ios - 无法从委托(delegate)快速获取值

Question

我是 ios 开发和 swift 的新手。我遇到了一个问题。请帮我解决这个问题。我正在使用一个自定义日期选择器，因为我使用两个标签，标签名称是 fromDateLbl 和 toDateLbl。我使用两个按钮 fromDateBtn 和 toDateBtn。如果我使用一个标签和一个按钮，我能够获取日期，但无法获取两个按钮的日期。

请参阅我的代码。

    import UIKit

    class SecondViewController: UIViewController {

        @IBOutlet var fromDateLabel: UILabel!
        @IBOutlet var toDateLabel: UILabel!

        override func viewDidLoad() {
            super.viewDidLoad()

        }
        @IBAction func fromDateAction(_ sender: Any) {

            let popOverVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "CustomDatePickerViewController") as! CustomDatePickerViewController
            self.addChildViewController(popOverVC)
            self.view.addSubview(popOverVC.view)
            popOverVC.view.frame = view.bounds
            popOverVC.delegate = self as? CustomDatePickerDelegate
            popOverVC.didMove(toParentViewController: self)

            self.navigationController?.navigationBar.isHidden = true
        }        
    }
    @IBAction func toDateAction(_ sender: Any) {

            let popOverVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "CustomDatePickerViewController") as! CustomDatePickerViewController
            self.addChildViewController(popOverVC)
            self.view.addSubview(popOverVC.view)
            popOverVC.view.frame = view.bounds
            popOverVC.delegate = self as? CustomDatePickerDelegate
            popOverVC.didMove(toParentViewController: self)

            self.navigationController?.navigationBar.isHidden = true
        }


    }


    extension SecondViewController:CustomDatePickerDelegate
    {
        func CustomDateSeletced(value: String) {
            fromDateLabel.text = value

        }

    }

第二个Vc代码。

class CustomDatePickerViewController: UIViewController {


    @IBOutlet var myDatePicker: UIDatePicker!

    var delegate: CustomDatePickerDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()

        view.frame.size.height =  UIScreen.main.bounds.height
        self.view.backgroundColor = UIColor.black.withAlphaComponent(0.6)
    }


    @IBAction func saveDateAction(_ sender: Any) {

        myDatePicker.datePickerMode = UIDatePickerMode.date
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "dd MMM yyyy"
        let saveDate = dateFormatter.string(from: myDatePicker.date)
        print("selectedDate",saveDate)
        delegate?.CustomDateSeletced(value: saveDate)
        self.removeAnimate()
        self.navigationController?.navigationBar.isHidden = false

    }

这是我的委托(delegate)类。

import Foundation

protocol  CustomDatePickerDelegate {
        func CustomDateSeletced(value: String)
}

Answer 1

这不是完美的解决方案，但下面的代码可能会对您有所帮助。为了改进一点，您可以使用 UILabel 操作并删除 UIButtons 并存储编辑的标签，这样您也可以防止 UILabel 编辑。

Phillip Mills为您实现更好的解决方案。

class SecondViewController: UIViewController {

    @IBOutlet var fromDateLabel: UILabel!
    @IBOutlet var toDateLabel: UILabel!

    @IBOutlet var fromDateButton: UIButton!
    @IBOutlet var toDateButton: UIButton!

    var selectedButton: UIButton?

    override func viewDidLoad() {
        super.viewDidLoad()

    }
    @IBAction func selectDateAction(_ sender: Any) {
        selectedButton = sender as? UIButton

        let popOverVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "CustomDatePickerViewController") as! CustomDatePickerViewController
        self.addChildViewController(popOverVC)
        popOverVC.delegate = self as? CustomDatePickerDelegate
        present(popOverVC, animated: true, completion: nil)

        self.navigationController?.navigationBar.isHidden = true
    }


}

extension SecondViewController:CustomDatePickerDelegate
{
    func CustomDateSeletced(value: String) {
        if let button = selectedButton {
            if button == toDateButton {
                toDateLabel.text = value
            } else {
                fromDateLabel.text = value
            }
            selectedButton = nil
        }

    }

}

-

@IBAction func saveDateAction(_ sender: Any) {

    myDatePicker.datePickerMode = UIDatePickerMode.date
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "dd MMM yyyy"
    let saveDate = dateFormatter.string(from: myDatePicker.date)
    delegate?.CustomDateSeletced(value: saveDate)
    self.navigationController?.navigationBar.isHidden = false
    dismiss(animated: true, completion: nil)
}