我实现了一些Swift代码，以在用户滑动屏幕时在tableView中一个接一个地显示单元格标签。
为此，我在words中存储了一个单词列表，而在tableView中只有它的第一项可见。然后，当用户滑动屏幕时，它将使用words中的下一个单词设置下一个单元格的标签。由于words包含一长串单词，因此启用了滚动。
在PlayViewController.swift中，我处理UITableView和手势，而在PlayTableViewCell.swift中，我设置UITableViewCell。在ListViewController.swift中，我问用户他/她想在words数组中存储哪些单词。
PlayViewController.swift
class PlayViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet weak var playTableView: UITableView!
var words = [String]()
var numberOfRevealedLabels = 1
var numberOfGoodAnswers = 0
var numberOfWrongAnswers = 0
var indexGA = 0
var indexWA = 0
override func viewDidLoad() {
super.viewDidLoad()
playTableView.delegate = self
playTableView.dataSource = self
self.playTableView.estimatedRowHeight = 50.0
view.isUserInteractionEnabled = true
let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(self.respondToSwipeGesture))
swipeRight.direction = .right
view.addGestureRecognizer(swipeRight)
let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(self.respondToSwipeGesture))
swipeLeft.direction = .left
view.addGestureRecognizer(swipeLeft)
}
// MARK: Table View Data Source
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return words.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cellIdentifier = "PlayTableViewCell"
guard let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as? PlayTableViewCell else {
fatalError("The dequeued cell is not an instance of PlayTableViewCell.")
}
// Configure the cell...
cell.wordLabel.text = words[indexPath.row]
cell.wordLabel.isHidden = !(indexPath.row <= numberOfRevealedLabels - 1)
return cell
}
@objc func respondToSwipeGesture(gesture: UIGestureRecognizer) {
if let swipeGesture = gesture as? UISwipeGestureRecognizer {
switch swipeGesture.direction {
case UISwipeGestureRecognizer.Direction.right:
indexGA = numberOfRevealedLabels
numberOfRevealedLabels += 1
numberOfGoodAnswers += 1
playTableView.reloadData()
case UISwipeGestureRecognizer.Direction.left:
indexWA = numberOfRevealedLabels
numberOfRevealedLabels += 1
numberOfWrongAnswers += 1
playTableView.reloadData()
default:
break
}
}
}
}
PlayTableViewCell.swift
class PlayTableViewCell: UITableViewCell {
//MARK: Properties
@IBOutlet weak var wordLabel: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
wordLabel.lineBreakMode = .byWordWrapping;
wordLabel.numberOfLines = 0;
wordLabel.isHidden = true
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
}
ListViewController.swift
class ListViewController: UIViewController, UITextFieldDelegate {
@IBOutlet weak var titleTextField: UITextField!
@IBOutlet weak var nametextField: UITextField!
@IBOutlet weak var dataTableView: UITableView!
@IBOutlet weak var saveButton: UIBarButtonItem!
var data = [String]()
//MARK: Properties
var list: List?
//MARK: ViewDidLoad
override func viewDidLoad() {
super.viewDidLoad()
// Handle the text field’s user input through delegate callbacks.
titleTextField.delegate = self
nametextField.delegate = self
// Set up views if editing an existing List.
if let list = list {
navigationItem.title = list.name
titleTextField.text = list.name
data = list.content
}
// Enable the Save button only if the title field has a valid List name
updateSaveButtonState()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func addNameToTable(_ sender: Any) {
guard let word = nametextField.text else {
return
}
data.append(word)
dataTableView.reloadData()
}
@IBAction func playGame(_ sender: Any) {
}
//MARK: UITextFieldDelegate
func textFieldDidBeginEditing(_ textField: UITextField) {
// Disable the Save button while editing
if (textField == titleTextField) {
saveButton.isEnabled = false
} else {
saveButton.isEnabled = true
}
}
func textFieldDidEndEditing(_ textField: UITextField) {
updateSaveButtonState()
navigationItem.title = titleTextField.text
guard let word = nametextField.text else {
return
}
if (textField == nametextField) {
data.append(word)
dataTableView.reloadData()
}
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
// Hide the keyboard.
