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self.navigationController?.interactivePopGestureRecognizer?.isEnabled = false

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// Set textfield max length
private var __maxLengths = [UITextField: Int]()
extension UITextField {
    @IBInspectable var maxLength: Int {
        get {
            guard let l = __maxLengths[self] else {
                return Int.max // (global default-limit. or just, Int.max)
            }
            return l
        }

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// MARK: - View Lifecycle
override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    self.navigationController?.interactivePopGestureRecognizer?.delegate = self
}

// MARK: - UIGestureRecognizerDelegate
extension MyViewController: UIGestureRecognizerDelegate {
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldBeRequiredToFailBy otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true

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UIView.setAnimationsEnabled(false) // 我夾
self.tableView.insertRows(at: indexPaths, with: .none)
UIView.setAnimationsEnabled(true) // 我夾

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DispatchQueue.global(qos: .background).async { // 背景線程
  let initialIndex = self.datas.count // 原本已有的 20 筆資料
  var indexPaths: [IndexPath] = [] // 將要加入新項目的懵懂 array
  for index in 0..<newPackOfDatas.count { // 將 indexPaths 加入新的 20 筆資料
      let indexPath = IndexPath(item: initialIndex + index, section: 0) // 注意起始位置是 20（initialIndex 為還沒更新前的資料 count）
      indexPaths.append(indexPath)
  }

  self.datas += newPackOfDatas // 將新的資料加入 datas

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let maskPath = UIBezierPath(roundedRect: view.bounds, byRoundingCorners: [.topLeft, .topRight], cornerRadii: CGSize(width: 5, height: 5))
let maskLayer = CAShapeLayer()
maskLayer.frame = view.bounds
maskLayer.path = maskPath.cgPath
view.layer.mask = maskLayer

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inputTextField.addTarget(self, action: #selector(textFieldDidChange(_:)) , for: UIControlEvents.editingChanged)

@objc func textFieldDidChange(_ textField: UITextField) {
       // text field did change
}

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// Draw dotted line
let viewBorder = CAShapeLayer()
viewBorder.lineDashPattern = [2, 2]
viewBorder.frame = myView.bounds
viewBorder.fillColor = nil
viewBorder.path = UIBezierPath(rect: myView.bounds).cgPath
myView.layer.addSublayer(viewBorder)

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@IBAction func textFieldDidChange(_ sender: UITextField) {
    if let text = sender.text {
        let uppercase = text.uppercased()
        sender.text = uppercase
    }
}

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// Set up the shape of the circle 
CAShapeLayer *border = [CAShapeLayer layer];
border.path = [UIBezierPath bezierPathWithRoundedRect:self.myImageView.frame cornerRadius:self.myImageView.frame.size.height/2].CGPath; 
border.anchorPoint = CGPointMake(0.5, 0.5); 
border.position= CGPointMake(self.myImageView.bounds.origin.x, self.myImageView.bounds.origin.y); 
border.fillColor = [UIColor clearColor].CGColor; 
border.strokeColor = [UIColor blueColor].CGColor; 
border.lineWidth = 5; [self.view.layer addSublayer:border]; 
// Configure animation 
// draw Border