控制器键“选择”是什么？它如何获得默认状态？

发布于 2024-11-27 02:29:27 字数 760 浏览 4 评论 0原文

我现在正在开发一个应用程序，需要使用绑定作为控制器的粘合代码。我发现本教程将 NSStepper 和 NSTextField 绑定到模型，并且工作正常。问题是我需要以编程方式执行此操作，但这有点令人困惑。

我在控制器类中做了什么：

[self    bind:@"contentObject" 
     toObject:_model 
  withKeyPath:@"self" 
      options:nil];

其中 _model 是我的模型。但是，如果我这样做：

[someKVCObject bind:@"value" 
           toObject:self 
        withKeyPath:@"selection.somethingInMyModel" 
            options:nil];

它不会按我的预期工作。

有人可以向我解释一下，就像我五岁一样，selection 部分对于 NSObjectController 来说是什么，以及如何让它像教程一样工作，以便它引用模型对象？

原文

I'm working on an app right now that needs to use bindings as glue code from the controller. I found this tutorial which bound an NSStepper and NSTextField to a model and it works fine. The problem is that I need to do this programmatically, but it's a bit confusing.

Here's the tutorial.

What I've done in my controller class:

[self    bind:@"contentObject" 
     toObject:_model 
  withKeyPath:@"self" 
      options:nil];

where _model is my model. But then, if I do this:

[someKVCObject bind:@"value" 
           toObject:self 
        withKeyPath:@"selection.somethingInMyModel" 
            options:nil];

It doesn't work as I expect.

Can someone explain to me like I'm five what the selection part is for an NSObjectController and how I can make it work like the tutorial does so that it references the model object?

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