Question

我尝试创建一个collectionView并使用RxSwift将数据填充到其中。然而，即使它似乎返回datasource.configureCell中的对象，它也不会显示任何单元格。我怀疑viewDidLoad中的设置存在问题？

设置collectionView

    // Create a waterfall layout
    let layout = CHTCollectionViewWaterfallLayout()

    //Add CollectionView
    self.collectionView = UICollectionView(frame: CGRect(x: 0, y: 0, width: self.view.frame.width, height: self.view.frame.height), collectionViewLayout: layout)

    self.view.addSubview(collectionView)

    //Customize
    self.collectionView!.alwaysBounceVertical = true

    // Collection view attributes
    self.collectionView.autoresizingMask = [UIViewAutoresizing.flexibleHeight, UIViewAutoresizing.flexibleWidth]
    self.collectionView.alwaysBounceVertical = true

    //Register cell
    collectionView.register(PetsaleCell.self, forCellWithReuseIdentifier: reuseIdentifier)


    //Constraints
    self.collectionView.snp.makeConstraints({ make in
        make.bottom.equalTo(0)
        make.left.equalTo(0)
        make.right.equalTo(0)
        make.top.equalTo(0)

    })

    //Datasource
    setUpDataSource()

setUpDataSource

func setUpDataSource() {
    dataSource.configureCell = { (_, tv, ip, animal: Animal) in

        let cell = tv.dequeueReusableCell(withReuseIdentifier: self.reuseIdentifier, for: ip) as! PetsaleCell
        cell.petCellViewModel = PetCellViewModel(animal: animal)

        return cell
    }



    let loadNextPageTrigger = self.collectionView.rx.contentOffset
        .flatMap { _ in
            self.collectionView
                .isNearBottomEdge(edgeOffset: 20.0)
                ? Observable.just(())
                : Observable.empty()
    }

    animalViewModel.rx_animals(loadNextPageTrigger)
        .asDriver(onErrorJustReturn: .empty).map { [SectionModel(model: "Animal", items: $0.animals)] }
        .drive(collectionView.rx.items(dataSource: dataSource))
        .addDisposableTo(disposeBag)
}


func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: IndexPath) -> CGSize {
    return CGSize(width: 200, height: 200)
}

Answer 1

您需要在dataSources绑定之后设置您的委托。

collectionView
    .rx.delegate
    .setForwardToDelegate(self, retainDelegate: false)

Answer 2

尝试在viewDidLoad（）

中添加以下内容

collectionView.delegate = self
collectionView.dataSource = self

然后将delegate和datasouce实现为类的扩展，如下所示：

extension MyClass: UICollectionViewDelegate, UICollectionViewDataSource     { 
// add extension methods here such as cellForItemAt 
}

collectionView与RxSwift没有显示任何项目

2 个答案: