ChenYilong / ChenYilong/iOSInterviewQuestions
第46题,KVO问题
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Description
我测试的是先调用willChangeValueForKey: 然后调用的observeValueForKeyPath:ofObject:change:context: ,最后调用的是didChangeValueForKey:
不知道你写那段话是我理解错了还是你写错了.
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