绑定到 NSTreeController SelectionIndexPaths
我想通过执行以下操作以编程方式绑定到 NSTreeController 的选择索引路径（以便我可以获取一个选择字符串并在文本视图中显示）
[activePDFView绑定：@“名称” toObject:treeController withKeyPath:@"selectionIndexPaths.nodeName" 选项：选项]；
树控制器绑定到一个 NSMutableArray，其中包含具有“nodeName”属性的对象。 NSMutableArray 内的对象对于属性“nodeName”来说是符合 KVC 的，因为我已经实现了正确的访问器。
当我编译时，我收到以下消息
'[<__NSArray0 0x1001698d0>> addObserver:forKeyPath:选项:上下文:] 不支持。关键路径：nodeName'
我不太确定，但我的绑定正确吗？
谢谢。
I want to bind to a NSTreeController's selectionIndexPaths programatically by doing the following (so that I can get a string a selection and display in a text view)
[activePDFView bind:@"name"
toObject:treeController
withKeyPath:@"selectionIndexPaths.nodeName"
options:options];
The tree controller is bound to a NSMutableArray that contains objects with the "nodeName" property. The object inside the NSMutableArray is KVC compliant for the property "nodeName" since I've implemented the proper accessors.
When I compile, I get the following message
'[<__NSArray0 0x1001698d0>
addObserver:forKeyPath:options:context:]
is not supported. Key path: nodeName'
I am not quite sure but is my binding correct?
Thanks.
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看起来您想要绑定的不是
selectionIndexPaths，而是selection绑定。selectionIndexPaths绑定将返回一个NSIndexPath对象数组，通常仅在将大纲/浏览器视图的选择绑定到树控制器时使用。selection实际上返回一个代理对象，它可以表示单个或多个选择，并将任何 KVC 请求传递到底层选定的对象。它在NSObjectController中定义，它是NSTreeController的超类。在你的情况下，你会想要：It looks like what you want to bind to is not
selectionIndexPaths, but instead theselectionbinding. TheselectionIndexPathsbinding will return an array ofNSIndexPathobjects, which is typically only used when binding an outline/browser view's selection to the tree controller.selectionactually returns a proxy object which can represent either a single or multiple selection, and passes through any KVC requests to the underlying selected object(s). It's defined inNSObjectController, which is a superclass ofNSTreeController. In your case, you would want: