在Xamarin Studio中以编程方式创建NSView [英] Create NSView programmatically in Xamarin Studio

问题描述

我正在尝试找到我之前提出的问题的解决方案:在Xamarin.Mac应用程序

I am trying to find a solution to this question I asked earlier: Populate SourceList in Xamarin.Mac app

我目前正在尝试实现NSOutlineViewDelegate的GetView方法，以查看是否可以在我拥有的OutlineView中创建一些文本.

I am currently trying to implement the GetView method of the NSOutlineViewDelegate to see if that may create some text in the OutlineView I have.

但是我一直坚持尝试向NSView对象添加内容.当我看示例OutlineView(将其拖到窗口中时，默认情况下会看到一个示例)，每个项目都有一个TableCellView.结构看起来像这样(首先是标题，然后是常规项目):

But I am stuck at trying to add stuff to the NSView object. When I look at the example OutlineView (the one you get by default when you drag it onto your window), there's a TableCellView for each item. The structure looks like this (header first, then regular item):

Table Cell View
  Static Text - HEADER CELL
    Text Field Cell - HEADER CELL

Table Cell View
  Image View
    Image Cell
  Static Text - Table View Cell
    Text Field Cell - Table View Cell

到目前为止，我的方法如下:

So far my method looks like this:

public override NSView GetView (NSOutlineView outlineView, NSTableColumn tableColumn, NSObject item)
{
    var navigation = item as Navigation;
    var cell = new NSTableCellView();

    if (navigation.IsHeader) {
    } else {
    }

    return cell;
}

我的第一个猜测是标题的内容，例如，我创建一个NSTableHeaderCell并将StringValue属性设置为navigation.Name.但是我不知道如何将其作为孩子添加到我的NSTableViewCell.

My first guess what that for the header, for example, I create a NSTableHeaderCell and set the StringValue property to navigation.Name. But I have no idea how to then add it as a child to my NSTableViewCell.

还是我要以一种完全错误的方式来解决这个问题?我是Mono和Xamarin的新手(仅使用WPF和XAML完成过C#和Visual Studio)，而我以前从未在Objective-C中完成过编程(因此花了我一段时间才弄清楚方法/类的奇怪语法) ).

Or am I going about this the completely wrong way? I am very new to Mono and Xamarin (have only done C# and Visual Studio using WPF and XAML) and I have never before done programming in Objective-C before (so it took me a while to figure out the weird syntax for methods/classes).

推荐答案

您将在XCode中看到Table Cell View对象具有可以设置的标识符".就我而言，我有"HeaderCell"和"DataCell".

You'll see in XCode that the Table Cell View objects have an 'Identifier' that you can set. In my case I have 'HeaderCell' and 'DataCell'.

我的代码如下:

public override NSView GetView(NSOutlineView outlineView, NSTableColumn tableColumn, NSObject item)
{
    if(IsGroupItem(outlineView, item))
    {
        return outlineView.MakeView("HeaderCell", this);
    }

    return outlineView.MakeView("DataCell", this);
}

这将创建XCode中定义的TableCellView的适当实例.

This will create an appropriate instance of the TableCellView defined in XCode.

就我而言，我使用Cocoa绑定而不是数据源，因此我的视图自动填充了数据.这可能是您要研究的一种方法，因为它与WPF/XAML数据绑定方法非常接近.但是，它具有陡峭的学习曲线，并且难以调试(例如WPF/XAML数据绑定！).

In my case, I use Cocoa bindings rather than a data source, so my views get populated with data automatically. This may be an approach you want to investigate because it is much closer to the WPF/XAML way of databinding. However, it has a steep learning curve and is difficult to debug (like WPF/XAML databinding!).

您不仅可以返回单元格，还可以访问它的子视图并进行适当设置.像这样:

Instead of simply returning the cell, you could access it's subviews and set them up appropriately. Something like:

var dataView = outlineView.MakeView("DataCell", this);
((NSImageView)dataView.Subviews[0]).Image = // assign an image
((NSTextField)dataView.Subviews[1]).StringValue = // assign your text
return dataView;

(注意:我只是从脑海中键入内容，它可能无法按原样工作-但希望您能理解这个想法)

(Note: I just typed that from the top of my head, it may not work as-is - but hopefully you get the idea)

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