我正在尝试寻找一种“更简洁优雅”的方式在 UIViewController 之间传递数据。因此，我决定继续使用委托(delegate)和协议(protocol)。但是，我未能收到协议(protocol)提供的数据。我做错了什么？
尝试接收协议(protocol)数据并使用它来填充 UITableView:
class ViewController: UIViewController, CLLocationManagerDelegate, UITableViewDataSource, dataReceivedDelegate {
func dataReceived(nome: String, foto: UIImage, qtd: Int) {
nomeReceived = nome
self.qtd = qtd
self.itensTableView.reloadData()
}
@IBOutlet weak var itensTableView: UITableView!
var arrayNomes = NSMutableArray()
var nomeReceived = ""
var qtd:Int = 0
var objetos = [Objeto]()
//TableView
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
// let item = objetos[indexPath.row]
let cell = itensTableView.dequeueReusableCell(withIdentifier: "cellId", for: indexPath) as! tableviewCell
cell.nameCell.text = nomeReceived //Nil value
// cell.imageViewCell.image = item.foto //Nil value
return cell
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return qtd
}
override func viewDidAppear(_ animated: Bool) {
let controller = storyboard?.instantiateViewController(withIdentifier: "addVc") as! adicionarNovoItemVc
controller.delegate = self
}
为协议(protocol)创造和设定值(value):
import UIKit
protocol dataReceivedDelegate {
func dataReceived(nome:String,foto:UIImage,qtd:Int)
}
class adicionarNovoItemVc: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UITextFieldDelegate {
@IBOutlet weak var textFieldNome: UITextField!
let imagePicker = UIImagePickerController()
@IBOutlet weak var namePreview: UILabel!
@IBOutlet weak var imagePreview: UIImageView!
let picker = UIImagePickerController()
var delegate:dataReceivedDelegate?
override func viewDidLoad() {
super.viewDidLoad()
self.textFieldNome.delegate = self
// Do any additional setup after loading the view.
}
@IBAction func botaoAdcItem(_ sender: UIButton) {
if (self.namePreview!.text != nil) && (self.imagePreview!.image != nil) {
delegate?.dataReceived(nome: self.namePreview.text!, foto: self.imagePreview.image!, qtd: 1)
self.navigationController?.popViewController(animated: true)
}
else {return}
}
最佳答案
在您的 ViewController 中向按钮添加一个操作，
func buttonAction(sender: UIButton!) {
let storyboard = UIStoryboard.init(name: "yourStoryboarName", bundle: nil)
let controller = storyboard.instantiateViewController(withIdentifier: "addVc") as! adicionarNovoItemVc
controller.delegate = self
self.navigationController?.pushViewController(controller, animated: true)
}
一旦新 Controller 被推送到屏幕上，您就可以执行“botaoAdcItem”操作，其余的将获得您预期的结果。
关于ios - 我在使用协议(protocol)传递数据时做错了什么，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/51227932/