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์ฑ์ ์ํ ๋ฐ๋ผ ์ํํด์ผํ ์ผ๋ค์ด ์๋ค.
์ด ๋ iOS App Lifecycle ์ UIApplicationDelegate ํจ์๋ค์ ์ด์ฉํด์ ์ฒ๋ฆฌํด์ฃผ์.
https://developer.apple.com/documentation/uikit/app_and_environment/managing_your_app_s_life_cycle
Managing your app’s life cycle | Apple Developer Documentation
Respond to system notifications when your app is in the foreground or background, and handle other significant system-related events.
developer.apple.com
https://developer.apple.com/documentation/uikit/uiapplicationdelegate
UIApplicationDelegate | Apple Developer Documentation
A set of methods to manage shared behaviors for your app.
developer.apple.com
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