SimpleTunnel/ConfigurationParametersViewController.swift

/*
    Copyright (C) 2016 Apple Inc. All Rights Reserved.
    See LICENSE.txt for this sample’s licensing information
    
    Abstract:
    This file contains the ConfigurationParametersViewController, which is a UITableViewController sub-class that contains a table of configuration parameters.
*/
 
import UIKit
 
/// A table view controller for a view that contains a table of configuration parameter input fields.
class ConfigurationParametersViewController: UITableViewController {
 
    // MARK: Properties
 
    /// The cells to display in the table.
    var cells = [UITableViewCell]()
 
    // MARK: UITableViewDataSource
 
    /// Returns the number of sections in the table (always 1).
    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
 
    /// Returns the number of cells currently in the cells list.
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return cells.count
    }
 
    /// Returns the cell at the given index in the cells list.
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        return cells[(indexPath as NSIndexPath).row]
    }
 
    // MARK: Interface
 
    /// Insert or remove cells into the cells list per the current value of a SwitchCell object.
    func updateCellsWithDependentsOfCell(_ cell: SwitchCell) {
        if let indexPath = getIndexPathOfCell(cell)
            , !cell.dependentCells.isEmpty
        {
            let index = (indexPath as NSIndexPath).row + 1
            if cell.isOn {
                cells.insert(contentsOf: cell.dependentCells, at: index)
            }
            else {
                let removeRange = index..<(index + cell.dependentCells.count)
                cells.removeSubrange(removeRange)
            }
        }
    }
 
    /// Return the index of a given cell in the cells list.
    func getIndexPathOfCell(_ cell: UITableViewCell) -> IndexPath? {
        if let row = cells.index(where: { $0 == cell }) {
            return IndexPath(row: row, section: 0)
        }
        return nil
    }
 
    /// Construct a description string for a list of items, given a description of a single item.
    func getDescriptionForListValue(_ listValue: [AnyObject]?, itemDescription: String, placeHolder: String = "Optional") -> String {
        if let list = listValue , !list.isEmpty {
            return "\(list.count) \(itemDescription)" + (list.count > 1 ? "s" : "")
        } else {
            return placeHolder
        }
    }
 
    /// Construct a description string for a list of strings, given a description of a single string.
    func getDescriptionForStringList(_ stringList: [String]?, itemDescription: String, placeHolder: String = "Optional") -> String {
        if let list = stringList , !list.isEmpty {
            
            return (list.count <= 3 ? list.joined(separator: ", ") : "\(list.count) \(itemDescription)s")
        } else {
            return placeHolder
        }
    }
}


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