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iOS Build a Vending Machine App in Swift 2.0 Loading Data From a Resource Finishing Touches

Adam Young
Adam Young
4,147 Points

App crashing when launching


I got to the end of the video where it was time to launch the project and it crashed upon launching. On line 37 (setupCollectionViewCells() ) it says Thread 1 breakpoint 2.1

I will paste my code below. I would appreciate it if someone can help me out.

let vendingMachine: VendingMachineType

required init?(coder aDecoder: NSCoder) {
    do {
        let dictionary = try PlistConverter.dictionaryFromFile("VendingInventory", ofType: "plist")
        let inventory = try InventoryUnarchiver.vendingInventoryFromDictionary(dictionary)
        self.vendingMachine = VendingMachine(inventory: inventory)
    } catch let error {
    super.init(coder: aDecoder)

override func viewDidLoad() {
    // Do any additional setup after loading the view, typically from a nib.

override func didReceiveMemoryWarning() {
    // Dispose of any resources that can be recreated.

// MARK: - UICollectionView 

func setupCollectionViewCells() {
    let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
    layout.sectionInset = UIEdgeInsets(top: 20, left: 0, bottom: 10, right: 0)
    let padding: CGFloat = 10
    layout.itemSize = CGSize(width: (screenWidth / 3) - padding, height: (screenWidth / 3) - padding)
    layout.minimumInteritemSpacing = 10
    layout.minimumLineSpacing = 10

    collectionView.collectionViewLayout = layout

func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 12



2 Answers


You might have set a breaking point without noticing. Press "⌃⌘Y" to continue. If you have any error message logged out, paste it here.

Adam Young
Adam Young
4,147 Points


This is what it says in the debug area:

self VendingMachine.ViewController 0x00007fb71073f360 UIKit.UIViewController UIViewController
collectionView UICollectionView! 0x00007fb712031a00 totalLabel UILabel! 0x00007fb710682f10 balanceLabel UILabel! 0x00007fb7104328c0 quantityLabel UILabel! 0x00007fb7106823f0 vendingMachine VendingMachine.VendingMachine 0x00007fb710743fe0

Thanks, Adam

Hi, Adam.

Unfortunately, that doesn't tell me much.

I took a second look at your code and compared it with the file the teacher provides and it seems like you're missing a few lines of code and one of them is wrong.

I recommend downloading the file, from the downloads section below the video, and compare. Even though it might take you 10-15 minutes to catch the error, I strongly encourage you to do so as these experiences will truly help you out in the future.

Best of luck. :)