cocoa - 为什么 NSObjectController 不更新它绑定的模型属性？

Question

我像这样配置绑定：

@property (nonatomic, copy) NSString *name;
@property (nonatomic, strong) NSObjectController *controller;

...

self.controller = [[NSObjectController alloc] initWithContent:nil];
[self.controller bind:NSContentObjectBinding toObject:self
          withKeyPath:@"name" options:nil];
[self.controller addObject:@"Hello"];

...

NSTextField *textField = [NSTextField textFieldWithString:nil];
[textField bind:NSValueBinding toObject:self.controller
    withKeyPath:@"content" options:nil];

启动后文本字段显示字符串“Hello”，然后我将其更改为“World”并按 Return。然而，只有对象控制器的内容被更新：

[controller.content isEqualToString:@"World"]; // YES
         [self.name isEqualToString:@"World"]; // NO — WHY?
         [self.name isEqualToString:@"Hello"]; // YES

那么如何配置NSObjectController来更新它绑定的本地属性呢？

Answer 1

解决了！感谢雅各布·戈尔班：

self.name = @"Hello";
self.controller = [[NSObjectController alloc] initWithContent:nil];
[self.controller bind:NSContentObjectBinding toObject:self
          withKeyPath:@"self" options:nil];

...

NSTextField *textField = [NSTextField textFieldWithString:nil];
[textField bind:NSValueBinding toObject:self.controller
    withKeyPath:@"selection.name" options:nil];