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Ich arbeite derzeit an einer Inventar App, die Informationen für zwei Entitäten enthalten wird. Die erste Entität enthält zwei Attribute "Site-Name" und "Site-Adresse". Die zweite Entität enthält "itemName" "itemQuantity" und "item picture". Ich kann die Daten in den Kerndaten speichern. Ich habe gerade Probleme mit dem Abrufen der Daten. Kann jemand Daten zwischen den View-Controllern übertragen?übergeben Kerndaten zwischen Ansichten swift
Ich lade den Site View-Controller, den Detailansicht-Controller und meinen neuen Elementansicht-Controller hoch.
class SiteTableViewController: UIViewController {
var managedContext : NSManagedObjectContext = CoreDataHelper.sharedInstance.myContext
var sites : [Site]? = [Site]()
//variable to hold selected site
var selectedSite : Site?
let myCellIdentifier = "cell"
@IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
// Do any additional setup after loading the view.
sites = [Site]()
reloadData()
automaticallyAdjustsScrollViewInsets = false
//let barButtonItem = UIBarButtonItem(barButtonSystemItem: .Compose, target: self, action: "addSite:")
//self.navigationItem.leftBarButtonItems = [barButtonItem]
}
//load new data into table
func reloadData() {
let fetchRequest = NSFetchRequest(entityName: "Site")
let sortDescriptor = NSSortDescriptor(key: "siteName", ascending: true)
fetchRequest.sortDescriptors = [sortDescriptor]
do {
sites = try self.managedContext.executeFetchRequest(fetchRequest) as! [Site]
tableView.reloadData()
} catch {
print("Error fetching objects")
}
tableView.reloadData()
}
override func viewWillAppear(animated: Bool) {
reloadData()
}
}
extension SiteTableViewController: UITableViewDataSource, UITableViewDelegate {
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier(myCellIdentifier, forIndexPath: indexPath)
let site = sites![indexPath.row]
cell.textLabel?.text = site.valueForKey("siteName") as? String
cell.detailTextLabel?.text = site.valueForKey("siteAddress") as? String
return cell
}
func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
return true
}
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == .Delete {
let logItemToDelete = sites![indexPath.row]
sites?.removeAtIndex(indexPath.row)
managedContext.deleteObject(logItemToDelete)
do {
try managedContext.save()
} catch {
print("Could not save or delete object")
}
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
}
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return sites!.count
}
// func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
//
// selectedSite = sites![indexPath.row]
//
// }
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "detailSegue" {
var nextVC = segue.destinationViewController as! DetailTableViewController
var selectedItem : Site = sites![self.tableView.indexPathForSelectedRow!.row] as Site
fetchSite = selectedItem.valueForKey("siteName") as? NSManagedObject
nextVC.valueToPass = selectedItem.siteName!
}
}
}
hier ist meine Detailansicht Controller
Import UIKit Import Coredata
public var fetchSite: NSManagedObject?
Klasse DetailTableViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var holdSiteData: NSMutableArray = NSMutableArray()
var managedContext : NSManagedObjectContext = CoreDataHelper.sharedInstance.myContext
@IBOutlet weak var tableView: UITableView!
var sites : [Site]!
//string to hold fetchResults controll
//open string to hold siteName
var valueToPass = ""
override func viewDidLoad() {
super.viewDidLoad()
self.navigationItem.title = "\(valueToPass)"
// Do any additional setup after loading the view.
tableView.delegate = self
tableView.dataSource = self
automaticallyAdjustsScrollViewInsets = false
tableView.estimatedRowHeight = 75.0
tableView.rowHeight = UITableViewAutomaticDimension
retrieveItemRelationship()
}
override func viewWillAppear(animated: Bool) {
retrieveItemRelationship()
}
func retrieveItemRelationship() {
// fetchSite.setValue(NSSet(keyCommands), forKey: "test")
let fetchRequest = NSFetchRequest(entityName: "SiteItem")
let sortDescriptors = NSSortDescriptor(key: "itemName", ascending: true)
fetchRequest.sortDescriptors = [sortDescriptors]
do {
let result = try fetchSite?.managedObjectContext?.executeRequest(fetchRequest)
} catch let error as NSError {
print(error)
}
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! TableViewCell
// let cellInfo = fetchedResultsController.objectAtIndexPath(indexPath) as! SiteInfo
cell.cellName?.text = "Test"
return cell
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return holdSiteData.count
}
}
dies meine letzte Ansicht ist, um die Daten zu speichern. Ich dachte, ich muss die Daten hier übergeben und dann die beiden Entitäten zuordnen, damit ich sie richtig speichern kann. Zum Beispiel für den Site-Namen "Staples Center". Ich muss dies zum letzten View-Controller ziehen und dann die Informationen zu diesem Objekt speichern.
import UIKit
import CoreData
class ItemNewViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
//var managedObjectContext : NSManagedObjectContext!
var managedContext : NSManagedObjectContext = CoreDataHelper.sharedInstance.myContext
//categories array for picker view
var categories = ["Building Materials", "Electrical", "Cleaning Products",
"Tools & Hardware", "Plumbing", "Paint", "Appliances", "Other"]
//textFields
@IBOutlet weak var itemNameTextField: UITextField!
