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Merge pull request ChenYilong#57 from raozhizhen/patch-4
修改49题答案
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01《招聘一个靠谱的iOS》面试题参考答案/《招聘一个靠谱的iOS》面试题参考答案(下).md

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@@ -943,7 +943,7 @@ observer中需要实现一下方法:
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3. 格式 @"@sum.age"或 @"集合属性[email protected]"
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###49. KVC和KVO的keyPath一定是属性么?
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KVO支持实例变量
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KVC 支持实例变量,KVO 只能手动支持[手动设定实例变量的KVO实现监听](https://yq.aliyun.com/articles/30483)
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###50. 如何关闭默认的KVO的默认实现,并进入自定义的KVO实现?
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