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HTML5 发布时间：2022-04-27 发布网站：大佬教程 code.js-code.com

大佬教程收集整理的这篇文章主要介绍了UIDatePicker,默认值为nil – iOS，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

我搜索了很多但没找到解决办法.任何人都可以帮助我找出如何将uIDatePicker初始值设置为空文本字段？

import UIKit
    import Alamofire
    import KVNProgress

    class EditProfileVC: UIViewController,UIImagePickerControllerDelegate,UINavigationControllerDelegate
    {
        @IBOutlet var datePickerView: UIView!
        @IBOutlet var datePicker: UIDatePicker!


        @IBOutlet var birthdayText: UnderLineTextField!
        @IBOutlet var bioText: UnderLineTextField!

        @IBOutlet var scrollView: UIScrollView!
        var imagePicker = UIImagePickerController()

        var photoFlag = -1

        let activityView = UIActivityInDicatorView(activityInDicatorStyle: .whiteLargE)

        var singleTonInstance = SingleTon.sharedDataContainer

        var email = ""
        var token = ""

        override func viewDidLoad()
        {
            super.viewDidLoad()

            self.birthdayText.text = ""
            if #available(iOS 11.0,*)
            {
                navigationController?.navigationBar.prefersLargetitles = false
            }
            else
            {
                // fallBACk on earlier versions
            }

            SwiftyPlistManager.shared.getValue(for: "access_token",fromPlistWithName: "AccountDetails") { (result,err) in

                if err == nil
                {
                    self.token = (result as? String)!
                }
            }

            activityView.color = UIColor.blue
            activityView.center = self.view.center

            self.view.addSubview(activityView)

            self.datePickerView.isHidden  = true

            self.genderTxt.isUserInteractionEnabled = false
            self.birthdayText.isUserInteractionEnabled = false

            imagePicker.delegate = self

            datePicker.addTarget(self,action: #SELEctor(datePickerChanged),for: .valueChanged)

self.getProfileDetails()


        }

        @objc func savePressed()
        {
            self.activityView.isHidden = false
            self.activityView.startAnimaTing()

            let dateFormatter = DateFormatter()
            dateFormatter.dateFormat = "MMMM dd,YYYY"
            let date = dateFormatter.date(from: self.birthdayText.text!)
            dateFormatter.dateFormat = "dd-MM-yyyy"
            let dob = dateFormatter.String(from: date!)

            let appDelegate = UIApplication.shared.delegate as! AppDelegate

            let urlString = appDelegate.serverUrl + "edit_profile?full_name=\(self.fullNameText.text!)@R_673_7231@ob=\(dob)&gender=\(self.genderTxt.text!)&bio_data=\(self.bioText.text!)&LOCATIOn=\(self.LOCATIOntext.text!)&web_site=\(self.webTextField.text!)&token=\(self.token)"


        }


        @objc func datePickerChanged(sender: UIDatePicker)
        {
            let formatter = DateFormatter()
            formatter.dateFormat = "MMMM dd,YYYY"
            birthdayText.text = formatter.String(from: sender.datE)
        }
        override func didReceiveMemoryWarning()
        {
            super.didReceiveMemoryWarning()
        }
        func getProfileDetails()
        {
            self.activityView.isHidden = false
            self.activityView.startAnimaTing()

            let appDelegate = UIApplication.shared.delegate as! AppDelegate

            let urlString = appDelegate.serverUrl + "view_profile?token=\(self.token)"

                }
            }
        }

        @IBACtion func birthdayTapped(_ sender: Any)
        {
            self.datePickerView.isHidden = false
        }
    }

上面的代码是我的整个viewcontroller类代码,任何人都可以请你帮我找出解决方案.我将birthdayText的值赋值为nil I ViewController但没有用.

解决方法

默认情况下,UITextField的text属性为空.所以下面的代码按预期工作.将它与您的代码进行比较：

class ViewController: UIViewController {

    private let textField: UITextField = {
        let tf = UITextField()
        tf.borderstyle = .roundedRect
        tf.placeholder = "Choose date and time"
        tf.text = "" // not even necessary
        return tf
    }()

    lazy private var datePicker: UIDatePicker = {
        let dp = UIDatePicker()
        dp.addTarget(self,action: #SELEctor(datePickerValueChanged),for: .valueChanged)
        return dp
    }()

    lazy private var dateFormatter: DateFormatter = {
        let df = DateFormatter()
        df.dateStyle = .short
        df.timestyle = .short
        return df
    }()

    @objc private func datePickerValueChanged(datePicker: UIDatePicker) {
        textField.text = dateFormatter.String(from: datePicker.datE)
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        let stackView = UIStackView(arrangedSubviews: [textField,datePicker])
        stackView.axis = .vertical

        view.addSubview(stackView)
        stackView.translatesAutoresizingMaskIntoConsTraints = false
        NSLayoutConsTraint.activate([
            stackView.topAnchor.consTraintEqualToSystemSpacingBelow(view.safeAreaLayoutGuide.topAnchor,multiplier: 1),stackView.leadingAnchor.consTraintEqualToSystemSpacingAfter(view.safeAreaLayoutGuide.leadingAnchor,view.safeAreaLayoutGuide.TrailingAnchor.consTraintEqualToSystemSpacingAfter(stackView.TrailingAnchor,multiplier: 1)
        ])
    }

}