inputViewを使ってカスタムキーボードをつくろう！（Swift） - Qiita

protocol CustomKeyboardViewDelegate: AnyObject { func customKeyboardView(_ customKeyboardView: CustomKeyboardView, didSelectKey key: String) } final class CustomKeyboardView: UIView { weak var delegate: CustomKeyboardViewDelegate? override init(frame: CGRect) { super.init(frame: frame) loadNib() } required init(coder aDecoder: NSCoder) { super.init(coder: aDecoder)! loadNib() } private func loadNi