ios - 当我使用 Swift 4.2 和 iOS12 向左滑动时如何将第二个数组加载到 UITableView 中？

Question

我刚开始学习 Swift 编程。

当应用程序打开时，我正在将一个数组加载到 UITableView 中。但是，当用户向左滑动时，同一个 UITableView 应该加载第二个数组，而他向右滑动时，UITableView 应该再次加载第一个数组。

我测试了下面的代码，它根据滑动改变颜色。但是，我无法加载第二个数组。

override func viewDidLoad() {
    super.viewDidLoad()

    let rightSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipe(sender:)))
    view.addGestureRecognizer(rightSwipe)
}

@objc func handleSwipe(sender: UISwipeGestureRecognizer) {
    if sender.state == .ended {
        switch sender.direction {
        case .right:
            view.backgroundColor = .red
            print("Right swipe")
            let newCell = goNext(tblView, cellForRowAt: idxPath)
            print(newCell)
}

func goNext(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "chapterCell", for: idxPath)
    if currentChapter != totalChapters[0] {
        cell.textLabel?.numberOfLines = 0
        cell.textLabel?.text = genCh2[indexPath.row]
    }
    return cell
}

Answer 1

两件事:您需要一个 tableView 数据源，并且滑动手势有一个方向并且需要进行设置。

class MyViewController : UIViewController , UITableViewDataSource{

    var tblView : UITableView!
    var genCh1 = ["first","second","later"]
    var genCh2 = ["data","data1","data2"]
    var currentData : [String]?

    //TableViewDataSource
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return currentData?.count ?? 0
    }

    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "chapterCell", for: indexPath)
        //if currentChapter != totalChapters[0] {
        cell.textLabel?.numberOfLines = 0
        cell.textLabel?.text = currentData?[indexPath.row]
          //          }
                    return cell
    }

    func reloadData(_ array : [String]){
         currentData = array
        tblView.reloadData()
    }






    override func viewDidAppear(_ animated: Bool) {

    // setup viewController
        super.viewDidAppear(animated)

        tblView = UITableView.init(frame: view.bounds)
        tblView.backgroundColor = .red
               view.addSubview(tblView)
        tblView.dataSource = self
        tblView.register(UITableViewCell.self, forCellReuseIdentifier: "chapterCell")
        reloadData(genCh1)


        //add gesture

        let rightSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipe(sender:)))
        rightSwipe.direction = .right
        view.addGestureRecognizer(rightSwipe)
        let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipe(sender:)))
        leftSwipe.direction = .left
        view.addGestureRecognizer(leftSwipe)
    }



    @objc func handleSwipe(sender: UISwipeGestureRecognizer) {
        if sender.state == .ended {
            switch sender.direction {
            case .right:
                view.backgroundColor = .red
                print("Right swipe")
               reloadData(genCh1)
            case .left:
                view.backgroundColor = .blue
                print("Left swipe")
             reloadData(genCh2)
            default:
                break;
            }}}
 }