私はIGListKitを模索していると私はIGListSectionControllerサブクラスでこれを達成しようとしているカスタムIGListSectionController

Question

にする方法：

基本的には、各色の面積が1 UICollectionViewCellです。私はすでに緑色の領域がないものを作った。しかし、私が望むのは、上記の例のレイアウトです。これはどうすればいいですか？

Answer 1

私は答えを見つけましたが、実際はかなりシンプルでした。だから（UICollectionViewのように）、カスタムUICollectionViewLayoutで設定する必要があります。

let collectionView:IGListCollectionView = { 
    let layout = MyCustomLayout() 
    let view = IGListCollectionView(frame: .zero, collectionViewLayout: layout) 
    return view 
}() 

はここに私のカスタムレイアウトは次のようになります：共有のため

が

protocol MyCustomLayoutDelegate { 
    func heightForItem(inCollectionView: UICollectionView, at position: Int) -> CGFloat 
} 

class MyCustomLayout: UICollectionViewLayout, MyCustomLayoutDelegate { 

    var delegate:MyCustomLayoutDelegate? 

    private var cache = [UICollectionViewLayoutAttributes]() 

    private var aHeight:CGFloat = 0 

    private var contentWidth:CGFloat { 
     return collectionView!.bounds.width 
    } 

    override func prepare() { 

     if cache.isEmpty { 

      var yOffset:CGFloat = 0 

      for section in 0 ..< collectionView!.numberOfSections { 
       let contentHeight = (delegate ?? self).heightForItem(inCollectionView: collectionView!, at: section) 
       let leftAreaWidth = contentHeight - 1 
       let topAreaHeight:CGFloat = 20.0 
       let bottomAreaHeight = contentHeight - topAreaHeight - 1 
       let bottomAreaWidth = contentWidth - leftAreaWidth 

       let leftAreaIndexPath = IndexPath(item: 0, section: section) 
       let topAreaIndexPath = IndexPath(item: 1, section: section) 
       let bottomAreaIndexPath = IndexPath(item: 2, section: section) 

       let leftAreaFrame = CGRect(x: 0, y: yOffset, width: leftAreaWidth, height: leftAreaWidth) 
       let topAreaFrame = CGRect(x: leftAreaWidth, y: yOffset, width: bottomAreaWidth, height: topAreaHeight) 
       let bottomAreaFrame = CGRect(x: leftAreaWidth, y: yOffset + topAreaHeight, width: bottomAreaWidth, height: bottomAreaHeight) 

       let leftAreaAttributes = UICollectionViewLayoutAttributes(forCellWith: leftAreaIndexPath) 
      leftAreaAttributes.frame = leftAreaFrame 
      cache.append(leftAreaAttributes) 

       let topAreaAttributes = UICollectionViewLayoutAttributes(forCellWith: topAreaIndexPath) 
      topAreaAttributes.frame = topAreaFrame 
      cache.append(topAreaAttributes) 

       let bottomAreaAttributes = UICollectionViewLayoutAttributes(forCellWith: bottomAreaIndexPath) 
      bottomAreaAttributes.frame = bottomAreaFrame 
      cache.append(bottomAreaAttributes) 

       yOffset += contentHeight 
      } 

      aHeight = yOffset 
     } 
    } 

    override var collectionViewContentSize: CGSize { 
     return CGSize(width: contentWidth, height: aHeight) 
    } 

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

     return cache.filter { 
      $0.frame.intersects(rect) 
     } 
    } 

    override func layoutAttributesForItem(at indexPath: IndexPath) -> UICollectionViewLayoutAttributes? { 

     return cache.first { 
      $0.indexPath == indexPath 
     } 

    } 

    override func shouldInvalidateLayout(forBoundsChange newBounds: CGRect) -> Bool { 

     if let oldWidth = collectionView?.bounds.width { 
      return oldWidth != newBounds.width 
     } 

     return false 
    } 

    override func invalidateLayout() { 
     super.invalidateLayout() 

     cache = [] 
     aHeight = 0 
    } 

    //Delegate 
    internal func heightForItem(inCollectionView: UICollectionView, at postion: Int) -> CGFloat { 
     return 0 
    } 
}