ios - 1 个 UIviewcontroller 中的 2 个 UIcollectionview 具有 2 个不同的 UIcollectionflowlayout？

Question

我知道有没有办法在 1 个 UIviewcontroller 中实现 2 个 UIcollectionview 和 2 个不同的 UIcollectionflow 布局。主要问题是一个 UIcollectionview 符合 iOS UIcollectionviewflowlayout ，另一个符合 Waterfalllayout 。因为我现在面临的问题是我不能在一个 UIviewcontroller 中同时拥有这两个委托(delegate)函数。谢谢大家。

 func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {

        }


func collectionView(_ collectionView: UICollectionView, layout: WaterfallLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {

    }

Answer 1

     //: Playground - noun: a place where people can play

import UIKit

class Controller: UIViewController, UICollectionViewDelegateFlowLayout, WaterfallLayoutDelegate {

    let collectionView = UICollectionView(frame: CGRect.zero)
    let waterfallCollectionView = UICollectionView(frame: CGRect.zero)

    override func viewDidLoad() {

        collectionView.delegate = self
        collectionView.collectionViewLayout = UICollectionViewFlowLayout()

        waterfallCollectionView.delegate = self
        let waterfallLayout = WaterfallLayout()
        waterfallLayout.delegate = self
        waterfallCollectionView.collectionViewLayout = waterfallLayout
    }

    //MARK: - WaterfallLayoutDelegate

    func collectionView(_ collectionView: UICollectionView, layout: WaterfallLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {

        return CGSize.zero
    }

    //MARK: - UICollectionViewDelegateFlowLayout

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {

        return CGSize.zero
    }
}

//MARK: - Just for test

protocol WaterfallLayoutDelegate: class {

    func collectionView(_ collectionView: UICollectionView, layout: WaterfallLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
}

class WaterfallLayout: UICollectionViewLayout {

    weak var delegate: WaterfallLayoutDelegate?
}

一切正常。