Why does Cocoa binding use both KVC and KVO and not just KVC?
为什么可可绑定使用知识和KVO而不仅仅是知识吗？
When using KVO in a category implementation, it is recommended that a custom associated-object be used as an observer, rather than the object observing itself.
当在一个category的实现中使用 KVO时，建议用一个自定义的关联对象而不是该对象本身作观察者。
When using KVO in a category implementation, it is recommended that a custom associated-object be used as an observer, rather than the object observing itself.
当在一个category的实现中使用KVO时，建议用一个自定义的关联对象而不是该对象本身作观察者。
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