在Xamarin Studio中以编程方式创建NSView

问题描述

我想尝试找到我之前提出的问题的解决方案：

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

我目前正尝试实施<$ c> GetView $ c> NSOutlineViewDelegate ，看看是否可能在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.

但我被困在尝试添加东西NSView对象。当我看到示例OutlineView（默认情况下，当你将它拖到你的窗口），有一个 TableCellView 每个项目。结构看起来像这样（首先是标题，然后是常规项）：

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;
}

$ b $ p我首先猜测是什么对于头，例如，我创建一个 NSTableHeaderCell 并将 StringValue 属性设置为 navigation.Name 。但我不知道如何将它作为一个孩子添加到我的 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.

这是完全错误的方式吗？我非常新的Mono和Xamarin（只做了C＃和Visual Studio使用WPF和XAML），我从来没有在Objective-C之前完成编程之前（所以我花了一段时间，以找出方法/类的奇怪的语法）。

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中看到表单元格视图对象有一个标识符，您可以设置。在我的例子中，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'.

我的代码看起来像这样：

My code looks like this:

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 TableCellView 在XCode中定义。

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

在我的例子中，我使用Cocoa绑定而不是数据源，所以我的视图自动填充数据。这可能是一个你想调查的方法，因为它更接近WPF / XAML数据绑定方式。但是，它有一个陡峭的学习曲线，很难调试（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!).

而不是简单地返回单元格，你可以访问它的子视图设置适当。类似：

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：我刚刚输入的是从顶部开始， - 但希望你能得到想法）

(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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