0
所以我有這個xCode
項目我正在努力製作一個Swift
語言的iPhone應用程序。我試圖在一個對象中存儲兩個字符串,一個二進制數據圖像,我可以在這個viewcontroller
中檢索到核心數據。我用來轉換到這個視圖的表格視圖顯示了正確的項目關聯,但是當我加載這個視圖時,這些屬性沒有加載。爲什麼對象沒有被上傳並顯示到viewcontroller
?爲什麼我的CoreData對象不能被My View Controller檢索
import UIKit
import CoreData
class IndividualMainViewController: UIViewController, NSFetchedResultsControllerDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate
{
@IBOutlet weak var backCancelButton: UIBarButtonItem!
@IBOutlet weak var saveEditButton: UIBarButtonItem!
@IBOutlet weak var deviceImageButton: UIButton!
@IBOutlet weak var cameraImageButton: UIButton!
var item: Item? = nil
let moc = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
let frc: NSFetchedResultsController = NSFetchedResultsController()
@IBOutlet weak var imageHolder: UIImageView!
@IBOutlet weak var horseName: UITextField!
@IBOutlet weak var officialName: UITextField!
override func viewDidLoad()
{
super.viewDidLoad()
if(item == nil)
{
print("item returned nil")
print(item)
}
else
{
print("Object did load")
self.horseName.text = item?.name
self.officialName.text = item?.offName
self.imageHolder.image = UIImage(data: (item?.image)!)
saveEditButton.title = "Edit"
backCancelButton.title = "To Barn"
self.deviceImageButton.hidden = true
self.cameraImageButton.hidden = true
}
let tap: UIGestureRecognizer = UITapGestureRecognizer(target: self, action: "dismissEditor")
view.addGestureRecognizer(tap)
}
override func didReceiveMemoryWarning()
{
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func dismissEditor()
{
view.endEditing(true)
}
@IBAction func addImageFromDevice(sender: AnyObject)
{
let pickerController = UIImagePickerController()
pickerController.delegate = self
pickerController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
pickerController.allowsEditing = true
self.presentViewController(pickerController, animated: true, completion: nil)
}
@IBAction func addImageFromCamera(sender: AnyObject)
{
let pickerController = UIImagePickerController()
pickerController.delegate = self
pickerController.sourceType = UIImagePickerControllerSourceType.Camera
pickerController.allowsEditing = true
self.presentViewController(pickerController, animated: true, completion: nil)
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?)
{
self.dismissViewControllerAnimated(true, completion: nil)
self.imageHolder.image = image
}
@IBAction func saveEditTapped(sender: AnyObject)
{
if(saveEditButton.title == "Save")
{
if item != nil
{
editItem()
print("Item edit saved")
saveEditButton.title = "Edit"
backCancelButton.title = "To Barn"
}
else
{
createNewItem()
print("New item created")
performSegueWithIdentifier("back", sender: nil)
}
}
else
{
saveEditButton.title = "Save"
backCancelButton.title = "Cancel"
print("Not saved")
}
}
func createNewItem()
{
let entityDescription = NSEntityDescription.entityForName("Item", inManagedObjectContext: moc)
let item = Item(entity: entityDescription!, insertIntoManagedObjectContext: moc)
item.name = horseName.text
item.offName = officialName.text
item.image = UIImagePNGRepresentation(imageHolder.image!)
do
{
try self.moc.save()
}
catch
{
print("Failed ot create new object")
return
}
}
func editItem()
{
item?.name = horseName.text
item?.offName = officialName.text
item!.image = UIImagePNGRepresentation(imageHolder.image!)
do
{
try self.moc.save()
}
catch
{
print("Failed to save item")
return
}
}
}