将MvxBindableTableViewCell的附件绑定到布尔值 [英] Bind MvxBindableTableViewCell's Accessory to boolean

问题描述

我坚持如何将MvxBindableTableViewCell的附件绑定到布尔值.

I'm stuck on how to bind the MvxBindableTableViewCell's accessory to a boolean.

我将表的ItemsSource绑定到了我的ViewModel中的一个列表，显示了一个不错的可单击项列表.

I have the table's ItemsSource bound to a list in my ViewModel, showing a nice list of clickable items.

但是，我希望仅在标记此对象时才显示单元格的附件(UITableViewCellAccessory.Checkmark).通过标记，我的意思是模型中的布尔值设置为true.

However I want the cell's accessory (UITableViewCellAccessory.Checkmark) to show only when this object is flagged. By flagged I mean a boolean in the model is set to true.

有人知道如何绑定单元的附件吗?

Does anyone know how to bind the cell's accessory?

我可以根据模型的布尔值来显示附件，但它没有绑定.

I can show the Accessory depending on the model's boolean, but it's not bound.

protected override UITableViewCell GetOrCreateCellFor(UITableView tableView, NSIndexPath     indexPath, object item)
    {
        UITableViewCell cell = tableView.DequeueReusableCell(CellIdentifier);
        if (cell == null)
            cell = new PlotsTableViewCell(UITableViewCellStyle.Subtitle, CellIdentifier);

        Plot p = (Plot)item;
        if (p.Done)
            cell.Accessory = UITableViewCellAccessory.Checkmark;
        return cell;
    }

推荐答案

我认为您可能可以在PlotsTableViewCell中进行此操作.

I think you can probably do this in your PlotsTableViewCell.

如果声明自定义单元格，则可以在运行时在该单元格中进行绑定.

If you declare a custom cell, then you can bind within that cell at runtime.

您可以在以下示例中查看此示例:

You can see an example of this in: https://github.com/slodge/MvvmCross/blob/vnext/Sample%20-%20CirriousConference/Cirrious.Conference.UI.Touch/Cells/SessionCell2.cs which is used in the sessions display:

您可以看到该单元格提供了以下公共属性:

You can see that the cell provides public properties like:

public string RoomText
    {
    get { return Label2.Text; }
    set { if (Label2 != null) Label2.Text = value; }
    }

，然后提供类似以下内容的绑定文本:

and then provides binding text like:

    'RoomText':{'Path':'Item.Session','Converter':'SessionSmallDetails','ConverterParameter':'SmallDetailsFormat'},

要将附件绑定到Bool，您应该可以执行以下操作:

For binding an Accessory to a Bool, you should be able to do something like:

public bool IsDone
    {
    get { return Accessory == UITableViewCellAccessory.Checkmark; }
    set 
    {
        if (value) 
        {
            Accessory = UITableViewCellAccessory.Checkmark; 
        }
        else 
        {
            Accessory = UITableViewCellAccessory.None; 
        }
    }
    }

含文字:

    'IsDone':{'Path':'Done'},

---

作为一种高级技术，您还可以在自定义绘制按钮内使用自定义图像，而不是在单元格中使用附件.要查看如何执行此操作，请查看该会议示例中如何绑定IsFavorite属性-请参见

---

As an advanced technique, you could also use a custom image inside a custom drawn button instead of an Accessory in your cell. To see how to do this, take a look at how the IsFavorite property is bound in that conference sample - see the two way custom bindings in https://github.com/slodge/MvvmCross/tree/vnext/Sample%20-%20CirriousConference/Cirrious.Conference.UI.Touch/Bindings

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