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这种观察-被观察模型适用于这样的情况,比方说根据A(数 据类)的某个属性值变化,B(view类)中的某个属性做出相应变化。对于推崇MVC的cocoa而言,kvo应用的地方非常广泛。(这样的机制听起来类似Notification,但是notification是需要一个发送notification的对象,一般是notificationCenter,来通知观察者。而kvo是直接通知到观察对...
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