Swift 3.0 中的 UICollectionViewController 错误:必须使用非零布局参数进行初始化

问题描述

我是 iOS 开发新手.我一直在学习 Swift，今天我尝试使用 UICollectionViewController.

I'm new to iOS development.I've been learning Swift, and today, I tried using UICollectionViewController.

我的代码如下:

 class ViewController: UICollectionViewController, UICollectionViewDelegateFlowLayout {
    var colView: UICollectionView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
        layout.sectionInset = UIEdgeInsets(top: 20, left: 10, bottom: 10, right: 10)
        layout.itemSize = CGSize(width: 90, height: 120)

        colView = UICollectionView(frame: self.view.frame, collectionViewLayout: layout)
        colView.dataSource = self
        colView.delegate = self
        colView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "Cell")
        colView.backgroundColor = UIColor.white
        self.view.addSubview(colView)
    }

    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 14
    }

    func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath as IndexPath)
        cell.backgroundColor = UIColor.orange
        return cell
    }


}

但是，当我尝试运行它时，我收到以下错误:

However, when I try to run it, I get the following error:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'UICollectionView must be initialized with a non-nil layout parameter'

我查看了以前讨论此问题的帖子，但找不到任何可以修复我的代码的内容.

I have looked up previous posts discussing this issue, but I couldn't find anything that fixed my code.

我应该如何解决这个问题?

How should I fix this?

推荐答案

谢谢！我采纳了你的建议.以下是有效的代码:

Thank you! I incorporated your suggestions. Below is the code that works:

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
    let cellId = "CellId"
    var colView: UICollectionView!

    override func viewDidLoad() {
        super.viewDidLoad()

        let layout = UICollectionViewFlowLayout()
        layout.sectionInset = UIEdgeInsets(top: 20, left: 10, bottom: 10, right: 10)
        layout.itemSize = CGSize(width: 111, height: 111)

        colView = UICollectionView(frame: self.view.frame, collectionViewLayout: layout)
        colView.delegate   = self
        colView.dataSource = self
        colView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "Cell")
        colView.backgroundColor = UIColor.white

        self.view.addSubview(colView)
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 21
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath as IndexPath)
        cell.backgroundColor = UIColor.orange
        return cell
    }
}

再次，非常感谢你们.祝你有美好的一天:D

Again, thank you guys very much. Have an awesome day :D

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