Wrapping ASTableNode/ASCollectionNode/ASPagerNode etc

PagerExample.swift

import Foundation
import AsyncDisplayKit

class TestController: ASViewController<ASDisplayNode>, ASPagerDelegate, ASPagerDataSource {
    
    lazy var topNode: ASDisplayNode = {
        let node = ASDisplayNode()
        node.backgroundColor = .red
        node.style.height = .init(unit: .points, value: 40.0)
        return node
    }()
    
    lazy var pagerNode: ASPagerNode = {
        let node = ASPagerNode()
        node.backgroundColor = .blue
        return node
    }()
    
    init() {
        super.init(node: .init())
        self.node.backgroundColor = .white
        self.node.automaticallyRelayoutOnSafeAreaChanges = true
        self.node.automaticallyManagesSubnodes = true
        pagerNode.setDataSource(self)
        pagerNode.setDelegate(self)
        self.node.layoutSpecBlock = { [unowned self] (_ , sizeRange) -> ASLayoutSpec in
            return self.layoutSpec(sizeRange)
        }
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    func layoutSpec(_ constrainedSize: ASSizeRange) -> ASLayoutSpec {
        
        // NOTE: Wrapping ASPagerNode
        let pagerLayout = ASWrapperLayoutSpec.init(layoutElement: pagerNode)
        pagerLayout.style.flexGrow = 1.0
        pagerLayout.style.flexShrink = 1.0
        
        let stack = ASStackLayoutSpec.init(direction: .vertical,
                                           spacing: 0.0,
                                           justifyContent: .start,
                                           alignItems: .stretch,
                                           children: [topNode, pagerLayout])
        
        return ASInsetLayoutSpec.init(insets: self.node.safeAreaInsets, child: stack)
    }
    
    func pagerNode(_ pagerNode: ASPagerNode, nodeAt index: Int) -> ASCellNode {
        let cellNode = ASCellNode()
        cellNode.backgroundColor = UIColor.init(white: 0.5, alpha: 0.2)
        return cellNode
    }
    
    func numberOfPages(in pagerNode: ASPagerNode) -> Int {
        return 10
    }
}