Swift 2 didSelectRowAtIndexPath UIAlertController 使用 4 个字符串将 segue 推送到 TVC

Question

我在将四个标签的值从警报控制器传递到另一个 tableViewController 中的新单元格时遇到了一些问题。我不确定我是否使用最佳方法将其传递给“添加”操作。

这里是相关的sn-ps ->

ProductTableViewController.swift

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! ProductTableViewCell
    // Get the row data for the selected row
    let product = frc.objectAtIndexPath(indexPath) as! ProductItem

    cell.productcodeLabel.text = product.productcode
    cell.detailLabel.text = product.detail
    cell.quantityLabel.text = "MOQ \(product.quantity as! Double)"
    cell.barcodeLabel.text = product.barcode

 //MARK: - Add Item Alert
    var quantityTextField = UITextField()

    let alertController = UIAlertController(title: "\(product.detail!)\n \("MOQ \(product.quantity as! Double)")", message: nil, preferredStyle: .Alert)
    let cancelAction = UIAlertAction(title: "Cancel", style: .Default, handler: {(alert: UIAlertAction!) in print("Cancel Button Pressed")
         alertController.dismissViewControllerAnimated(true, completion: nil)
    })

    let action = UIAlertAction(title: "Add", style: .Default, handler: { (action) -> Void in
        // Now do whatever you want with inputTextField (remember to unwrap the optional)
        quantityTextField = alertController.textFields![0] as UITextField
        print("Add Button Pressed")
        print("You entered \(product.productcode!) \(quantityTextField.text!)")

        let storyBoard = UIStoryboard(name: "Main", bundle: nil)
        let orderVC = storyBoard.instantiateViewControllerWithIdentifier("addProduct") as! OrderViewController
        orderVC.productcodeString = product.productcode! as String!
        orderVC.detailString = product.detail! as String!
        orderVC.quantityString = quantityTextField.text! as String!
        orderVC.barcodeString = product.barcode! as String!

        self.navigationController?.pushViewController(orderVC, animated: true)


    })

        alertController.addTextFieldWithConfigurationHandler{ (quantityTextField) -> Void in
        quantityTextField.placeholder = "Enter quantity here..."
        quantityTextField.font = UIFont.systemFontOfSize(15)
        quantityTextField.autocorrectionType = UITextAutocorrectionType.No
        quantityTextField.keyboardType = UIKeyboardType.NumberPad
        quantityTextField.returnKeyType = UIReturnKeyType.Done
        quantityTextField.clearButtonMode = UITextFieldViewMode.WhileEditing;
        quantityTextField.contentVerticalAlignment = UIControlContentVerticalAlignment.Center
        quantityTextField.delegate = self

        }


    alertController.addAction(cancelAction)
    alertController.addAction(action)

    self.presentViewController(alertController, animated: true, completion:{})

    }

OrderViewController.swift

class OrderViewController: UITableViewController{

var productcodeString = String()
var detailString = String()
var quantityString = String()
var barcodeString = String()

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("OrderCell", forIndexPath: indexPath) as! OrderTableViewCell

    // Configure the cell...
    cell.productcodeLabel.text = productcodeString
    cell.detailLabel.text = detailString
    cell.quantityLabel.text = "X \(quantityString)"
    cell.barcodeLabel.text = barcodeString

    return cell
   }

segue“addProduct”是从 productTVC 中提取的，以作为情节提要中的 orderVC tableviews 的显示细节 segue。

我在控制台中得到一个 LLDB 就行了 让 orderVC = storyBoard.instantiateViewControllerWithIdentifier("addProduct") 为！订单视图控制器 警告：无法从 dyld 共享缓存加载任何 Objective-C 类信息。这将显着降低可用类型信息的质量。

我希望有人可以帮助我完成这部戏剧，因为我有点失落。

Answer 1

我对你试图用你的代码实现的目标感到很困惑。但是，无需尝试进一步分析，我可以就流程应该如何向您提供一些建议。你应该在这里调用的方法是prepareForSegue

当didSelectRowAtIndexPath 触发时，您执行转场addProduct

然后从prepareForSegue你传递信息

override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
    if (segue.identifier == "addProduct") {
        let destination = segue.destinationViewController as! OrderViewController
        let indexPath = tableView.indexPathForSelectedRow
        let product = frc.objectAtIndexPath(indexPath) as! ProductItem
        destination.productcodeString = product.productcode as! String
    }
}

