UICollectionView以编程方式

我在故事板中创建了自己的窗口，如下所示：

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { // Override point for customization after application launch. window = UIWindow(frame: UIScreen.main.bounds) window?.makeKeyAndVisible() window?.rootViewController = UINavigationController(rootViewController: HomeController()) return true } 

当我的类inheritanceUIViewController时，这实际上工作正常。

 class HomeController: UIViewController { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. view.backgroundColor = UIColor.red } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } } 

现在，当我用UICollectionViewController子类化我的类时：

 class HomeController: UICollectionViewController { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. Collectionview.backgroundColor = UIColor.red } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } } 

在运行时它给我一个错误说：

由于未捕获的exception’NSInvalidArgumentException’而终止应用程序，原因：’UICollectionView必须使用非零布局参数初始化’***首先抛出调用堆栈：

根据我的理解，它要求我为UICollectionView提供布局。如果我错了，请在这里告诉我。所以我试过这个 – ：

 func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { // Override point for customization after application launch. window = UIWindow(frame: UIScreen.main.bounds) window?.makeKeyAndVisible() let layout = UICollectionViewFlowLayout() window?.rootViewController = UINavigationController(rootViewController: HomeController(UICollectionViewLayout: layout)) return true } 

但仍然以错误结束：

参数标签’UICollectionViewLayout’与任何可用的重载都不匹配。

我使用了错误的swift3语法吗？ 如果是，解决这个问题是正确的。

Answer 1

您需要使用UICollectionViewController的指定intialiser，如下所示。

 let layout = UICollectionViewLayout() let homeViewController = HomeController(collectionViewLayout: layout) window?.rootViewController = UINavigationController(rootViewController: homeViewController) 

除此之外，您还需要修改HomeViewController以实现UICollectionViewDataSource所需的方法。

 override func viewDidLoad() { super.viewDidLoad() // Uncomment the following line to preserve selection between presentations // self.clearsSelectionOnViewWillAppear = false // Register cell classes self.collectionView!.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "Cell") // Do any additional setup after loading the view. } // MARK: UICollectionViewDataSource override func numberOfSections(in collectionView: UICollectionView) -> Int { // #warning Incomplete implementation, return the number of sections return 0 } override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { // #warning Incomplete implementation, return the number of items return 0 } override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) // Configure the cell return cell } 

Answer 2

您需要在UICollectionViewFlowLayout中实现UICollectionViewController 。

检查此链接

您必须使用initWithFrame:collectionViewLayout:初始化您的UICollectionView ，您必须传递一个非零的UICollectionViewLayout object 。