SwiftExample.swift

//
//  TableViewController.swift
//  ColouredRose2
//
//  Created by Vincent O'Sullivan on 08/04/2015.
//  Copyright (c) 2015 Vincent O'Sullivan. All rights reserved.
//

import UIKit

class TableViewController: UITableViewController {

    let maxSections =  8
    let maxRows     = 10

    // MARK: - TableView functions

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return maxSections
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return maxRows
    }

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! UITableViewCell
        cell.textLabel?.text = "Section \(indexPath.section), row \(indexPath.row)."
        cell.backgroundColor = colourForIndexPath(indexPath)
        return cell
    }

    override func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        return "Section \(section)."
    }

    // MARK: - Internal functions

    private func colourForIndexPath(indexPath:NSIndexPath) -> UIColor {
        let row     = CGFloat(indexPath.row)
        let section = CGFloat(indexPath.section)

        let saturation = 1.0 - row / CGFloat(maxRows)
        let hue        = section / CGFloat(maxSections)

        return UIColor(hue: hue, saturation: saturation, brightness: 1.0, alpha: 1.0)
    }
}