Answer 2

嗨，克里斯，感谢您发布的解决方案。我尝试了您提供的内容，不仅它也引发了错误，而且我的扫描仪segue也坏了。我想一张照片可以澄清我想要弄清楚的事情。正如您所看到的，当一个单元格被选中时，会弹出一个带有文本框的警报视图来接受一个数量，然后按下 Add 按钮来调用带有所有数据的 OrderViewController 的 segue。如果没有来自 alertView 的数据，我什至无法让它继续运行。

接下来我将尝试构建一个 orderDelegate 并专注于让 segue 在不崩溃的情况下触发。

Answer 3

终于让segue现在正常工作了！ 这是实际传递四个字符串的最终配置。希望对其他人有所帮助...

在 OrderViewController 中：

var passedProductcode = String()
var passedDetail = String()
var passedQuantity = String()
var passedBarcode = String()

ProductTableViewController 中的 DidSelectRowAtIndex 方法：

var selectedPC:String?
var selectedD:String?
var selectedQ:String?
var selectedBC:String?

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    tableView.deselectRowAtIndexPath(indexPath, animated: true) //Required!
    let product = frc.objectAtIndexPath(indexPath) as! ProductItem

    var quantityTextField = UITextField()

    let alertController = UIAlertController(title: "\(product.detail!)" , message: "\("Minimum Order Quantity = \(product.quantity!)")", preferredStyle: .Alert)
    let cancelAction = UIAlertAction(title: "Cancel", style: .Default, handler: {(alert: UIAlertAction!) in print("Cancel Button Pressed")
        alertController.dismissViewControllerAnimated(true, completion: nil)
    })

    let action = UIAlertAction(title: "Add", style: .Default, handler: { action in
        quantityTextField = alertController.textFields![0] as UITextField
        //print("Add Button Pressed")
        //print("You entered \(product.productcode!) \(quantityTextField.text!)")

        self.selectedPC = product.productcode!
        self.selectedD = product.detail!
        self.selectedQ = quantityTextField.text!//product.quantity!
        self.selectedBC = product.barcode!
        //print("DSRAIP: \(self.selectedPC!)")
        //print("DSRAIP: \(self.selectedD!)")
        //print("DSRAIP: \(self.selectedQ!)")
        //print("DSRAIP: \(self.selectedBC!)")

        self.performSegueWithIdentifier("addProduct", sender: self)

    })

    alertController.addTextFieldWithConfigurationHandler{ (quantityTextField) -> Void in
        quantityTextField.placeholder = "Enter quantity here..."
        quantityTextField.font = UIFont.systemFontOfSize(15)
        quantityTextField.autocorrectionType = UITextAutocorrectionType.No
        quantityTextField.keyboardType = UIKeyboardType.NumberPad
        quantityTextField.returnKeyType = UIReturnKeyType.Done
        quantityTextField.clearButtonMode = UITextFieldViewMode.WhileEditing;
        quantityTextField.contentVerticalAlignment = UIControlContentVerticalAlignment.Center
        quantityTextField.delegate = self
    }

    alertController.addAction(cancelAction)
    alertController.addAction(action)

    self.presentViewController(alertController, animated: true, completion:{})

    }

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "scanner" {
    let scannerViewController: ScannerViewController = segue.destinationViewController as! ScannerViewController
    scannerViewController.delegate = self
    print ("Scanner Segue!")
    } else if segue.identifier == "addProduct" {
       print ("Add Item Segue!")
            let destination = segue.destinationViewController as! OrderViewController
            //print("Segue: \(selectedPC!)")
            //print("Segue: \(selectedD!)")
            //print("Segue: \(selectedQ!)")
            //print("Segue: \(selectedBC!)")
            destination.passedProductcode = (selectedPC)!
            destination.passedDetail = (selectedD)!
            destination.passedQuantity = (selectedQ)!
            destination.passedBarcode = (selectedBC)!
            }
      }