objective-c - NSUserDefaults 和绑定(bind)

Question

如何同步两个界面元素并在终止时保存值？我将复选框的状态和启用的文本字段连接到 NSObjectController。 “内容”导出也连接到复选框。 (不知道为什么？)。它与 NSObjectController 一起使用，但每当我将值绑定(bind)到 NSUserDefaultsController 时，我的应用程序在启动时崩溃并出现以下错误:

An uncaught exception was raised [ addObserver: forKeyPath:@"selection.enabled" options:0x0 context:0x0] was sent to an object that is not KVC-compliant for the "selection" property. *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ addObserver: forKeyPath:@"selection.enabled" options:0x0 context:0x0] was sent to an object that is not KVC-compliant for the "selection" property.'

Answer 1

selection 来自 NSObjectController，而 NSUserDefaultsController 并不是一种 NSObjectController。您需要通过其值进行绑定(bind)。