UITextField 不会在 Swift 4 的 UITableViewCell 中结束编辑

UITextField doesn't end editing in a UITableViewCell in Swift 4

我还是 swift 的新手,我想请教您。提前谢谢你,抱歉我的英语不好。

我的目标是:

用户点击 table 行中的编辑按钮。 UITextField 出现而不是单元格。输入值并按下 Return 键后,UITextField 再次消失并重新计算单元格。

editButton pressed -> hide priceCell & show UITextField & show keyboard & start editing/entering value (blinking cursor) -> 停止 editing/entering 值按 Return 键执行 -> 隐藏 UITextField & 显示 priceCell & 将输入的值保存到数组中 & 重新加载编辑的行

我使用 答案作为起始蓝图。

我也想使用 .decimalPad 键盘来更容易地输入数值并限制用户只能使用数字(和小数点),但这不包括使用 Return 键作为停止编辑,我我对吗?

我找到了 this 可能的解决方案,但对我来说这对我的问题来说似乎很复杂...

我的ViewController:

import UIKit

class PortfolioViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate, PortfolioCellDelegate {    

    let getData = GetData()

    ...

    override func viewDidLoad() {
        super.viewDidLoad()

        cellTableView.delegate = self
        cellTableView.dataSource = self

        cellTableView.register(UINib(nibName: "PortfolioCell", bundle: nil), forCellReuseIdentifier: "portfolioCell")

        self.currencyControl.selectedSegmentIndex = MyVariables.currencyControlSelected

    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let coinCell = tableView.dequeueReusableCell(withIdentifier: "portfolioCell", for: indexPath) as! PortfolioCell

        ...

        coinCell.delegate = self

        return coinCell
    }

    ...


    func portfolioButtonPressed(coinCell: PortfolioCell) {
        let indexPath = self.cellTableView.indexPathForRow(at: coinCell.center)!
        let selectedCell = cellTableView.cellForRow(at: indexPath) as! PortfolioCell

        selectedCell.priceCell.isHidden = true
        selectedCell.textCell.isHidden = false

        selectedCell.textCell.delegate = self

        func textFieldDidEndEditing(textField: UITextField) {
            let owned: Double = Double(textField.text!)!

            if owned >= 0 {
                MyVariables.dataArray[indexPath.row].ownedCell = owned
            } else {
                MyVariables.dataArray[indexPath.row].ownedCell = 0.00
            }

            selectedCell.priceCell.isHidden = false
            selectedCell.textCell.isHidden = true

            self.cellTableView.reloadData()
        }

        func textFieldShouldReturn(textField: UITextField) -> Bool {
            selectedCell.textCell.resignFirstResponder()
            return true
        }
    }
    ...
}

我的自定义单元格:

import UIKit

protocol PortfolioCellDelegate {
    func portfolioButtonPressed(coinCell: PortfolioCell)
}

class PortfolioCell: UITableViewCell {

    var delegate: PortfolioCellDelegate?

    ...

    @IBAction func editCellPressed(_ sender: UIButton) {
     delegate?.portfolioButtonPressed(coinCell: self)
    }
    ...
}

现在,当正确按下按钮时 UITextField 显示,但在按下 Return 键后不要关闭。

或者我应该完全改变它并使用点击手势吗?

要在任何类型的滚动视图中结束编辑,只需使用这个

cellTableView.keyboardDismissMode = .onDrag

cellTableView.keyboardDismissMode = .interactive

当您与 tableView 交互时,它会隐藏键盘

对于数字小键盘,您可以将工具栏添加为文本字段的 inputAccessoryView。在工具栏上添加取消按钮以关闭键盘。

有两条路可走:

1.) 代表 2.) IQKeyboardManager

1.) 使用 UITextFieldDelegate

有一个特定的回调名为 "textFieldShouldEndEditing" 在这个方法中,return true.

2.) 使用 IQKeyboardManager 一个线性库。这个库自动管理所有的 TextFields 和 scrollviews。您只需在 AppDelegate 中使用一行即可激活它,因此它易于使用。

https://github.com/hackiftekhar/IQKeyboardManager

可以工作,但不如希望的那样圆滑,而且我无法使 IQKeyboardManager 工作,所以我确实使用了 inputAccessoryView

自定义单元格:

import UIKit

protocol PortfolioCellDelegate {
    func portfolioButtonPressed(didSelect coinCell: PortfolioCell)
    func portfolioButtonPressed(coinCell:PortfolioCell, editingChangedInTextCell newValue:String)
}

class PortfolioCell: UITableViewCell, UITextFieldDelegate  {

    var delegate: PortfolioCellDelegate?

    ...

    @IBAction func editCellPressed(_ sender: UIButton) {
        textCell.becomeFirstResponder()
        delegate?.portfolioButtonPressed(didSelect: self)
    }

    @IBAction func textCellValueChanged(_ sender: UITextField) {

        if (sender.text?.isEmpty)! {
            delegate?.portfolioButtonPressed(coinCell: self, editingChangedInTextCell: "XXX")
        } else {
            let text = sender.text
            delegate?.portfolioButtonPressed(coinCell: self, editingChangedInTextCell: text!)
        }
    }

    override func awakeFromNib() {
        super.awakeFromNib()

        self.textCell.delegate = self

        let flexiableSpace = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil)
        let doneButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.done, target: self, action: #selector(self.doneButtonAction))
        let toolBar:UIToolbar = UIToolbar(frame: CGRect(x: 0, y: 0, width: frame.size.width, height: 35))

        toolBar.barTintColor = UIColor(red:0.15, green:0.69, blue:0.75, alpha:1.0)
        toolBar.tintColor = UIColor(red:0.93, green:0.93, blue:0.93, alpha:1.0)
        toolBar.setItems([flexiableSpace, doneButton], animated: false)

        textCell.inputAccessoryView = toolBar
        textCell.keyboardType = UIKeyboardType.decimalPad
    }

    @objc func doneButtonAction() {
        textCell.endEditing(true)
    }

    ...       
}

ViewController:

import UIKit

class PortfolioViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, PortfolioCellDelegate {

    let getData = GetData()

    ...


    override func viewDidLoad() {
        super.viewDidLoad()        

        cellTableView.delegate = self
        cellTableView.dataSource = self

        cellTableView.register(UINib(nibName: "PortfolioCell", bundle: nil), forCellReuseIdentifier: "portfolioCell")

        self.currencyControl.selectedSegmentIndex = MyVariables.currencyControlSelected

        getData.delegate = self

        timeStampLabel.text = MyVariables.timeStamp
    }   

    override func viewDidAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.cellTableView.reloadData()
        self.currencyControl.selectedSegmentIndex = MyVariables.currencyControlSelected
        self.timeStampLabel.text = MyVariables.timeStamp
    }

    //MARK: - tableView
    /***************************************************************/

    ...


    func portfolioButtonPressed(coinCell: PortfolioCell, editingChangedInTextCell newValue: String) {
        let indexPath = self.cellTableView.indexPathForRow(at: coinCell.center)!
        let selectedCell = cellTableView.cellForRow(at: indexPath) as! PortfolioCell

        selectedCell.priceCell.isHidden = false
        selectedCell.textCell.isHidden = true

        if newValue != "XXX" {
            let owned: Double = Double(newValue)!
            MyVariables.dataArray[indexPath.row].ownedCell = owned
        }

        selectedCell.priceCell.isHidden = false
        selectedCell.textCell.isHidden = true

        self.cellTableView.reloadRows(at: [indexPath], with: .automatic)
    }

    func portfolioButtonPressed(didSelect coinCell: PortfolioCell) {
        let indexPath = self.cellTableView.indexPathForRow(at: coinCell.center)!
        let selectedCell = cellTableView.cellForRow(at: indexPath) as! PortfolioCell

        selectedCell.priceCell.isHidden = true
        selectedCell.textCell.isHidden = false
    }
        ...

}

很简单:您应该select那个table查看单元格,然后在属性检查器中启用启用用户交互