问题
So I have thisUITableView cell that has 4 UITextField, and I want to get their values on button click.
This code does not retrieve any values.
@IBAction func printBtnAction(_ sender: Any) {
let cell = self.myTableView.dequeueReusableCell(withIdentifier: "manualAddC1") as! AddFriendC1Cell
let alias = cell.aliasTextField.text!
let primaryPhone = cell.primaryPhoneTextField.text!
let secondaryPhone = cell.seondaryPhoneTextField.text!
let email = cell.emailAddressTextField.text!
print("Alias: \(alias), Phone: \(primaryPhone), Phone2: \(secondaryPhone), Email: \(email)")
}
This is the screenshot of the TableView
回答1:
I finally figured it out with this simple solution.
@IBAction func saveBtnAction(_ sender: Any) {
let index = IndexPath(row: 0, section: 0)
let cell: AddFriendC1Cell = self.myTableView.cellForRow(at: index) as! AddFriendC1Cell
self.alias = cell.aliasTextField.text!
self.primaryPhone = cell.primaryPhoneTextField.text!
self.secondaryPhone = cell.seondaryPhoneTextField.text!
self.email = cell.emailAddressTextField.text!
print("Alias: \(self.alias), Phone: \(self.primaryPhone), Phone2: \(self.secondaryPhone), Email: \(self.email)")
}
回答2:
OK. You are dequeueing a tableViewCell when you press on a button.
let cell = self.myTableView.dequeueReusableCell(withIdentifier: "manualAddC1") as! AddFriendC1Cell
I believe that you want to get a reference to an existing tableViewCell like this:
if let cell = tableView.cellForRow(at: indexPath) as? AddFriendC1Cell {
// do what you need with cell
}
Even though this would work, I wouldn't suggest this approach. What if user is using a smaller-screen phone like iPhone 4 and some cells are not visible on the screen? I think that in that case tableView.cellForRow would return nil for non-visible cell.
I would suggest implementing textField:shouldChange in each cell with text field with a delegate to the tableView's viewController. When text is changed in the cell, delegate should propagate the change to the viewController which would save the value in an instance variable.
Then, when you press on the button, you would simply take values from instance variables.
回答3:
I suppose your tableViewCells are not dynamic. Your cell method will looks like this.
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "YourCellID") as! YourClass
cell.yourTextField.tag = indexPath.row
//
// Alias will be tag 0
// Primary Phone will be tag 1
// Secondary Phone will be tag 2
// Email Address will be tag 3, so on and so forth
// Then, attach to each delegate
//
cell.yourTextField.delegate = self
}
Inside your UITableView handling class (which conforms to UITextFieldDelegate protocol), write this.
func textField(_ textField: UITextField, shouldChangeCharactersIn range:NSRange, replacementString string: String) -> Bool {
let kActualText = (textField.text ?? "") + string
switch textField.tag
{
case 0:
aliasValueHolder = kActualText;
case 1:
primaryPhoneValueHolder = kActualText;
case 2:
secondaryPhoneValueHolder = kActualText;
case 3:
emailAddressValueHolder = kActualText;
default:
print("It is nothing");
}
return true;
}
Then you can submit it.
回答4:
In my opinion, you should implement TextField delegates methods in the tableCell class and manage all the validations and input text in tableCell class.
Now, you will need to fetch all entered values, for this, you have to use Protocol in tableCell class and send entered value using the delegate to viewController also with the tag to identify that which value has entered like the Phone number or email.
Using this way, your code will be reduced and structured.
Happy Coding !!
回答5:
// 1st step
In UITableViewCell
import UIKit
@objc protocol TableViewDelegate: NSObjectProtocol{
func afterClickingReturnInTextField(cell: ThirdTableCell)
}
class TableViewCell: UITableViewCell, UITextFieldDelegate {
@IBOutlet weak var enterTextField: UITextField!
weak var tableViewDelegate: TableViewDelegate?
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
enterTextField.delegate = self
}
// @IBAction Of UITextfiled
@IBAction func tapHerre(_ sender: UITextField) {
tableViewDelegate?.responds(to: #selector(TableViewDelegate.afterClickingReturnInTextField(cell:)))
tableViewDelegate?.afterClickingReturnInTextField(cell: self)
}
// UITextField Defaults delegates
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
enterTextField.resignFirstResponder()
return true
}
func textFieldDidEndEditing(_ textField: UITextField) {
enterTextField = textField
}
}
// 2nd step
In UITableViewCell
extension ViewController: UITableViewDelegate, UITableViewDataSource, TableViewDelegate {
var valueToPass : String?
func afterClickingReturnInTextField(cell: ThirdTableCell) {
valueToPass = cell.enterTextField.text
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return youArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableview.dequeueReusableCell(withIdentifier: "TableViewCell") as! TableViewCell
cell.enterTextField.text = youArray[indexPath.row]
cell.tableViewDelegate = (self as TableViewDelegate)
return cell
}
}
When the keyboard disappears you can find TextField value in valueToPass
回答6:
func textField(_ textField: UITextField, shouldChangeCharactersIn range:NSRange, replacementString string: String) -> Bool {
// let kActualText = (textField.text ?? "") + string
var kActualText = (textField.text! as NSString).replacingCharacters(in: range, with: string)
kActualText = kActualText.trimmingCharacters(in: .whitespaces)
if textField.tag == 0
{
email_address = kActualText;
}
else if textField.tag == 3
{
password = kActualText;
}
else
{
print("It is nothing")
}
return true;
}
来源：https://stackoverflow.com/questions/41219992/how-to-get-values-of-textfields-from-a-uitableviewcell