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

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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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// 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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self.navigationController?.interactivePopGestureRecognizer?.isEnabled = false

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class LeftAlignedCollectionViewFlowLayout: UICollectionViewFlowLayout {

    override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
        let attributes = super.layoutAttributesForElements(in: rect)

        var leftMargin = sectionInset.left
        var maxY: CGFloat = -1.0
        attributes?.forEach { layoutAttribute in
            if layoutAttribute.frame.origin.y >= maxY {
                leftMargin = sectionInset.left

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static func generateQRCode(from string: String, imageView: UIImageView) -> UIImage? {
        let data = string.data(using: String.Encoding.ascii)
        
        if let filter = CIFilter(name: "CIQRCodeGenerator") {
            filter.setValue(data, forKey: "inputMessage")
            // L: 7%, M: 15%, Q: 25%, H: 30%
            filter.setValue("M", forKey: "inputCorrectionLevel")
            
            if let qrImage = filter.outputImage {
                let scaleX = imageView.frame.size.width / qrImage.extent.size.width

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enum SectionType: Int {
    case header = 0
    case list
    
    static let count: Int = {
        var max: Int = 0
        while let _ = SectionType(rawValue: max) { max += 1 }
        return max
    }()
}

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enum SectionType: Int {
    case header = 0
    case list
    
    static let count = 2
}

print(SectionType.count) // 2