python - Opencv和python参数中的方括号

方括号表示可选参数。只有在输入前面的可选参数时，才能输入一些可选参数。例如，如果您尚未输入equal to or greater then 0和struct MenuTableCellContents { var identifier: cellIdentifier var cellImage: UIImage var cellText: String //var cellFont: UIFont var cellTextColor: UIColor var subCells: [MenuTableCellContents]? /// Normal cells without subcells init(identifier: cellIdentifier, cellImage: UIImage, cellText: String, /*cellFont: UIFont,*/ cellTextColor: UIColor) { self.identifier = identifier self.cellImage = cellImage self.cellText = cellText self.cellTextColor = cellTextColor //self.cellFont = cellFont } /// Cells with subcells init(identifier: cellIdentifier, cellImage: UIImage, cellText: String, /*cellFont: UIFont,*/ cellTextColor: UIColor, subCells: [MenuTableCellContents]) { self.identifier = identifier self.cellImage = cellImage self.cellText = cellText self.cellTextColor = cellTextColor //self.cellFont = cellFont self.subCells = subCells } enum cellIdentifier { case standard case noIcon case subcell } } class MenuTableCell: UITableViewCell { @IBOutlet var cell_icon: UIImageView! @IBOutlet var cell_label: UILabel! @IBOutlet var cell_contentView: UIView! @IBOutlet var cell_contentView_height: NSLayoutConstraint! var cellImage: UIImage? var cellText: String? var cellTextColor: UIColor? //var cellFont: UIFont? var subCells: [MenuTableCellContents]? private var contentViewHeight: CGFloat? override func draw(_ rect: CGRect) { drawSubCells() cell_label.text = cell_label.text?.uppercased() super.draw(rect) } /// draw the subcells when needed func drawSubCells() { // Check if there are subcells if let cells = subCells { let count = CGFloat(cells.count) // Set the height for the subcells contentViewHeight = 40 * count let contentViewFrame = CGRect(x: self.frame.width, y: self.cell_contentView.frame.origin.y, width: self.frame.width, height: contentViewHeight!) cell_contentView?.frame = contentViewFrame var i = 0 for cell in cells { // create a view for each cell let cellView = UIView() let cellFrame = CGRect(x: 0, y: CGFloat(i * 40), width: contentViewFrame.width, height: 40) cellView.frame = cellFrame // add a image view to each cell let imageView = UIImageView(image: cell.cellImage) let imageViewFrame = CGRect(x: 0, y: (cellFrame.height - cellFrame.height / 2) / 2, width: cellFrame.width * 0.2, height: cellFrame.height / 2) imageView.frame = imageViewFrame imageView.contentMode = .scaleAspectFit // add a button to each cell let cellLabel = UILabel() let cellLabelFrame = CGRect(x: imageViewFrame.width, y: 0, width: cellFrame.width - imageViewFrame.width, height: 40) cellLabel.frame = cellLabelFrame //cellLabel.font = cell.cellFont cellLabel.text = cell.cellText.uppercased() cellLabel.textColor = cell.cellTextColor cellLabel.minimumScaleFactor = 15 // add the imageview and button to the subcell view cellView.addSubview(imageView) cellView.addSubview(cellLabel) // add the subcell to the cell cell_contentView?.addSubview(cellView) i += 1 } setupConstraints(height: contentViewHeight!) } } /// Set the height constraint for the cell content view in which the subcells reside func setupConstraints(height: CGFloat) { cell_contentView.frame.size.height = height } }，则无法输入class MenuViewController: UIViewController, UITableViewDelegate { @IBOutlet var menu_table: MenuTableView! var cellContent: [MenuTableCellContents] = [] override func viewDidLoad() { super.viewDidLoad() setupCells() let menuCell = UINib(nibName: "MenuTableCell", bundle: nil) menu_table.register(menuCell, forCellReuseIdentifier: "menuCell") menu_table.delegate = self menu_table.dataSource = self menu_table.rowHeight = UITableViewAutomaticDimension menu_table.estimatedRowHeight = 50 self.revealViewController().frontViewShadowRadius = 0 self.revealViewController().frontViewShadowOffset = CGSize.zero } /// setup the required cells for the menu func setupCells() { let normal1 = MenuTableCellContents(identifier: .standard, cellImage: UIImage(named: "icn_pin")!, cellText: "normal1", cellTextColor: UIColor.black) let normal2 = MenuTableCellContents(identifier: .standard, cellImage: UIImage(named: "icn_pin")!, cellText: "normal2", cellTextColor: UIColor.black) let normal3 = MenuTableCellContents(identifier: .standard, cellImage: UIImage(named: "icn_pin")!, cellText: "normal3", cellTextColor: UIColor.black) let sub1 = MenuTableCellContents(identifier: .subcell, cellImage: UIImage(named: "icn_pin")!, cellText: "sub1", cellTextColor: UIColor.black) let sub2 = MenuTableCellContents(identifier: .subcell, cellImage: UIImage(named: "icn_pin")!, cellText: "sub2", cellTextColor: UIColor.black) let sub3 = MenuTableCellContents(identifier: .subcell, cellImage: UIImage(named: "icn_pin")!, cellText: "sub3", cellTextColor: UIColor.black) let subs = MenuTableCellContents(identifier: .standard, cellImage: UIImage(named: "icn_pin")!, cellText: "subs", cellTextColor: UIColor.black, subCells: [sub1, sub2, sub3]) let normal4 = MenuTableCellContents(identifier: .standard, cellImage: UIImage(named: "icn_pin")!, cellText: "normal4", cellTextColor: UIColor.black) cellContent = [normal1, normal2, normal3, subs, normal4] } } /// required methods for the uitableview extension MenuViewController: UITableViewDataSource { func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return cellContent.count } func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let content = cellContent[indexPath.item] let cell = menu_table.dequeueReusableCell(withIdentifier: "menuCell", for: indexPath) as! MenuTableCell cell.cell_icon.image = content.cellImage cell.cell_label.text = content.cellText cell.cell_label.textColor = content.cellTextColor //cell.cell_label.font = content.cellFont if let subCells = content.subCells { cell.subCells = subCells } return cell } func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { } func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat { return UITableViewAutomaticDimension } }参数。这解释了为什么在功能描述中你有几个括号在你可以关闭它们之前打开。

Opencv和python参数中的方括号

1 个答案: