Question

我有一个TableView，其中加载了自定义单元格。在自定义单元格中有一个文本字段，在填充表格视图时会自动加载一个文本框，以关闭自定义拨号盘。此浮动数字键盘在初始化期间已传递textfield元素。但是只要我按下数字键盘上的按钮，文本字段就不会更改（这仅在表视图单元格中发生）。

所以回顾一下：

UICellView->内部-> UITextField UICellView由其UITableView加载时，将初始化CustomDialPad（UIView）在CustomDialPad初始化到其类的方法的过程中，将传递UITextField

当我按下CustomDialPad中的按钮之一时，UITextField不会自行修改。

所以我在3个不同阶段打印了UITextField元素的转储。

第一阶段结果-单元格加载时转储UITextField：

▿ Optional(<UITextField: 0x7fa83c0cd200; frame = (358 6; 104 30); text = '103.12'; opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x60c000229ae0>>)
  - some: <UITextField: 0x7fa83c0cd200; frame = (358 6; 104 30); text = '103.12'; opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x60c000229ae0>> #0
    - super: UIControl
      - super: UIView
        - super: UIResponder
          - super: NSObject

第2阶段结果-加载CustomDialPad时转储UITextField：

- <UITextField: 0x7fa83c0cd200; frame = (358 6; 104 30); text = '103.12'; opaque = NO; autoresize = RM+BM; gestureRecognizers = <NSArray: 0x60c00005d190>; layer = <CALayer: 0x60c000229ae0>> #0
  - super: UIControl
    - super: UIView
      - super: UIResponder
        - super: NSObject
▿ Optional(<UITextField: 0x7fa83c096a00; frame = (358 6; 104 30); text = '103.12'; opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x60c00022b8a0>>)
  - some: <UITextField: 0x7fa83c096a00; frame = (358 6; 104 30); text = '103.12'; opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x60c00022b8a0>> #0
    - super: UIControl
      - super: UIView
        - super: UIResponder
          - super: NSObject

第3阶段结果-按下CUstomDialPad的按钮时转储UITextField

▿ Optional(<UITextField: 0x7fa83c0cd200; frame = (358 6; 104 30); text = '103.12'; opaque = NO; autoresize = RM+BM; gestureRecognizers = <NSArray: 0x60c00005d190>; layer = <CALayer: 0x60c000229ae0>>)
  - some: <UITextField: 0x7fa83c0cd200; frame = (358 6; 104 30); text = '103.12'; opaque = NO; autoresize = RM+BM; gestureRecognizers = <NSArray: 0x60c00005d190>; layer = <CALayer: 0x60c000229ae0>> #0
    - super: UIControl
      - super: UIView
        - super: UIResponder
          - super: NSObject

您可以看到这里是3个不同阶段的参考：

Phase 1: Optional(UITextField: 0x7fa83c0cd200)
Phase 2: UITextField: 0x7fa83c0cd200
         Optional(UITextField: 0x7fa83c096a00)
Phase 3: Optional(UITextField: 0x7fa83c0cd200)

为什么在第2阶段有2个不同的引用？难道是在CustomDialPad按下按钮期间UITextFields中的值不改变的原因吗？在第2阶段的其他阶段中如何检索具有相同引用的元素？

关于， Matteo

帮助代码：

自定义UIView类NumbersPadView

class NumbersPadView: UIView {
    @IBOutlet weak var number1: UIButton!
    @IBOutlet weak var number2: UIButton!
    @IBOutlet weak var number3: UIButton!
    @IBOutlet weak var number4: UIButton!
    @IBOutlet weak var number5: UIButton!
    @IBOutlet weak var number6: UIButton!
    @IBOutlet weak var number7: UIButton!
    @IBOutlet weak var number8: UIButton!
    @IBOutlet weak var number9: UIButton!
    @IBOutlet weak var zero: UIButton!
    @IBOutlet weak var dot: UIButton!
    @IBOutlet weak var delete: UIButton!
    @IBOutlet weak var done: UIButton!

