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# System prepended metadata

title: '[오느으릐 제레미]'

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# [오느으릐 제레미]


<img src="https://s3.ap-northeast-2.amazonaws.com/media.yagom-academy.kr/resources/usr/62f273e22b3d440eb03ce0c5/20220906/631759972b3d440eb03d00f9.jpeg" width="250"/>

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### Delegation, Subclassing, KVO, NotificationCenter, Closure

Delegation` One To One

Delegation is more lightweighted then oder observing types 

no need to inherit

Only requires protocols to communicate between classes 

Separating responsibilities

KVO One to Many

NotificationCenter Many To Many


[🌏 ]()
[https://developer.apple.com/documentation/uikit/uiapplication/1622936-delegate](https://developer.apple.com/documentation/uikit/uiapplication/1622936-delegate)


