DatePicker传递数据

Question

我有一个成功的日期选择器，在下面的页面上有一个stepper/number选择器，允许用户选择日期和项目数量。在新的视图中，我想显示所有以前的信息，供他们查看。我有一些适当的方法，但它们似乎不起作用。我猜这是因为它们不是textFields，并且需要一些额外的代码来请求UIdatepicker和Stepper传递信息。请看下面:)

这是我的日期选择器视图控制器

import UIKit

class StoreDatesViewController: UIViewController {

  
    @IBOutlet weak var nextButton: UIButton!
    
    @IBOutlet weak var dropOff: UITextField!
    
    @IBOutlet weak var pickUp: UITextField!
    
    
    
    
    let datePicker = UIDatePicker()

     override func viewDidLoad() {
       super.viewDidLoad()
        showDatePicker()
         
         
     }
    
    override func viewWillAppear(_ animated: Bool) {
        nextButton.isEnabled = true
    }
    


     func showDatePicker(){
       //Format Date
       datePicker.datePickerMode = .date
         datePicker.preferredDatePickerStyle = .inline
         datePicker.backgroundColor = UIColor(named: "yellow-2")
         
         

      //ToolBar
         
   
         
      let toolbar = UIToolbar();
      toolbar.sizeToFit()
         
         let toolbar2 = UIToolbar();
             toolbar2.sizeToFit()
         
      let doneButton = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(donedatePicker));
         
         
         
     let cancelButton = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(cancelDatePicker));
         
         let doneButton2 = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(donedatePicker2));
            
        let cancelButton2 = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(cancelDatePicker2));

         toolbar.setItems([doneButton,cancelButton], animated: false)
         toolbar.tintColor = .white
         toolbar.backgroundColor = .red
         
    
         toolbar2.setItems([doneButton2,cancelButton2], animated: false)
         toolbar2.tintColor = .white
         
         dropOff.inputAccessoryView = toolbar
         dropOff.inputView = datePicker
         
         pickUp.inputAccessoryView = toolbar2
         pickUp.inputView = datePicker
         
        
}

     @objc func donedatePicker(){

      let formatter = DateFormatter()
      formatter.dateFormat = "dd/MM/yyyy"
         dropOff.text = formatter.string(from: datePicker.date)
      self.view.endEditing(true)
    }
    
    @objc func donedatePicker2(){

     let formatter = DateFormatter()
     formatter.dateFormat = "dd/MM/yyyy"
        pickUp.text = formatter.string(from: datePicker.date)
     self.view.endEditing(true)
   }

    @objc func cancelDatePicker(){
       self.view.endEditing(true)
     }
    
    @objc func cancelDatePicker2(){
       self.view.endEditing(true)
     }
    
    @IBAction func didTapNext() {
        let dropOff = dropOff.text
        let pickUp = pickUp.text
        let storeDetailsVC = self.storyboard?.instantiateViewController(withIdentifier: "storeDetailsVC") as! storeDetailsViewController
        storeDetailsVC.dropOff = dropOff!
        storeDetailsVC.pickUp = pickUp!
    }
    
   }

这是我的数字选择视图控制器

import UIKit

class StoreQuantityViewController: UIViewController{
   
   

   @IBOutlet weak var numbers: UILabel!
   
   override func viewDidLoad() {
       super.viewDidLoad()

   }
   

   @IBAction func stepper(_ sender: UIStepper) {
       numbers.text = String(Int(sender.value))
           
       }
   
   @IBAction func next(_ sender: Any) {
       let data2 = numbers.text
       let storeDetailsVC = self.storyboard?.instantiateViewController(withIdentifier: "storeDetailsVC") as! storeDetailsViewController
       storeDetailsVC.data2 = data2!
       self.navigationController?.pushViewController(storeDetailsVC, animated: true)
       
   }
}
    ```

Answer 1

您需要将信息从文本字段传递到下一个视图中的字符串。

解决方案1：

 override func viewDidLoad() {
   super.viewDidLoad()
    pickUp.text = currentDate // This you can create using the date formatter
    dropOff.text = defaultDate // This is default date value you can set if needed
    showDatePicker()        
 }

解决方案2：

 @IBAction func didTapNext() {
      //Apply validation here to check if its empty if no default value provided.
     if dropOff.text.isEmpty { 
        //Show alert to user to select drof off date.
        return
     }

     if pickUp.text.isEmpty { 
        //Show alert to user to select PickUp date.
        return
     }
     
     let dropOff = dropOff.text
     let pickUp = pickUp.text
     let storeDetailsVC = self.storyboard?.instantiateViewController(withIdentifier: "storeDetailsVC") as! storeDetailsViewController
     storeDetailsVC.dropOff = dropOff!
     storeDetailsVC.pickUp = pickUp!
 }