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lgvv98

[Swift] MVC Pattern ๋ณธ๋ฌธ

apple/๐Ÿก DesignPattern & Architecture

[Swift] MVC Pattern

๐Ÿฅ• ์บ๋Ÿฟ๋งจ 2022. 4. 8. 13:53

MVC Pattern

 

โœ… MVC Pattern

 

(์ฐธ๊ณ ) ์•„๋ž˜์˜ ๊ธ€์„ ์ง์ ‘ ํ•ด์„ํ•˜๊ณ  ์ดํ•ด๋ฅผ ๋ฐ”ํƒ•์œผ๋กœ ์ž‘์„ฑํ•˜์˜€์Šต๋‹ˆ๋‹ค. (์˜ค์—ญ์ด ์žˆ์„ ์ˆ˜๋„ ์žˆ์Šต๋‹ˆ๋‹ค.)

https://www.raywenderlich.com/books/design-patterns-by-tutorials/v3.0/chapters/3-model-view-controller-pattern

 

Design Patterns by Tutorials, Chapter 3: Model-View-Controller Pattern

The model-view-controller (MVC) pattern separates objects into three distinct types: models, views and controllers! MVC is very common in iOS programming, because it's the design pattern that Apple chose to adopt heavily in UIKit. In this chapter you’ll

www.raywenderlich.com

 

โœ… MVC๋ž€?

MVC pattern

 

 

๐ŸŸ  Model : ๋ฐ์ดํ„ฐ๊ฐ€ ์žˆ๋Š” ๊ณณ์œผ๋กœ ์ง€์†์ ์ธ ๋ฐ์ดํ„ฐ, ๋ชจ๋ธ ์˜ค๋ธŒ์ ํŠธ, ๋ฐ์ดํ„ฐ parser, ๋งค๋‹ˆ์ €๋“ค, ๋„คํŠธ์›Œํ‚น ์ฝ”๋“œ๋“ค์ด ์ด๊ณณ์— ์œ„์น˜ํ•ฉ๋‹ˆ๋‹ค.

 -> ์•ฑ์˜ ๋ฐ์ดํ„ฐ๋ฅผ ๋ณด์œ ํ•˜๋ฉฐ, ์ผ๋ฐ˜์ ์œผ๋กœ ๊ตฌ์กฐ์ฒด๋‚˜ ๋‹จ์ˆœ ํด๋ž˜์Šค์ด๋‹ค.

๐ŸŸ  View : ์•ฑ์—์„œ ์œ ์ €์—๊ฒŒ ๋ณด์ด๋Š” ๊ณ„์ธต์ž…๋‹ˆ๋‹ค. ๋น„์ง€๋‹ˆ์Šค ๋กœ์ง์„ ํฌํ•จํ•˜๊ณ  ์žˆ์ง€ ์•Š๊ธฐ ๋•Œ๋ฌธ์— ์žฌ์‚ฌ์šฉ ๋  ์ˆ˜๋„ ์žˆ์Šต๋‹ˆ๋‹ค.

 -> ํ™”๋ฉด์— ์‹œ๊ฐ์  ์š”์†Œ์™€ ์ปจํŠธ๋กค์„ ํ‘œ์‹œํ•œ๋‹ค. ์ผ๋ฐ˜์ ์œผ๋กœ UIView์˜ ํ•˜์œ„ ํด๋ž˜์Šค์ด๋‹ค.

๐ŸŸ  Controller : delegation Pattern์„ ํ†ตํ•ด์„œ view์™€ Model ์‚ฌ์ด๋ฅผ ์ค‘์žฌํ•œ๋‹ค. ์ด์ƒ์ ์ธ ์‹œ๋‚˜๋ฆฌ์˜ค์—์„œ๋Š” Controller entity๋Š” ๊ตฌ์ฒด์ ์œผ๋กœ view์— ๋Œ€ํ•ด์„œ ์•Œ์ง€ ๋ชปํ•œ๋‹ค. ๋Œ€์‹ ์— protocol์„ ํ†ตํ•ด์„œ ์ถ”์ƒํ™”ํ•˜์—ฌ view์™€ ์†Œํ†ตํ•œ๋‹ค. 

(๊ฐ€์žฅ ์ „ํ˜•์ ์ธ ์˜ˆ์ œ๋กœ๋Š” UITableView์—์„œ UITableViewDataSource๋ฅผ ํ†ตํ•ด์„œ ์†Œํ†ตํ•œ๋‹ค.)

 -> ์ผ๋ฐ˜์ ์œผ๋กœ UIViewController์˜ ํ•˜์œ„ ํด๋ž˜์Šค์ด๋‹ค.

 

 

MVC ํŒจํ„ด์€ ์• ํ”Œ์ด UIKit์—์„œ ์ฑ„ํƒํ•˜๊ธฐ๋กœ ํ•œ ๋””์ž์ธ ํŒจํ„ด์ด๋ผ iOSํ”„๋กœ๊ทธ๋ž˜๋ฐ์—์„œ ์ผ๋ฐ˜์ ์ด๋‹ค.

์ปจํŠธ๋กค๋Ÿฌ๋“ค์€ ๊ทธ๋“ค์˜ ๋ชจ๋ธ๊ณผ ๋ทฐ์— strong propertis๋ฅผ ๊ฐ–๋Š”๊ฒƒ์„ ํ—ˆ์šฉํ•  ์ˆ˜ ์žˆ์–ด์„œ, ์ง์ ‘ ์ ‘๊ทผํ•  ์ˆ˜๋„ ์žˆ๋‹ค. ์ปจํŠธ๋กค๋Ÿฌ๋“ค์€ ๋‘˜ ์ด์ƒ์˜ model๊ณผ view๋ฅผ ๊ฐ–๊ณ  ์žˆ์„์ˆ˜๋„ ์žˆ๋‹ค.

 

๋ฐ˜๋Œ€๋กœ! ๋ชจ๋ธ๊ณผ ๋ทฐ๋Š” ์ž์‹ ์˜ ์ปจํŠธ๋กค๋Ÿฌ์— ๋Œ€ํ•ด์„œ strong reference(๊ฐ•ํ•œ ์ฐธ์กฐ)๋ฅผ ํ•˜๋ฉด ์•ˆ๋œ๋‹ค. ์ด๊ฒƒ์€ retain cycle์„ ์•ผ๊ธฐํ•œ๋‹ค.

 

๋Œ€์‹ ์— models์€ properties๋ฅผ observingํ•˜์—ฌ ์†Œํ†ตํ•˜๋ฉฐ, view๋Š” IBActions์„ ํ†ตํ•ด ํ†ต์‹ ํ•œ๋‹ค.

 

์ด๋ฅผ ํ†ตํ•ด models๊ณผ views๋ฅผ ์žฌ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

 

(์ฐธ๊ณ ) ๋ทฐ๋Š” ์ž์‹ ์„ ์†Œ์œ ํ•˜๊ณ  ์žˆ๋Š” ์ปจํŠธ๋กค๋Ÿฌ์— ๋Œ€ํ•ด์„œ delegate๋ฅผ ํ†ตํ•ด weak reference๋ฅผ ๋“ค๊ณ  ์žˆ์„ ์ˆ˜ ์žˆ๋‹ค. (delegation pattern์„ ํ†ตํ•ด ํ™•์ธํ•  ์ˆ˜ ์žˆ๋‹ค.) ์˜ˆ๋ฅผ ๋“ค๋ฉด UITableView์˜ ๊ฒฝ์šฐ์—๋Š” weak reference๋ฅผ ํ†ตํ•ด์„œ delegate์™€ dataSource๋กœ ๋“ค๊ณ  ์žˆ์„ ์ˆ˜ ์žˆ๋‹ค. ํ•˜์ง€๋งŒ ํ…Œ์ด๋ธ” ๋ทฐ๋Š” ์ž์‹ ์˜ ์ปจํŠธ๋กค๋Ÿฌ์— ๋Œ€ํ•ด์„œ ์•Œ์ง€ ๋ชปํ•ฉ๋‹ˆ๋‹ค. 

 

 

โœ… When should you use it?

 

iOS ์•ฑ ์ƒ์„ฑ์˜ ์‹œ์ž‘์ ์œผ๋กœ ์ด์šฉํ•˜์ž!!