    var connectedTextField: UITextField!
    var isFirstInput = true

    override func draw(_ rect: CGRect) {
        // Drawing code
    }

    func showMyself(showing: UIView, element: UITextField) {
        self.connectedTextField = element
        self.connectedTextField.resignFirstResponder()
        self.isFirstInput = true
        self.connectedTextField.selectedTextRange = self.connectedTextField.textRange(from: self.connectedTextField.beginningOfDocument, to: self.connectedTextField.endOfDocument)
        self.alpha = 0.0
        let frame = showing.convert(self.connectedTextField.frame, from:self.connectedTextField.superview)
        self.frame.origin.x = CGFloat(Double(frame.origin.x) - Double(self.frame.width) - 2)
        self.frame.origin.y = CGFloat((Double(frame.origin.y) + Double(element.frame.height) / 2) - Double(self.frame.height) / 2)

        if self.superview == nil {
            showing.addSubview(self)
        }

        UIView.animate(withDuration: 0.4, animations: {
            self.alpha = 1.0
        })
        dump(self.connectedTextField) //Phase 2
    }

    @IBAction func buttonPressed(_ sender: UIButton) {
        if (isFirstInput) {
            self.connectedTextField.text = ""
        }
        self.isFirstInput = false
        switch sender.tag {
        case 10: //zero
            self.connectedTextField.text = self.connectedTextField.text! + "0"
            break
        case 12: //back
            if self.connectedTextField.text != "" {
                var tmpText = self.connectedTextField.text
                tmpText = tmpText?.substr(start: 1, length: (tmpText?.length)! - 1)
                self.connectedTextField.text = tmpText
                if tmpText == "." {
                    tmpText = tmpText?.substr(start: 1, length: (tmpText?.length)! - 1)
                    self.connectedTextField.text = tmpText
                }
            }
            break
        case 13:
            if self.connectedTextField.text != "" && self.connectedTextField.text?.range(of:".") == nil {
                self.connectedTextField.text = self.connectedTextField.text! + "."
            }
            break
        default:
            self.connectedTextField.text = self.connectedTextField.text! + String(sender.tag)
            break
        }
        self.connectedTextField.selectedTextRange = self.connectedTextField.textRange(from: self.connectedTextField.endOfDocument, to: self.connectedTextField.endOfDocument)
        dump(self.connectedTextField) //Phase 3
    }

    @IBAction func donePressed(_ sender: UIButton) {
        let tmpDoubleValue = self.connectedTextField.text?.getDouble()
        self.connectedTextField.text = tmpDoubleValue?.toString(2)
        self.connectedTextField.selectedTextRange = self.connectedTextField.textRange(from: self.connectedTextField.endOfDocument, to: self.connectedTextField.endOfDocument)
        UIView.animate(withDuration: 0.3, animations: {
            self.alpha = 0.0
        })
        self.connectedTextField.resignFirstResponder()
    }

填充UITableViewCell

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
            let tmpCell = Bundle.main.loadNibNamed("ItemCellNew", owner: self, options: nil)?.first as! ItemCellNew
            tmpCell.setCell(item: items[indexPath.row])
            tmpCell.POSItemsFunctionsDelegate = self
            if self.idOrder != "" {
                tmpCell.setOrderCell()
            }
            dump(tmpCell.amountInput) // Phase 1
            return tmpCell
        }

Cell方法setCell（）

func setCell(item: itemStruct) {
        if item.realQty < item.qty {
            self.bkgView?.backgroundColor = UIColor(named: "NO_QUANTITY")
        }
        self.title.text = item.title
        self.brand.text = item.brand
        self.qty.text = String(item.qty)
        self.amountInput.text = String(item.prc)
        self.subTotal.text = String(item.prc * Double(item.qty))
        self.amountInput.setShowingNumberPad()
    }

UITextField的扩展名：

func setShowingNumberPad() {
        self.addTarget(self, action: #selector(didEditingBegin(_:)), for: .editingDidBegin)
    }

    @objc func didEditingBegin(_ sender:UITextField) {
        var customKeyboard: NumbersPadView!
        let views = sender.parentViewController?.view.subviews.filter{$0 is NumbersPadView}
        if views?.count == 0 {
            customKeyboard = (Bundle.main.loadNibNamed("NumbersPadView", owner: self, options: nil)?.first as? NumbersPadView)!
        } else {
            customKeyboard = views?.first as! NumbersPadView
        }
        customKeyboard.showMyself(showing: (self.parentViewController?.view)!, element: sender as UITextField)
    }

Answer 1

我找到了解决此问题的方法，方法是修改包含在与选定单元格的indexPath相对应的items数组中的项目，然后将数据重新加载到tableview内部。

您无法直接访问位于单元格内部的输入字段。

TableViewCell中的元素具有多个引用

1 个答案: