RxSwift，RxDataSources:如何使用RxDataSources将动态数据绑定到UITableView？

Question

通过以下代码将一些数据绑定到UITableView之后：

struct CustomData {
    var anInt: Int
    var aString: String
    var aCGPoint: CGPoint
}

struct SectionOfCustomData {
    var header: String
    var items: [CustomData]
}
extension SectionOfCustomData: SectionModelType {

    init(original: SectionOfCustomData, items: [CustomData]) {
        self = original
        self.items = items
    }
}


class ViewController: UIViewController {

    @IBOutlet weak var tableView: UITableView!

    let disposeBag = DisposeBag()
    var data: RxTableViewSectionedReloadDataSource<SectionOfCustomData>?


override func viewDidLoad() {
        super.viewDidLoad()

        let x = status.asObservable()

        tableView.register(UINib(nibName: "TableViewCell", bundle: nil), forCellReuseIdentifier: "Cell")
        tableView.register(UINib(nibName: "TableViewCellTwo", bundle: nil), forCellReuseIdentifier: "Cell2")


data = RxTableViewSectionedReloadDataSource<SectionOfCustomData>(configureCell: { dataSource, tableView, indexPath, item in

            if indexPath.section > 0 {

                let cell = tableView.dequeueReusableCell(withIdentifier: "Cell2", for: indexPath) as! TableViewCellTwo
                cell.age.text = "\(item.anInt)"
                return cell
            }else {

                let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! TableViewCell
                cell.name.text = item.aString
                cell.age.text = "\(item.anInt)"
                return cell
            }
        })

sections = [
            SectionOfCustomData(header: "First section", items: [CustomData(anInt: 0, aString: "zero", aCGPoint: CGPoint.zero), CustomData(anInt: 1, aString: "one", aCGPoint: CGPoint(x: 1, y: 1)) ]),
            SectionOfCustomData(header: "Second section", items: [CustomData(anInt: 2, aString: "two", aCGPoint: CGPoint(x: 2, y: 2)), CustomData(anInt: 3, aString: "three", aCGPoint: CGPoint(x: 3, y: 3)) ])
        ]

Observable.just(sections)
    .bind(to: tableView.rx.items(dataSource: data!))
    .disposed(by: disposeBag)

在按下按钮并调用函数之后，我在var节中更改数据：

@IBAction func change(_ sender: UIButton) {

sections = [
            SectionOfCustomData(header: "third section", items: [CustomData(anInt: 4, aString: "four", aCGPoint: CGPoint.zero), CustomData(anInt: 5, aString: "five", aCGPoint: CGPoint(x: 1, y: 1)) ]),
            SectionOfCustomData(header: "fourth section", items: [CustomData(anInt: 6, aString: "six", aCGPoint: CGPoint(x: 2, y: 2)), CustomData(anInt: 7, aString: "seven", aCGPoint: CGPoint(x: 3, y: 3)) ])
        ]

但是在调用函数UITableView数据没有改变之后，我的问题是为什么在将节变量绑定到UITableView并在(部分)中更改数据之后，UITableView仍然显示最后的数据？

Answer 1

因为这种变化是无法被观察到的。你需要的是-

// in class body
var dataSubject = PublishSubject<[SectionOfCustomData]>()

// in viewDidLoad() method
dataSubject
  .bind(to: tableView.rx.items(dataSource: data!))
  .disposed(by: disposeBag)

dataSubject.onNext([ /* your initial sections */ ])

// in change() method
dataSubject.onNext([ /* your new sections */ ])