import UIKit class UIViewOverrideTest: UIView { override init(frame: CGRect) { super.init(frame: frame) } // これを実装しないとエラーになる required init(coder aDecoder: NSCoder) { super.init(coder: aDecoder) } /* // Only override drawRect: if you perform custom drawing. // An empty implementation adversely affects performance during animation. override func drawRect(rect: CGRect) { // Drawing code } */ }