wingchi

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, 
                    sizeForItemAt indexPath: IndexPath) -> CGSize {
    return gridViewModel.cellSize(for: collectionView.bounds, at: indexPath)
}

wingchi

import UIKit

class GridViewModel {
    static var itemMargin: CGFloat = 8.0
    var data: [Int] = (1...10).map { $0 }
    
    func cellSize(for frame: CGRect, at indexPath: IndexPath) -> CGSize {
        let height = (frame.height / 5) - 2 * GridViewModel.itemMargin
        let fullWidth = frame.width
        let halfWidth = (frame.width / 2) - (GridViewModel.itemMargin / 2)

wingchi

class GridViewModelTests: XCTestCase {
    let testFrame = CGRect(x: 0, y: 0, width: 72, height: 130)
    let expectedFullWidth: CGFloat = 72 // 72
    let expectedHalfWidth = (72 / 2) - (GridViewModel.itemMargin / 2) //32
    let expectedHeight = (130 / 5) - 2 * GridViewModel.itemMargin //10
    
    // ... tests one through five
    
    func testSixItemCellSize() {
        let expectedCellSizes = [

wingchi

func cellSize(for frame: CGRect, at indexPath: IndexPath) -> CGSize {
    let height = (frame.height / 5) - 2 * GridViewModel.itemMargin
    let fullWidth = frame.width - 2 * GridViewModel.itemMargin

    return CGSize(width: fullWidth, height: height)
}

wingchi

class GridViewModelTests: XCTestCase {
    let testFrame = CGRect(x: 0, y: 0, width: 72, height: 130)
    let expectedFullWidth: CGFloat = 72 // 72
    let expectedHeight = (130 / 5) - 2 * GridViewModel.itemMargin //10
    
    func testOneItemCellSize() {
        let expectedCellSize = CGSize(width: expectedFullWidth, height: expectedHeight)
        let viewModel = GridViewModel()
        viewModel.data = [1]
        let row = 0

wingchi

import UIKit

class GridViewModel {
    static var itemMargin: CGFloat = 8.0
    var data: [Int] = (1...10).map { $0 }
    
    func cellSize(for frame: CGRect, at indexPath: IndexPath) -> CGSize {
        return CGSize(width: 0, height: 0)
    }
}

wingchi

import UIKit

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {

    @IBOutlet weak var collectionView: UICollectionView!
    
    private let gridViewModel = GridViewModel()

    override func viewDidLoad() {
        super.viewDidLoad()

wingchi

$oneString = array("", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine");
$tenString = array("", "ten", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety", "one hundred");
$teenString = array("", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen");

for ($count = 100; $count > 0; --$count) {
    $next = $count - 1;
    $count_text = (!($count>10 && $count<20) ? $tenString[$count/10] . (($count%10 != 0 && $count>9) ? " " : "") . $oneString[$count%10] : $teenString[$count-10]);
    $next_text = (!($next>10 && $next<20) ? $tenString[$next/10] . (($next%10 != 0 && $next > 9) ? " " : "") . $oneString[$next%10] : $teenString[$next-10]);
    print (ucFirst($count_text). " bottles of beer on the wall, " . $count_text . " bottles of beer! Take one down, and pass it around; " . $next_text . " bottles of beer on the wall!