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UTextFieldのソフトキーボードを数値のみにして完了ボタンを追加する

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UITextFieldやUITextViewのkeyboardTypeをnumberPadにした場合に
ソフトキーボードに完了キーが無くて困ったので追加方法を共有します。

let toolbar: UIToolbar = UIToolbar()
let space = UIBarButtonItem(barButtonSystemItem: .flexibleSpace,
                            target: nil,
                            action: nil)
let done = UIBarButtonItem(title: "done",
                           style: .done,
                           target: self,
                           action: #selector(doSomething))
toolbar.items = [space, done]
toolbar.sizeToFit()
self.textField.inputAccessoryView = toolbar
self.textField.keyboardType = .numberPad

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