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liyuan116 / Learning

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KVO #7

Open liyuan116 opened 7 years ago

liyuan116 commented 7 years ago

比如调用 setNow: 时，系统还会以某种方式在中间插入 wilChangeValueForKey: 、 didChangeValueForKey: 和 observeValueForKeyPath:ofObject:change:context: 的调用