๊ฑฐ์˜ ๋ชจ๋“  ์•ฑ์—์„œ MVC์™ธ์— ๋‹ค๋ฅธ ํŒจํ„ด๋“ค์ด ํ•„์š”ํ•  ์ˆ˜ ์žˆ์–ด์„œ ๋‹ค๋ฅธ ํŒจํ„ด์„ ์ถ”๊ฐ€ํ•ด๋„ ๋œ๋‹ค.

 

 

 

โœ… Playground example

 

์•„๋ž˜๋Š” ์ฝ”๋“œ์ด๋‹ค.

MVCํŒจํ„ด์€ ์ •๋ง ๋Œ€ํ‘œ์ ์ธ ํŒจํ„ด์ด๋ผ ํŠน๋ณ„ํžˆ ์–ด๋ ค์šด ์ ์€ ์—†์—ˆ๋‹ค.

 

https://github.com/lgvv/DesignPattern/tree/main/model-view-controller-pattern/RabbleWabble

 

GitHub - lgvv/DesignPattern: โœจ ๋””์ž์ธ ํŒจํ„ด์„ ๊ณต๋ถ€ํ•ฉ๋‹ˆ๋‹ค!

โœจ ๋””์ž์ธ ํŒจํ„ด์„ ๊ณต๋ถ€ํ•ฉ๋‹ˆ๋‹ค! Contribute to lgvv/DesignPattern development by creating an account on GitHub.

github.com

 

์œ„์˜ ํŒŒ์ผ์— ๋Œ€ํ•œ Class Diagram

 

๊ฐ€์žฅ ์Šคํƒ ๋‹ค๋“œํ•˜๊ฒŒ ๊ทธ๋ฆฐ ํด๋ž˜์Šค ๋‹ค์ด์–ด๊ทธ๋žจ

 

(์ถ”๊ฐ€์ž๋ฃŒ) 

์•„๋ž˜๋Š” raywenderlich์˜ ๋‹ค๋ฅธ ๊ธ€์„ ๊ธฐ๋ฐ˜์œผ๋กœ ์ž‘์„ฑํ•œ ๊ธ€์ž…๋‹ˆ๋‹ค.

https://www.raywenderlich.com/1000705-model-view-controller-mvc-in-ios-a-modern-approach

 

Model-View-Controller (MVC) in iOS – A Modern Approach

Learn some tips and tricks to go one up on MVC, Apple’s recommended architecture pattern, and modify your code to be scalable and extensible!

www.raywenderlich.com

 

MVC๋ฅผ ์ ˆ๋Œ€ ๊นจ์„œ๋Š” ์•ˆ๋˜๋Š” ์—„๊ฒฉํ•œ ๊ทœ์น™์œผ๋กœ ์ ‘๊ทผํ•˜๋Š”๊ฒŒ ์•„๋‹ˆ๋ผ, ํ•˜๋‚˜์˜ ํŒจํ„ด์œผ๋กœ์„œ ์ทจ๊ธ‰ํ•˜๋Š” ๋ฐฉ๋ฒ•์œผ๋กœ ๊ณต๋ถ€ํ•˜์ž.

 

โœ… The Model(M)

๋ชจ๋ธ์€ ์•ฑ์˜ ๋ฐ์ดํ„ฐ๋“ค์„ ํฌ๊ด„ํ•˜๊ณ  ์žˆ์œผ๋ฉฐ, ๋‹ค๋ฅธ ํด๋ž˜์Šค๋‚˜ ํ”„๋กœ์ ํŠธ์˜ ๊ฐ์ฒด๋„ ๋ชจ๋ธ์—์„œ ํฌํ•จํ•  ์ˆ˜ ์žˆ๋‹ค.

 

 - Network Code : ๋„คํŠธ์›Œํฌ ํ†ต์‹ ์€ ๋‹จ์ผ ํด๋ž˜์Šค์—์„œ ์‚ฌ์šฉํ•˜๋Š” ๊ฒƒ์ด ์ข‹์œผ๋ฉฐ, HTTP ํ—ค๋”, ์‘๋‹ต ๋ฐ ์˜ค๋ฅ˜ ์ฒ˜๋ฆฌ ๋“ฑ ๋ชจ๋“  ๋„คํŠธ์›Œํ‚น ์š”์ฒญ์— ๊ณตํ†ต๋˜๋Š” ๊ฐœ๋…์„ ์ถ”์ƒํ™”ํ•  ์ˆ˜ ์žˆ๋„๋ก ํ•จ

 - Persistence Code : ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค, ์ฝ”์–ด ๋ฐ์ดํ„ฐ, ๋””๋ฐ”์ด์Šค ๋ฐ์ดํ„ฐ๋ฅผ ์ €์žฅํ•  ๋•Œ ์‚ฌ์šฉํ•˜์ž

 - Parsing Code : ๋„คํŠธ์›Œํฌ ์‘๋‹ต์— ๋Œ€ํ•ด์„œ parsingํ•˜๋Š” ๊ฒƒ์„ ๋ชจ๋ธ์— ํฌํ•จํ•˜์ž. JSON ์ธ์ฝ”๋”ฉ/๋””์ฝ”๋”ฉ์„ ํ†ตํ•ด ํŒŒ์‹ฑ์„ ์ฒ˜๋ฆฌํ•œ๋‹ค. ์ด๋ ‡๊ฒŒ ํ•  ๊ฒฝ์šฐ ๋ชจ๋ธ ๊ฐ์ฒด์˜ ์„ธ๋ถ€์‚ฌํ•ญ์„ ์•Œ ํ•„์š”๊ฐ€ ์—†์–ด์„œ ๋น„์ฆˆ๋‹ˆ์Šค ๋กœ์ง๊ณผ parsing์„ ๋ชจ๋ธ์—์„œ ์ฒ˜๋ฆฌํ•ฉ๋‹ˆ๋‹ค.

 - Managers and abstraction layers/classes : ๋ชจ๋‘๊ฐ€ ์‚ฌ์šฉํ•˜๊ณ , ํ•„์š”๋กœํ•˜๋ฉฐ ๊ทธ๋Ÿฌ๋‚˜ ๊ทธ ๋ˆ„๊ตฌ๋„ ๋ฌด์—‡์ด๋ผ๊ณ  ๋ถˆ๋Ÿฌ์•ผํ• ์ง€ ๋ชจ๋ฆ…๋‹ˆ๋‹ค. Mangers๊ฐ€ ๋‹ค๋ฅธ ํด๋ž˜์Šค๊ฐ„์— ์ ‘์ฐฉ์ œ ์—ญํ• ์„ ํ•˜๊ธฐ๋„ ํ•ฉ๋‹ˆ๋‹ค. ๋˜ํ•œ ํ•˜์œ„ ์ˆ˜์ค€์„ ๋ž˜ํ•‘ํ•˜์—ฌ iOS ํ‚ค์ฒด์ธ, HealthKit๊ณผ ํ•จ๊ป˜ ์ž‘์—…ํ•  ์ˆ˜๋„ ์žˆ์Šต๋‹ˆ๋‹ค.

 - Data sources and delegates : ๋ชจ๋ธ ๊ฐ์ฒด์— ์˜์กดํ•˜๋Š” ๊ฒƒ์ด ๊ฐœ๋ฐœ์ž๋“ค์—๊ฒŒ ๋œ ํ”ํ•œ ๋ฐฉ๋ฒ•์ด๋‹ค. ๋น„์ฆˆ๋‹ˆ์Šค ๋กœ์ง์€ ๋ชจ๋ธ์—์„œ ์ฒ˜๋ฆฌํ•˜์ž๊ณ  ์ด์•ผ๊ธฐ๋ฅผ ํ•˜์˜€์œผ๋‚˜, ๋Œ€๋ถ€๋ถ„์˜ ๊ฒฝ์šฐ์— ๊ฐœ๋ฐœ์ž๋“ค์€ ์ปจํŠธ๋กค๋Ÿฌ์—์„œ ๊ตฌํ˜„ํ•ฉ๋‹ˆ๋‹ค.

 - Constants : ์ƒ์ˆ˜๋ฅผ ๋ชจ๋ธ์— ๊ฐ€์ง€๋ฉด ์Šคํ† ๋ฆฌ๋ณด๋“œ ์ด๋ฆ„, ๋‚ ์งœ ํฌ๋งทํ„ฐ, ์ƒ‰์ƒ ๋“ฑ์„ ์žฌ์‚ฌ์šฉ ํ•  ์ˆ˜ ์žˆ๋‹ค.

 - Helpers and extensions : ํ”„๋กœ์ ํŠธ์—์„œ ๋ฌธ์ž์—ด ๋ชจ์Œ ๋“ฑ์˜ ๊ธฐ๋Šฅ์„ ์ถ”๊ฐ€ํ•˜๋Š” ๊ฒƒ๋„ ์ด ์—ญ์‹œ ๋ชจ๋ธ์˜ ์ผ๋ถ€๋กœ ๊ฐ„์ฃผ๋œ๋‹ค.

 

ํฌํ•จํ•  ์ˆ˜ ์žˆ๋Š” ๋” ๋งŽ์€ ์ผ€์ด์Šค๊ฐ€ ์žˆ์ง€๋งŒ, ์œ„์— ๊ฒƒ๋“ค์ด ๊ฐ€์žฅ ํ”ํ•œ ์˜ˆ์‹œ์ด๋‹ค.

ํ…Œ์ŠคํŠธ ๊ด€์ ์—์„œ ๋ชจ๋ธ์„ ๊ฐ€์žฅ ์ข‹์€ ํ›„๋ณด์ธ๋ฐ, ๋น„์ฆˆ๋‹ˆ์Šค ๋กœ์ง, ๋„คํŠธ์›Œํ‚น, persistence ๋ฉ”์†Œ๋“œ ๋“ฑ์„ ์ค‘์š”ํ•œ ๋ถ€๋ถ„์„ ์ค‘์‹ฌ์œผ๋กœ ํ…Œ์ŠคํŠธ๋ฅผ ์ถ”๊ฐ€ํ•  ์ˆ˜ ์žˆ๋‹ค.

 

 

โœ… The View(V)

์‚ฌ์šฉ์ž๊ฐ€ ์•ฑ๊ณผ ์ƒํ˜ธ ์ž‘์šฉํ•  ๋•Œ ์ธํ„ฐ๋ž™ํŒ…ํ•˜๋Š” ๋ถ€๋ถ„์ด๋‹ค. ์–ด๋– ํ•œ ๋น„์ฆˆ๋‹ˆ์Šค ๋กœ์ง๋„ ํฌํ•จ๋˜๋ฉด ์•ˆ๋œ๋‹ค.

 

์ผ๋ฐ˜์ ์œผ๋กœ View์—์„œ code smell์ด ์—ฌ๋Ÿฌ ํ˜•ํƒœ๋กœ ๋ฐœ๊ฒฌ๋œ๋‹ค. UI๋ฅผ ๊ตฌ์„ฑํ•˜๊ธฐ ์œ„ํ•ด, ๋„คํŠธ์›Œํฌ๋‚˜ ๋น„์ฆˆ๋‹ˆ์Šค ๋กœ์ง ๋ชจ๋ธ์„ ์กฐ์ •ํ•˜๋Š” ๋“ฑ์ด ๋‚˜ํƒ€๋‚˜๋Š”๋ฐ ๊ทธ๋ ‡์ง€ ์•Š๋„๋ก ์ฃผ์˜ํ•˜์ž.

 

View๋ฅผ ๊ตฌ์„ฑํ•˜๋Š”๋ฐ ์ฒดํฌ๋ฆฌ์ŠคํŠธ๋กœ ์‚ฌ์šฉํ•˜์ž. ( ๋ชจ๋‘ no๋กœ ๋Œ€๋‹ตํ•  ์ˆ˜ ์žˆ๋„๋ก )  

  - ๋ชจ๋ธ ๋ ˆ์ด์–ด์™€ ์†Œํ†ตํ•˜๊ณ  ์žˆ๋Š”๊ฐ€?
  - ๋น„์ง€๋‹ˆ์Šค ๋กœ์ง์„ ํฌํ•จํ•˜์˜€๋Š”๊ฐ€?
  - UI์™€ ๊ด€๋ จํ•˜์ง€ ์•Š์€ ๊ฒƒ๋“ค์ด ์žˆ๋Š”๊ฐ€?

 

โœ… The Controller(C)

์ปจํŠธ๋กค๋Ÿฌ๋Š” domain-specific rules์„ ๊ฐ–๋Š” ๊ฒฝ์šฐ๊ฐ€ ๋งŽ์•„์„œ ์•ฑ์—์„œ ๊ฑฐ์˜ ์žฌ์‚ฌ์šฉํ•  ์ˆ˜ ์—†๋‹ค.

