在swift中定制uicollectionview的布局？

Question

我在UICollectionView的一个部分中有7个单元格。 我搜索了几个小时，但我能找到的是有关数百个单元格的CollectionFlow和Custom布局的信息。我想要的是使用如下图像的布局在集合视图中显示具有不同标识符的7个单元格：

如何实现此布局？

Answer 1

一步一步地按照此URL ....

SWIFT：

http://www.raywenderlich.com/78550/beginning-ios-collection-views-swift-part-1

目标C：

https://github.com/eoghain/RBCollectionViewBalancedColumnLayout

Answer 2

这是我的解决方案。

class HistoryLayout: UICollectionViewLayout {

    var delegate : HistoryLayoutDelegate?

    var yOffSet : CGFloat = 0
    var xOffSetLand : CGFloat = 0
    var xOffSetPort : CGFloat = 0

    var portraitElements : [Int] = []

    var portraintItemPositionIndex = PortraintItemPositionIndex.Left

    private var cache = [CGRect]()

    var contentHeight: CGFloat  = 0.0
    var contentWidth: CGFloat {
        let insets = collectionView!.contentInset
        return CGRectGetWidth(collectionView!.bounds) - (insets.left + insets.right)
    }

    override func collectionViewContentSize() -> CGSize {
        return CGSize(width: contentWidth, height: contentHeight)
    }

    override func layoutAttributesForElementsInRect(rect: CGRect) -> [UICollectionViewLayoutAttributes]? {

        var layoutAttributes = [UICollectionViewLayoutAttributes]()

        for item in 0 ..< collectionView!.numberOfItemsInSection(0) {
            let indexPath = NSIndexPath(forItem: item, inSection: 0)

            let attributes = UICollectionViewLayoutAttributes(forCellWithIndexPath: indexPath)
            attributes.frame = cache[item]
            if CGRectIntersectsRect(attributes.frame, rect) {
                layoutAttributes.append(attributes)
            }
        }

        //send index list of elements with portraint position
        if let _ = delegate {
            delegate?.elementsWithVerticalPosition(self.portraitElements)
        }

        return layoutAttributes
    }

    override func prepareLayout() {

        if cache.isEmpty {
            var gropCount = Int(collectionView!.numberOfItemsInSection(0) / 3)

            if collectionView!.numberOfItemsInSection(0) % 3 != 0 {
                gropCount++
            }

            for index in 1...gropCount {

                self.improGroupByItem(index)

                contentHeight = ((contentWidth / 3) * 2) * CGFloat(index)
            }
        }
    }


    private func improGroupByItem(index : Int){
        if index % 2 == 0 {
            xOffSetLand = contentWidth / 3
            xOffSetPort = 0
            self.portraintItemPositionIndex = .Right
        }else{
            xOffSetLand = 0
            xOffSetPort = (contentWidth / 3) * 2
            self.portraintItemPositionIndex = .Left
        }

        if index > 1 {
          self.yOffSet += (contentWidth / 3) * 2
        }

        addItemToStack(index)
    }

    func addItemToStack(gIndex : Int){
        let columnWidth = self.contentWidth / 3
        var frame : CGRect

        var dublicate = 0

        for index in 1...3 {
            if index % portraintItemPositionIndex.rawValue == 0 {
                let width = columnWidth * 1
                let height = columnWidth * 2
                frame = CGRect(x: self.xOffSetPort, y: yOffSet, width: width, height: height)

                let indexOfPortElement = ((gIndex - 1)*3) + index - 1
                portraitElements.append(indexOfPortElement)
            }else{
                let width = columnWidth * 2
                let height = columnWidth * 1
                frame = CGRect(x: self.xOffSetLand, y: yOffSet + (height * CGFloat(dublicate)), width: width, height: height)
                dublicate++
            }

            cache.append(frame)
        }
    }
}

Answer 3

我认为有两种解决方案：

• 使用图书馆：https://github.com/bryceredd/RFQuiltLayout

• 使用FlowLayout：https://developer.apple.com/library/ios/documentation/WindowsViews/Conceptual/CollectionViewPGforIOS/UsingtheFlowLayout/UsingtheFlowLayout.html

我认为你有你所需要的一切！ ;）

Answer 4

可以使用FlowLayout，但您必须自定义FlowLayout属性。

对于不同的单元格大小，请使用此方法 -

-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath;