use `extension` for delegate
use `extension` for delegate

Sam-WEI/SwiftWeatherFork,JakeLin/SwiftWeather,Sam-WEI/SwiftWeatherFork,Crisfole/SwiftWeather,Crisfole/SwiftWeather,askken/SwiftWeather,Crisfole/SwiftWeather,askken/SwiftWeather,JakeLin/SwiftWeather,Sam-WEI/SwiftWeatherFork,JakeLin/SwiftWeather