Swift-集合視圖-集合視圖中間的中心單元格

Question

我試圖居中於UICollectionView內部的所有單元格。 單元格划分為11x4。

我嘗試使用下面的代碼，但是，單元格分組在一行中。

我試圖實現的目標顯示在第二張圖片中：

錯誤

應該

override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {

        let letterCell = collectionView.dequeueReusableCellWithReuseIdentifier("letterCell", forIndexPath: indexPath) as! LetterCellView

        letterCell.center.y = self.view.center.y

        return letterCell

    }

同樣在我的代碼中，我正在使用collectionViewLayout將單元格划分為4行，也許我應該在此處實現居中系統，但是我無法獲得實現該目標的方法。 任何想法？：

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAtIndex section: Int) -> UIEdgeInsets {

        let totalCellWidth = 30 * 11
        let totalSpacingWidth = 2 * (11 - 1)

        let leftInset = (self.view.frame.size.width - CGFloat(totalCellWidth + totalSpacingWidth)) / 2;
        let rightInset = leftInset

        return UIEdgeInsetsMake(0, leftInset, 0, rightInset)
    }

Answer 1

如果您希望使用更直觀的方法，請嘗試更改插圖

Answer 2

找到解決方案：

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAtIndex section: Int) -> UIEdgeInsets {

        let totalCellWidth = 30 * 11
        let totalSpacingWidth = 2 * (11 - 1)

        let leftInset = (self.view.frame.size.width - CGFloat(totalCellWidth + totalSpacingWidth)) / 2;
        let rightInset = leftInset

        let totalCellHeight = 30 * 4
        let totalSpacingHeight = 5 * (4 - 1)

        let topInset = (self.view.frame.size.height - CGFloat(totalCellHeight + totalSpacingHeight)) / 2;
        let bottInset = topInset

        return UIEdgeInsetsMake(topInset, leftInset, bottInset, rightInset)
    }