console about missed decoration for class, but as u see they are present (also warnings deprecated and need to be updated - check source code - searching done for correct type, but warning has old message )

配置

MvvmCross v 5.0.6

MvvmCross v 5.0.6

• MvvmCross
• MvvmCross.Core
• MvvmCross.Binding
• MvvmCross.iOS.Support
• MvvmCross.iOS.Support.XamarinSidebar
• MvvmCross.Platform
• SidebarNavigation

在查找错误时还看到了这篇文章-重新检查并看起来一切都很好，但无法正常工作.

Also saw this post while looking for error - recheck and looks like everything is fine, but not work.

警告日志:

mvx:诊断:0.21显示ViewModel ContentViewModel iOSNavigation:诊断:0.21要求浏览

mvx:Diagnostic: 0.21 Showing ViewModel ContentViewModel iOSNavigation:Diagnostic: 0.21 Navigate requested

mvx:警告:0.23找不到侧面菜单.若要使用侧面菜单，请使用'MvxPanelPresentationAttribute'类装饰viewcontroller类，并将面板设置为'Left'或'Right'.

mvx:Warning: 0.23 No sidemenu found. To use a sidemenu decorate the viewcontroller class with the 'MvxPanelPresentationAttribute' class and set the panel to 'Left' or 'Right'.

我还希望在调用this.ViewModel.Show<MenuViewModel>();时看到ViewDidload的ViewDidload中的breakPoint停止，但是在创建此控制器的模型的同一时刻，它从未被触发.

I also expect to see breakPoint stop in ViewDidload for MenuViewController when call this.ViewModel.Show<MenuViewModel>(); but it's never triggered, in same moment model for this controller created.

有人可以建议做错了什么吗?

Can someone advice what was done incorrect?

编辑

我能够设置带有侧边栏的新的空项目并且它按预期工作.但是相同的代码在我当前的项目中不起作用-我不知道为什么装饰属性没有按预期读取....

I was able to setup new empty project with sidebar and it's work as expected. But same code not work in my current projects - I don't know why decorated attributes are not read as expected....

推荐答案

花2天的时间找出原因-与检测和解析装饰器属性有关的问题.

Spend 2 days to figure out the reason - the issue related to detection and parsing decorator attributes.

由于种种原因，我之间很少共享代码库的项目[MvxSidebarPresentation(MvxPanelEnum.Left, MvxPanelHintType.PushPanel, false)]如果放置在共享项目中而不放在项目本身中，则不考虑在内.在同一时刻

I have few projects that share codebase between each other, and due to some reason[MvxSidebarPresentation(MvxPanelEnum.Left, MvxPanelHintType.PushPanel, false)]is not taken in to account if it placed in shared project but not in project itself. In same moment

[MvxSidebarPresentation(MvxPanelEnum.Center, MvxPanelHintType.ResetRoot, true)]
[MvxSidebarPresentation(MvxPanelEnum.Center, MvxPanelHintType.ResetRoot, true, MvxSplitViewBehaviour.Master)]
[MvxSidebarPresentation(MvxPanelEnum.Center, MvxPanelHintType.PushPanel, true, MvxSplitViewBehaviour.Detail)]

按预期工作.

解决方法->子类在每个应使用项目的项目中共享菜单类(带有MvxPanelEnum.Left).

Workaround -> subclass shared menuClass (with MvxPanelEnum.Left) in each project where it should be used.

不确定此问题是否与mvvmCross lib或Xamarin有关.

Not sure if this issue related to mvvmCross lib or to Xamarin.

这篇关于mvvmCross的SideMenu的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！