[swift]建立App內部鍵盤

MyKeyboard.swift

//1
protocol KeyboardDelegate: class {
    func keyWasTapped(input: Int)
}

class MyKeyboard: UIView {
    
    //2
    @IBOutlet weak var Btn1: UIButton!
    @IBOutlet weak var Btn2: UIButton!
    @IBOutlet weak var Btn3: UIButton!
    
    //3
    // 這個Delegate 之後設定給 ViewController
    // 鍵盤就可以給View Controller發訊息
    weak var delegate: KeyboardDelegate?
    
    // MARK:- 鍵盤初始化
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        initializeSubviews()
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        initializeSubviews()
    }
    
    //4
    func initializeSubviews() {
        // 不需包括xib
        let xibFileName = "MyKeyboard"
        let view = Bundle.main.loadNibNamed(xibFileName, owner: self, options: nil)![0] as! UIView
        self.addSubview(view)
        view.frame = self.bounds
    }
    
    // MARK:- .xib 裏按鈕的Action
    
    //5
    @IBAction func keyTapped(sender: UIButton) {
        // 按鈕按下後，發送訊息給
        // delegate (也就是  view controller)
        
        self.delegate?.keyWasTapped(input: sender.tag)
        
        if sender.tag == 0 {
            //6
            Btn1.changeBtn(title: "AA", tag: 10)
            
            Btn2.changeBtn(title: "AB", tag: 11)
            
            Btn3.changeBtn(title: "AC", tag: 12)
        }
        else if sender.tag == 1{
            Btn1.changeBtn(title: "BA", tag: 20)
            
            Btn2.changeBtn(title: "BB", tag: 21)
            
            Btn3.changeBtn(title: "BC", tag: 22)
        }
        else if sender.tag == 5 {
            Btn1.changeBtn(title: "A", tag: 0)
            
            Btn2.changeBtn(title: "B", tag: 1)
            
            Btn3.changeBtn(title: "C", tag: 2)
        }
    }
}