textField.resignFirstResponder()
return true
}
//MARK: Navigation
@IBAction func cancel(_ sender: UIBarButtonItem) {
// Depending on style of presentation (modal or push presentation), this view controller needs to be dismissed in two different ways.
let isPresentingInAddListMode = presentingViewController is UINavigationController
if isPresentingInAddListMode {
dismiss(animated: true, completion: nil)
} else if let owningNavigationController = navigationController{
owningNavigationController.popViewController(animated: true)
} else {
fatalError("The ListViewController is not inside a navigation controller.")
}
}
// This method lets you configure a view controller before it's presented.
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if (segue.identifier == "playGame") {
// Passing words list to the PlayViewController
let detailVC = segue.destination as! PlayViewController;
detailVC.words = data
}
super.prepare(for: segue, sender: sender)
// Configure the destination view controller only when the save button is pressed.
guard let button = sender as? UIBarButtonItem, button === saveButton else {
os_log("The save button was not pressed, cancelling", log: OSLog.default, type: .debug)
return
}
let name = titleTextField.text ?? ""
list = List(name: name, content: data)
}
//MARK: Private Methods
private func updateSaveButtonState() {
// Disable the Save button if the text field is empty.
let name = titleTextField.text ?? ""
saveButton.isEnabled = !name.isEmpty
}
}
//MARK: Extension
extension ListViewController : UITableViewDelegate, UITableViewDataSource{
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}// Default is 1 if not implemented
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
return data.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{
let cell = tableView.dequeueReusableCell(withIdentifier: "cell")
cell!.textLabel?.text = data[indexPath.row]
return cell!
}
public func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat{
return 50
}
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
let editAction = UITableViewRowAction(style: .default, title: "Edit", handler: { (action, indexPath) in
let alert = UIAlertController(title: "", message: "Edit list item", preferredStyle: .alert)
alert.addTextField(configurationHandler: { (textField) in
textField.text = self.data[indexPath.row]
})
alert.addAction(UIAlertAction(title: "Update", style: .default, handler: { (updateAction) in
self.data[indexPath.row] = alert.textFields!.first!.text!
self.dataTableView.reloadRows(at: [indexPath], with: .fade)
}))
alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
self.present(alert, animated: false)
})
let deleteAction = UITableViewRowAction(style: .default, title: "Delete", handler: { (action, indexPath) in
self.data.remove(at: indexPath.row)
self.dataTableView.reloadData()
})
return [deleteAction, editAction]
}
}
它工作正常。
现在，我想在words中用tableView提示tableView FIFO样式（先进先出） 的每个项目固定数量的行。
假设我有3行func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 3
}
：
words word1
word2
word3
word4
word5
包含5个项目：
First word Second word Third word Fourth word Fifth word
------------ ------------ ------------ ------------ ------------
| word1 | | word1 | | word1 | | word2 | | word3 |
------------ ------------ ------------ ------------ ------------
| | | word2 | | word2 | | word3 | | word4 |
------------ ------------ ------------ ------------ ------------
| | | | | word3 | | word4 | | word5 |
------------ ------------ ------------ ------------ ------------
我想按以下顺序显示它们：
tableView我需要在 PlayViewController.swift 中进行哪些更改才能重新创建此FIFO动画？
我在这里的目标是消除滚动并使其更易于阅读，并且还有助于在通过可滚动的{
"interface": "abc",
"entity": "def",
"attribute": [{
"name": "xyz",
"type": "int"}]
}
执行时似乎无法检测到的滑动。
我不确定是否需要重写代码的大部分或者在 PlayViewController.swift 中更改几行可以解决问题。
感谢您的帮助！