 

์ผ๋ฐ˜์ ์œผ๋กœ ์•„๋ž˜ ๋™์ž‘์„ ๊ฒฐ์ •ํ•˜๋Š” ๊ฒƒ๋“ค์€ controller๋กœ ๋ณผ ์ˆ˜ ์žˆ๋‹ค.

 - ์ง€์†์„ฑ ๋˜๋Š” ๋„คํŠธ์›Œํฌ ์ค‘ ์–ด๋–ค๊ฒƒ์„ ๋จผ์ € ์—‘์„ธ์Šค ํ•ด์•ผ ํ•˜๋Š”๊ฐ€?

 - ์–ผ๋งˆ๋‚˜ ์ž์ฃผ ์•ฑ์„ ์ƒˆ๋กœ๊ณ ์นจ ํ•ด์•ผ ํ• ๊นŒ?

 - ๋‹ค์Œ ํ™”๋ฉด์€ ์–ด๋–ค ์ƒํ™ฉ์ด์–ด์•ผ ํ• ๊นŒ?

 - ์•ฑ์ด ๋ฐฑ๊ทธ๋ผ์šด๋“œ๋กœ ๊ฐ€๋ฉด ๋ญ˜ ์ •๋ฆฌํ•ด์•ผ ํ• ๊นŒ?

 - ์‚ฌ์šฉ์ž๊ฐ€ ์…€์„ ๋ˆŒ๋ €๋Š”๋ฐ ๋‹ค์Œ์—๋Š” ์–ด๋–ป๊ฒŒ ํ•ด์•ผ ํ• ๊นŒ?

 

์ปจํŠธ๋กค๋Ÿฌ ๊ณ„์ธต์€ ์•ฑ์˜ ๋‘๋‡Œ ๋˜๋Š” ์—”์ง„์œผ๋กœ ์ƒ๊ฐํ•˜๋ฉฐ, ๋‹ค์Œ์— ์–ด๋–ค ์ผ์ด ์ผ์–ด๋‚ ์ง€ ๊ฒฐ์ •ํ•˜์ž.

๋Œ€๋ถ€๋ถ„์˜ ๊ฒฝ์šฐ ์ปจํŠธ๋กค๋Ÿฌ ๊ณ„์ธต์—์„œ ์ž‘์—… ์‹œ์ž‘, ๋ฐ์ดํ„ฐ ๋กœ๋“œ ํŠธ๋ฆฌ๊ฑฐ, UI ์ƒํ˜ธ ์ž‘์šฉ ์ฒ˜๋ฆฌ, UI์™€ ๋ชจ๋ธ ์‚ฌ์ด์˜ ๋ฐ์ดํ„ฐ ์กฐ์ • ๋•Œ๋ฌธ์— ํ…Œ์ŠคํŠธ๋ฅผ ์ˆ˜ํ–‰ํ•˜์ง€ ์•Š์„ ์ˆ˜๋„ ์žˆ๋‹ค.

 

 

 

(์ฐธ๊ณ )

์• ํ”Œ์˜ MVC ํŒจํ„ด์— ๋Œ€ํ•œ ๋ฌธ์„œ

https://developer.apple.com/library/archive/documentation/General/Conceptual/CocoaEncyclopedia/Model-View-Controller/Model-View-Controller.html

 

Model-View-Controller

Model-View-Controller The Model-View-Controller design pattern (MVC) is quite old. Variations of it have been around at least since the early days of Smalltalk. It is a high-level pattern in that it concerns itself with the global architecture of an applic

developer.apple.com

 

delegation pattern

2022.04.10 - [iOS/DesignPattern] - [Swift] Delegation Pattern

 

[Swift] Delegation Pattern

Delegation Pattern โœ… Delegation Pattern ์•„๋ž˜์˜ ๋ฌธ์„œ๋ฅผ ๊ตฌ์ž…ํ•˜์—ฌ ์ง์ ‘ ๋ฒˆ์—ญ ๋ฐ ์ •๋ฆฌํ•ฉ๋‹ˆ๋‹ค. https://www.raywenderlich.com/books/design-patterns-by-tutorials/v3.0/chapters/4-delegation-pattern Design P..

rldd.tistory.com

 

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