ios - 单元格 UICollectionView 之间的间距不正确

Question

我有一个包含 UICollectionViewCells 的 UICollectionView，其中包含用于内容的 UIButton。

但是每个单元格之间的间距不正确。 Collection View 中的单元格大小并不具体，因为它应该是长度明显不同的标签列表。

它看起来像这样:

每个单元格之间的水平间距完全不正确，因为它们随行而异。

单元格的代码:

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {
    @IBOutlet weak var wordsCollection: UICollectionView!
    var items = ["test", "this", "word view", "like", "collection", "testing", "give", "this", "testing", "test", "test", "this", "word view", "like", "collection", "testing", "give", "this", "testing", "test", "test", "this", "word view", "like", "collection"]
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return self.items.count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "wordCell", for: indexPath as IndexPath) as! WordCell
        cell.wordButton.setTitle(items[indexPath.row], for: UIControlState.normal)
        cell.wordButton.backgroundColor = UIColor.gray
        if(indexPath.row % 3 == 0){
            cell.wordButton.backgroundColor = UIColor.gray
        }
        cell.wordButton.clipsToBounds = true
        cell.wordButton.layer.cornerRadius = 2
        cell.wordButton.sizeToFit()

        return cell
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        if let flowLayout = wordsCollection.collectionViewLayout as? UICollectionViewFlowLayout { flowLayout.estimatedItemSize = CGSize(width:1, height:1) }
        // Do any additional setup after loading the view, typically from a nib.
    }

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


}

语言是 Swift 4，我的目标是 iOS 10.3。

Answer 1

实现:UICollectionViewDelegateFlowLayout

然后:

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
    return THE_SPACING_AMOUNT
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
    return SPACING_BETWEEN_ROWS
}