swift ios ResponderChain opaque SERENA BoxedType SwiftConcurrency 야곰아카데미 UIKit Filesystem Xcode aTourSwift boexdtype SwiftPerformance SwfitPerformance DataTask GestuerRecognizer JLife addKeyframe animateKeyframes swift language ArchitecturePattern CollectionView TypeAlias codingtest urlSession usernotification 재사용성 optional appDelegate touchevent UIResponder 재사용 unittest storyboard delegate Markdown init 회고 version SOLID Animate string ascii portfolio udp tcp ip Protocol localization 리뷰