这是我的代码：
import UIKit
import CoreData
class PhotoList: UIViewController, UITableViewDelegate, UITableViewDataSource, NSFetchedResultsControllerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
fetchedResultsController = NSFetchedResultsController(fetchRequest: fetchRequest(), managedObjectContext: moc!, sectionNameKeyPath: nil, cacheName: nil)
fetchedResultsController?.delegate = self
fetchedResultsController?.performFetch(nil)
tableView.reloadData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
@IBOutlet var tableView: UITableView!
var whoTookArray: [String] = []
var imageArray: [UIImage] = []
let moc:NSManagedObjectContext? = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
var fetchedResultsController: NSFetchedResultsController?
var whoTookName: String = ""
func fetchRequest() -> NSFetchRequest {
var request = NSFetchRequest(entityName:"PhotoListEntity")
let sortDescriptor = NSSortDescriptor(key: "whoTook", ascending: true)
request.predicate = nil
request.sortDescriptors = [sortDescriptor]
request.fetchBatchSize = 20
return request
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return fetchedResultsController?.sections?[section].numberOfObjects ?? 0
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! UITableViewCell
if let let whoTookName = fetchedResultsController?.objectAtIndexPath(indexPath) as? PhotoListEntity {
cell.textLabel?.text = whoTookName.whoTook
}
return cell
}
//NSFetchedResultsController Delegate functions
func controller(controller: NSFetchedResultsController, didChangeSection sectionInfo: NSFetchedResultsSectionInfo, atIndex sectionIndex: Int, forChangeType type:NSFetchedResultsChangeType) {
switch type {
case NSFetchedResultsChangeType.Insert:
tableView.insertSections(NSIndexSet(index: sectionIndex), withRowAnimation: UITableViewRowAnimation.Fade)
break
case NSFetchedResultsChangeType.Delete:
tableView.deleteSections(NSIndexSet(index: sectionIndex), withRowAnimation: UITableViewRowAnimation.Fade)
break
case NSFetchedResultsChangeType.Move:
break
case NSFetchedResultsChangeType.Update:
break
default:
break
}
}
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == .Delete {
}
switch editingStyle {
case .Delete:
moc?.deleteObject(fetchedResultsController?.objectAtIndexPath(indexPath) as! PhotoListEntity)
case .Insert:
break
case .None:
break
}
}
func controller(controller: NSFetchedResultsController, didChangeObject anObject: AnyObject, atIndexPath indexPath: NSIndexPath?, forChangeType type: NSFetchedResultsChangeType, newIndexPath: NSIndexPath?) {
switch type {
case NSFetchedResultsChangeType.Insert:
tableView.insertRowsAtIndexPaths(NSArray(object: newIndexPath!) as [AnyObject], withRowAnimation: UITableViewRowAnimation.Fade)
break
case NSFetchedResultsChangeType.Delete:
tableView.deleteRowsAtIndexPaths(NSArray(object: newIndexPath!) as [AnyObject], withRowAnimation: .Fade)
break
case NSFetchedResultsChangeType.Move:
tableView.deleteRowsAtIndexPaths(NSArray(object: newIndexPath!) as [AnyObject], withRowAnimation: .Fade)
break
case NSFetchedResultsChangeType.Update:
tableView.cellForRowAtIndexPath(indexPath!)
break
default:
break
}
}
func controllerWillChangeContent(controller: NSFetchedResultsController) {
tableView.beginUpdates()
}
func controllerDidChangeContent(controller: NSFetchedResultsController) {
tableView.endUpdates()
}
}
和
import UIKit
import CoreData
protocol sendDetailsDelegate {
func sendDetails(name: String)
}
class Details: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UITableViewDelegate, NSFetchedResultsControllerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
let tapGestureRecognizer: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "chooseImage:")
tapGestureRecognizer.numberOfTapsRequired = 1
imageSelected.addGestureRecognizer(tapGestureRecognizer)
imageSelected.userInteractionEnabled = true
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBOutlet var whoTookTextField: UITextField!
@IBOutlet var imageSelected: UIImageView!
let moc: NSManagedObjectContext = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext!
//Pick the image by tapping, accessing the PhotoLibrary
func chooseImage(recognizer: UITapGestureRecognizer) {
let imagePicker: UIImagePickerController = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
self.presentViewController(imagePicker, animated: true, completion: nil)
}
//Put the selected image into the screen
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
let pickedImage: UIImage = (info as NSDictionary).objectForKey(UIImagePickerControllerOriginalImage) as! UIImage
let smallPicture = scaleImageWith(pickedImage, newSize: CGSizeMake(288,148))
var sizeOfImageView: CGRect = imageSelected.frame
sizeOfImageView.size = smallPicture.size
imageSelected.frame = sizeOfImageView
imageSelected.image = smallPicture
picker.dismissViewControllerAnimated(true, completion: nil)
}
func imagePickerControllerDidCancel(picker: UIImagePickerController) {
picker.dismissViewControllerAnimated(true, completion: nil)
}
func scaleImageWith(image: UIImage, newSize: CGSize) -> UIImage {
UIGraphicsBeginImageContextWithOptions(newSize, false, 0.0)
image.drawInRect(CGRectMake(0,0, newSize.width, newSize.height))
let newImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage
}
@IBAction func addButton(sender: AnyObject) {
if whoTookTextField == nil || imageSelected == nil { return }
if imageSelected == nil { return }
let entityDescription = NSEntityDescription.entityForName("PhotoListEntity", inManagedObjectContext: moc)
let name = NSManagedObject(entity: entityDescription!, insertIntoManagedObjectContext: moc)
name.setValue(whoTookTextField.text, forKey: "whoTook")
if let navigation = self.navigationController {
navigation.popViewControllerAnimated(true)
}
}
}
and this is my CoreData model:
import Foundation
import CoreData
@objc(PhotoListEntity)
class PhotoListEntity: NSManagedObject {
@NSManaged var whoTook: String
@NSManaged var relationship: PhotoListEntity
}
我对此并不陌生，对此我感到抱歉。我想知道为什么当我再次关闭并打开该应用程序时为什么不保存它。谢谢！！！！
答案已经发布！谢谢大家的想法！ ：D
最佳答案
添加此功能：
func save() {
var appDel: AppDelegate = (UIApplication.sharedApplication().delegate as! AppDelegate)
var moc: NSManagedObjectContext = appDel.managedObjectContext!
var whoTook: AnyObject! = NSEntityDescription.insertNewObjectForEntityForName("PhotoListEntity", inManagedObjectContext: moc)
var error: NSError?
moc.save(nil)
}
并在addButton中调用它！做完了！ ：D