How to trigger when UITextField in UITableViewCell resignFromFirstResponder-CodePudding

I have two UITextFields in UITableViewCell, I want to check when the secondTextField resignFromFirstResponder and both firstTextField and secondTextField empty, It will show a warning label. Please take a look at my code below.

import Foundation
import UIKit
import SnapKit
class TwoTextInputTableViewCell: UITableViewCell {
    let firstTextField = UITextField()
    let secondTextField = UITextField()
    let stackView = UIStackView().then {
        $0.axis = .horizontal
        $0.distribution = .fillEqually
        $0.spacing = 15
    }
    let warningLabel = UILabel().then {
        $0.isHidden = true
        $0.addCharacterSpacing(-0.1)
        $0.font = .systemFont(ofSize: 12)
        $0.textColor = UIColor.CommonColor.salmonColor
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String!) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        contentView.addSubviews(stackView, warningLabel)
        stackView.addArrangedSubview(firstTextField)
        stackView.addArrangedSubview(secondTextField)
        stackView.snp.makeConstraints {
            $0.left.equalToSuperview().offset(24)
            $0.right.equalToSuperview().offset(-24)
            $0.top.equalToSuperview().offset(12)
            $0.height.equalTo(56)
        }
        warningLabel.snp.makeConstraints {
            $0.top.equalTo(stackView.snp.bottom).offset(12)
            $0.height.equalTo(16)
            $0.left.right.equalTo(stackView)
        }
        
    }
}

Once it resign, I want to make warningLabel.isHidden = false and reload tableView height, but how to do it? Any answer is appreciated! Thanks

CodePudding user response：

you can easily achive it by using textfield delegate

confirm to delegates first

let firstTextField = UITextField()
let secondTextField = UITextField()
firstTextField.delegate = self
secondTextField.delegate = self

observe for textFieldDidEditing Delegate

extension TwoTextInputTableViewCell : UITextFieldDelegate{
    func textFieldDidEndEditing(textField: UITextField) {
            if textField == firstTextField {
            //first textfield  resignFromFirstResponder
           }else if textField == secondTextField{
           //second textfield  resignFromFirstResponder
            }
        }
    }