Question

我有一个parentView，其中包含两个不同的CollectionViwes。通过使用Observable将数据传递到BehaviorRelay，从数据库中填充了每个视图。一切正常，直到我必须从collection_view_2更新collection_view_1中的视图。我正在做的是像以前在同一BehaviorRelay中传递的那样传递ParentView获取的数据。但是我看到的是这次是在collection_view_1's单元的点击下，Observable的{{1}}没有被调用。我无法弄清楚为什么这样做。我看到了其他SO问题，但没有人解决此问题。看看下面的代码，以便更好地理解。

Collection_view_1

StudentCell

Collection_view_2

class ClassTabCV: UIViewController, UICollectionViewDelegateFlowLayout {
    let classCells = BehaviorRelay<[ClassModel]>(value: [])
    let pickupVC = PickUpViewController()

    override func viewDidLoad() {
        super.viewDidLoad()
        classTab.rx.setDelegate(self).disposed(by: disposeBag)
        setupBinding()
    }

    func setupBinding() {
        classTab.register(UINib(nibName: "ClassTabCVCell", bundle: nil), forCellWithReuseIdentifier: "classTabCV")
        //Cell creation
        classCells.asObservable().debug("Class View: ").bind(to: classTab.rx.items(cellIdentifier: "classTabCV", cellType: ClassTabCVCell.self)) {[weak self]
            (row , element, cell) in
            cell.viewModel = element
            }.disposed(by: disposeBag)

        // item selection with model details.
        Observable
            .zip(
                classTab
                    .rx
                    .itemSelected,
                classTab
                    .rx
                    .modelSelected(ClassModel.self))
            .bind { [weak self] indexPath, model in
                self?.pickupVC.getStudentsData2(id: model.classId) // here I am trying to pass reference to update Collection_view_2 views.

            }.disposed(by: disposeBag)
    }
}

ParentView_Controller

class StudentCV: UIViewController, UICollectionViewDelegateFlowLayout {


    let studentCells = BehaviorRelay<[StudentModel]>(value: [])
    var dataSource = RxCollectionViewSectionedAnimatedDataSource<SectionViewModel>(configureCell: {( _,_,_,_ ) in
        fatalError()
    })
    private let disposeBag = DisposeBag()

    override func viewDidLoad() {
        super.viewDidLoad()

        studentsView.rx.setDelegate(self).disposed(by: disposeBag)
        setupBinding()
    }

    func setupBinding() {

        dataSource.configureCell = { (ds, cv, ip, item) in

            let cell = cv.dequeueReusableCell(withReuseIdentifier: "studentCV", for: ip) as! StudentCVCell
            cell.viewModel = item
            return cell
        }
            studentCells
                .asObservable()
                .debug("Student View: ")
                .map({ [SectionViewModel(header: "", items: $0.filter({$0.pickupStatus == 2}) ), SectionViewModel(header: "", items: $0.filter({$0.pickupStatus == 3}) )] })
                .bind(to: studentsView.rx.items(dataSource: dataSource))
                .disposed(by: disposeBag)
    }
}

点击let studentCells = BehaviorRelay<[StudentModel]>(value: []) let classCells = BehaviorRelay<[ClassModel]>(value: []) var studentCell : Observable<[StudentModel]> { return studentCells.asObservable().debug("IS DATA IN: ") } // this observable is not calling the time I pass reference from Collection_View_1 on tap. var classCell : Observable<[ClassModel]> { return classCells.asObservable() } override func viewDidLoad() { super.viewDidLoad() getAssignedClassData(classId: id) self.getStudentsData(id: id) bindViewModel() } func getStudentsData(id: Int) { let studentsData = Database.singleton.fetchStudents(byCLassId: id) self!.studentCells.accept(Array(studentsData)) let classData = Database.singleton.fetchClass() self!.classCells.accept(Array(classData)) } func getStudentsData2(id: Int) { let studentsData = Database.singleton.fetchStudents(byCLassId: id) self!.studentCells.accept(Array(studentsData)) // when this calls, observer is not emitting anything. } func bindViewModel() { self .studentCell .asObservable() .debug("BIND: ") .observeOn(MainScheduler.instance) .bind(to: studentsViewController.studentCells) .disposed(by: disposeBag) self .classCell .asObservable() .debug("CELL BIND: ") .observeOn(MainScheduler.instance) .bind(to: classViewController.classCells) .disposed(by: disposeBag) }。 collection_view_1应该更新数据。并相应地更改视图。在我看来，我正在做同样的事情，但不同之处是。 Collection_view_2正在从collectionView获得变更参考，而不是从任何其他CollectionView获得变更参考。任何帮助我解决问题的帮助将不胜感激。谢谢

Observable，即Observing BehaviorRelay仅调用一次。 RxSwift

0 个答案: