Question

在我的应用程序中，我使用segue在两个视图控制器之间传递数据，这应该很容易，但由于原因我无法看到我一直在那里＆＃34;未解析的标识符＆＃34;

她是与该功能有关的一些代码。

来自ViewController 1的

import UIKit
import CoreData

class ViewController: UIViewController, UITextFieldDelegate
{

@IBOutlet var panelWidthTextField: UITextField!
@IBOutlet var panelHightTextField: UITextField!
@IBOutlet var panelsWideTextField: UITextField!
@IBOutlet var panelsHightTextField: UITextField!
@IBOutlet var panelPitchTextField: UITextField!
@IBOutlet var calculateButton: UIButton!
@IBOutlet var resultWithLabel: UILabel!
@IBOutlet var resultHightLabel: UILabel!
@IBOutlet var fillAllFieldsLabel: UILabel!

var pawidth:String!
var pahight:String!
var papitch:String!

override func viewDidLoad()
{
    super.viewDidLoad()

    panelWidthTextField.text = pawidth
    panelHightTextField.text = pahight
    panelPitchTextField.text = pap itch

来自Second ViewController

import UIKit
import CoreData

class DataBase: UIViewController, UITextFieldDelegate

{
@IBOutlet var makerTextField: UITextField!
@IBOutlet var modelTextField: UITextField!
@IBOutlet var stPanelWidthTextField: UITextField!
@IBOutlet var stPanelHightTextField: UITextField!
@IBOutlet var stPitchTextField: UITextField!

let moc = (UIApplication.sharedApplication().delegate as!     AppDelegate).managedObjectContext


// Removes keyboard when touch outside edit field.
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?)
{
    view.endEditing(true)
    super.touchesBegan(touches, withEvent: event)

}

@IBAction func saveButton(sender: UIButton)
{
    let ed = NSEntityDescription.entityForName("Ledinfo", inManagedObjectContext: moc)
    let model = Ledinfo(entity:ed!, insertIntoManagedObjectContext:moc)

    model.manufactor = makerTextField.text
    model.model = modelTextField.text
    model.panelwidth = stPanelWidthTextField.text
    model.panelhight = stPanelHightTextField.text
    model.pitch = stPitchTextField.text

    do  {
        try moc.save()
        makerTextField.text = ""
        modelTextField.text = ""
        stPanelWidthTextField.text = ""
        stPanelHightTextField.text = ""
        stPitchTextField.text = ""
        Alert.show("Succsess", message: "Your Record Is Saved", vc: self)


    }
    catch _ as NSError
    {
        Alert.show("Failed", message: "Something Went Wrong", vc: self)
    }


}

@IBAction func searchButton(sender: UIButton)
{
    let ed = NSEntityDescription.entityForName("Ledinfo", inManagedObjectContext: moc)

    let req = NSFetchRequest()
    req.entity = ed

    let cond = NSPredicate(format: "manufactor = %@", makerTextField.text!)
    req.predicate = cond


    do {

        let result = try moc.executeFetchRequest(req)

        if result.count > 0
        {
            let model = result[0] as! Ledinfo
            makerTextField.text = model.manufactor
            modelTextField.text = model.model
            stPanelWidthTextField.text = model.panelwidth
            stPanelHightTextField.text = model.panelhight
            stPitchTextField.text = model.pitch


        } else
        {

        Alert.show("Failed", message: "No Record Is Found", vc: self)

    }

    } catch _ as NSError!

    {
        Alert.show("Failed", message: "No Record Is Found" , vc: self)

    }

}

@IBAction func transfereButton(sender: UIButton) {

}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {

    if (segue.identifier == "transfereButton") {
        let svc = segue.destinationViewController as! ViewController


        svc.pawidth = stPanelWidthTextField.text
        svc.pahight = stPanelHightTextField.text
        svc.papitch = stPitchTextField.text

                }
}


}

找不到panelWidthTextField.text，panelHightTextField.text和panelPitchTextField.text作为标识符。

我检查拼写，似乎无法找到遗漏的内容。

感谢任何帮助

Answer 1

＆＃34; Segue公司＆＃34;意味着，准备在那里＆＃34; prepareForSegue＆＃34;方法您将ViewController的属性设置为DataBase控制器中的某些数据。在您的示例中，可以这样做：

svc.pawidth = someDataFromDataBaseWhichYouWantToPassToSecondVC
svc.pahight = someDataFromDataBaseWhichYouWantToPassToSecondVC
svc.papitch = someDataFromDataBaseWhichYouWantToPassToSecondVC

然后，您可以从ViewController类操作此数据。您错误地认为您没有将数据从一个VC传递到另一个VC，而不是您尝试将1stVC的属性设置为1stVC的另一个属性，并且不需要segue。

Answer 2

这与segues无关。您的DataBase课程中是否有3个文字字段，其中包含panelWidthTextField，panelHightTextField和panelPithcTextField？它抱怨无法找到这些变量。

Answer 3

您应该调用performSegueWithIdentifier("transfereButton", sender: nil) IBOutlet操作中的transfereButton来实际运行prepareForSegue。

传递数据时使用segue的未解析标识符

3 个答案: