[iOS] UITextField extension으로 구현할 때 NSObject를 상속해야하는 이유

 

https://stackoverflow.com/questions/40705591/class-does-not-conform-nsobjectprotocol

 

https://stackoverflow.com/questions/24650325/why-in-swift-we-cannot-adopt-a-protocol-without-inheritance-a-class-from-nsobjec

 

https://stackoverflow.com/questions/33006082/swift-reusable-uitextfielddelegate