如何定制快速纤维素酶

Question

你好，我是乞讨者，我得到了一个错误，“不能将‘字符’类型的值赋值给'String'”，如何修复我的大脑在这个代码博客enter code here中丢失的问题？

进口UIKit FirebaseFirestore进口FirebaseAuth进口FirebaseDatabase进口FirebaseStorage

类PhoneViewController: UIViewController {

@IBOutlet weak var tableView: UITableView!

var phoneModelText = [String]()
var imeiAdressText = [String]()
var userNameText = [String]()
var idText = [String]()
var phoneNumberText = [String]()
var detailsText = [String]()
var dateText = [String]()
var priceText = [String]()
var adressText = [String]()


var selectedPhoneModelText = ""
var selectedimeiAdressText = ""
var selecteduserNameText = ""
var selectedidText = ""
var selectedphoneNumberText = ""
var selecteddetailsText = ""
var selecteddateText = ""
var selectedpriceText = ""
var selectedadressText = ""

override func viewDidLoad() {
    super.viewDidLoad()
    navigationController?.navigationBar.prefersLargeTitles = true
    tableView.dataSource = self
    tableView.delegate = self
    getdata()
    
    
}

func makeAlert(titleInput: String, messageInput : String) {
    let alert = UIAlertController(title: titleInput, message: messageInput, preferredStyle: UIAlertController.Style.alert)
    let okButton = UIAlertAction(title: "Ok", style: UIAlertAction.Style.default, handler: nil)
    alert.addAction(okButton)
    present(alert, animated: true, completion: nil)
}



func fetchBook(documentId: String) {
    let db = Firestore.firestore()
  let docRef = db.collection("Databases").document(documentId)
  docRef.getDocument { document, error in
    if let error = error as NSError? {
        self.makeAlert(titleInput: "alert", messageInput: "\(error.localizedDescription)")
    }
    else {
      if let document = document {
        let id = document.documentID
        let data = document.data()
        let phonemodel = data?["phoneName"] as? String ?? ""
        let imeiadress = data?["imeiNumberText"] as? Int ?? 0
        let username = data?["userNameText"] as? String ?? ""
        let idcard = data?["idCardtext"] as? Int ?? 0
        let phonenumber = data?["phoneNumberText"] as? Int ?? 0
        let adress = data?["adressNameText"] as? String ?? ""
        let details = data?["detailSectionText"] as? String ?? ""
        let date = data?["currentDateText"] as? String ?? ""
        let price = data?["priceValueText"] as? Int ?? 0
        let image = data?["imageurl"] as? String ?? ""
          
          

          DispatchQueue.main.async {
              self.selectedphoneNumberText = phonemodel
              
              
              
             self.phoneModelText.text = phonemodel
              self.imeiAdressText.text = String(imeiadress)
              self.userNameText.text = username
              self.idText.text = String(idcard)
              self.phoneNumberText.text = String(phonenumber)
              self.adressText.text = adress
              self.detailsText.text = details
              self.dateText.text = date
              self.priceText.text = String(price)

          }

      }
    }

  }
}

}

扩展PhoneViewController : UITableViewDataSource，UITableViewDelegate {

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return phoneModelText.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = UITableViewCell()
    cell.textLabel?.text = phoneModelText[indexPath.row]
    return cell
}



func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    // how i customizing there
    

  
           performSegue(withIdentifier: "toPhoneListView", sender: nil)
    }

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "toPhoneListView" {
        let destinationVC = segue.destination as! PhoneListViewController
        destinationVC.selectedPhoneModelText
        destinationVC.selectedimeiAdressText
        destinationVC.selecteduserNameText
        destinationVC.selectedidText
        destinationVC.selectedphoneNumberText
        destinationVC.selecteddetailsText
        destinationVC.selecteddateText
        destinationVC.selectedpriceText
        destinationVC.selectedadressText
       }
   }

}

Answer 1

这就是如何定义phoneModelText的方法

var phoneModelText = [String]()

这表明phoneModelText是一个字符串数组，因此它看起来如下所示

phoneModelText[0] = "Some String"
phoneModelText[1] = "Another string"

但之后，您将尝试将字符串分配给该数组

self.phoneModelText.text = phonemodel

这不是数组的工作方式。如果要将phoneModel添加到数组中，则如下所示

self.phoneModelText.append(phoneModel) //assume phoneModel = "yet another string"

那么数组就会如下所示

phoneModelText[0] = "Some String"
phoneModelText[1] = "Another string"
phoneModelText[2] = "yet another string"

通常，我建议命名您的vars，以便它们更多地表示它们包含的内容--而不是phoneModelText，称为phoneModelTextArray。这将减少混乱，并使代码更具可读性。

至于解决方案，还不清楚为什么会有一堆数组

var phoneModelText = [String]()
var imeiAdressText = [String]()
var userNameText = [String]()

但我建议你改变这一切。一种选择是定义一个具有属性的类，然后拥有一个类数组。

class ContactClass {
   var id = ""
   var phoneText = ""
   var imeiAdressText = ""
   var userNameText = ""
}

然后是控制器中的类数组。

var contactArray = [ContactClass]()

最后，在从Firebase读取数据时，实例化类，填充类属性并将类添加到数组中

else {
  if let document = document {
    let contact = ContactClass()
    
    contact.id = document.documentID
    contact.phoneText = data?["phoneName"] as? String ?? ""
    contact.imeiAdressText = data?["imeiNumberText"] as? Int ?? 0
    contact.userNameText = data?["userName"] as? String ?? ""
    
    self.contactArray.append(contact)