@IBOutlet weak var quantityTextField: UITextField!
@IBOutlet weak var imageView: UIImageView!
//Label properties
@IBOutlet weak var newItemLabel: UILabel!
@IBOutlet weak var quantityLabel: UILabel!
@IBOutlet weak var categoryLabel: UILabel!
//pickerLabel
@IBOutlet weak var pickerListIcon: UIPickerView!
//clicker property label and textlabel for number
@IBOutlet weak var increaseNumberClicker: UIStepper!
@IBOutlet weak var numberFieldClicker: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
//label property customize view code
newItemLabel.layer.masksToBounds = true
newItemLabel.layer.borderWidth = 2.0
newItemLabel.layer.borderColor = UIColor.whiteColor().CGColor
newItemLabel.layer.cornerRadius = 6
//label property customize view code
quantityLabel.layer.masksToBounds = true
quantityLabel.layer.borderWidth = 2.0
quantityLabel.layer.borderColor = UIColor.whiteColor().CGColor
quantityLabel.layer.cornerRadius = 6
//lable property customize view code
categoryLabel.layer.masksToBounds = true
categoryLabel.layer.borderWidth = 3.0
categoryLabel.layer.borderColor = UIColor.whiteColor().CGColor
categoryLabel.layer.cornerRadius = 6
//label picker customize view
pickerListIcon.layer.masksToBounds = true
pickerListIcon.layer.borderWidth = 3.0
pickerListIcon.layer.borderColor = UIColor.whiteColor().CGColor
pickerListIcon.layer.cornerRadius = 6
pickerListIcon.layer.backgroundColor = UIColor.blackColor().CGColor
self.pickerListIcon.dataSource = self
self.pickerListIcon.delegate = self
numberFieldClicker.enabled = false
//UIStepper value
increaseNumberClicker.wraps = true
increaseNumberClicker.autorepeat = true
increaseNumberClicker.layer.masksToBounds = true
increaseNumberClicker.layer.borderWidth = 3.0
increaseNumberClicker.layer.borderColor = UIColor.whiteColor().CGColor
increaseNumberClicker.layer.cornerRadius = 6
increaseNumberClicker.layer.backgroundColor = UIColor.blackColor().CGColor
//below code declares a variable that inherits from UITapGesture
//this allows the image view to be an action
//*Make sure you enable user interaction in storyBoard very IMPORTANT!
let imageTapRecognizer = UITapGestureRecognizer(target: self, action: "enableImage")
self.imageView.addGestureRecognizer(imageTapRecognizer)
}
// below function allows the camera view to be accessible
func enableImage(){
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera) {
let cameraView = UIImagePickerController()
cameraView.sourceType = UIImagePickerControllerSourceType.Camera
cameraView.delegate = self
self.presentViewController(cameraView, animated: true, completion: nil)
}
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
self.imageView.image = image
picker.dismissViewControllerAnimated(true, completion: nil)
}
//function used to increase UIStepper. increment by integers of one
@IBAction func clickerIncreaser(sender: UIStepper) {
numberFieldClicker.text = Int(sender.value).description
}
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return categories.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return categories[row]
}
func pickerView(pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? {
//passing the categorories array into the new constant myCategoriesArray
let myCategoriesArray = categories[row]
let myTextColor = NSAttributedString(string: myCategoriesArray, attributes: [NSForegroundColorAttributeName: UIColor.whiteColor()])
return myTextColor
}
//save data to core data
@IBAction func saveButton(sender: AnyObject) {
if (itemNameTextField.text?.isEmpty)! {
let displayAlertController = UIAlertController(title: "Form Incomplete", message: "Please provide item with a name", preferredStyle: .Alert)
let okButton : UIAlertAction = UIAlertAction(title: "OK", style: .Default, handler: nil)
displayAlertController.addAction(okButton)
self.presentViewController(displayAlertController, animated: true, completion: nil)
} else {
//declare site object and object
let siteInfoEntity = NSEntityDescription.entityForName("SiteItem", inManagedObjectContext: self.managedContext)
//declare item and item object
let siteObject = SiteItem(entity: siteInfoEntity!, insertIntoManagedObjectContext: self.managedContext)
//convert String to Integer
let quantityNumber: Int? = Int(quantityTextField.text!)
siteObject.setValue(itemNameTextField.text?.capitalizedString, forKey: "itemName")
siteObject.setValue(quantityNumber, forKey: "itemQnty")
fetchSite?.setValue(NSSet(object: siteObject), forKey: "reverseItems")
self.managedContext.saveOrLogError()
self.navigationController?.popViewControllerAnimated(true)
}
}
}
Noch einmal, wenn jemand mich in die richtige Richtung meine Beziehungen zu den Kerndaten zum Speichern und Abrufen dieser Beziehungen wäre toll verweisen. Noch neu zu den Kerndaten, also brauche ich alle Hilfe, die ich bekommen kann!
Danke
Zu viel Code. Reduzieren Sie und zeigen Sie nur das an, was Ihrer Meinung nach für die Frage relevant ist. – Mundi