快速学习这一切的新手。我创建了一个带有核心数据集成的简单任务应用程序，它非常适用。
我想为每个任务添加一个图像，所以我将图像作为二进制数据添加到我的核心数据模型中，添加了一个轻量级的迁移，以及一些添加图像的代码（相机或库）。当我启动应用程序时，我可以添加条目到我的应用程序，一切正常。但是，当我重新启动我的应用程序时，应用程序崩溃并出现错误（lldb）。当我键入bt时，我收到此错误消息：
* thread #1: tid = 0xba2d3, 0x000000010140a43c CoreFoundation`CFStringCreateCopy + 28, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
frame #0: 0x000000010140a43c CoreFoundation`CFStringCreateCopy + 28
frame #1: 0x000000010338f70d libswiftCore.dylib`function signature specialization <Arg[0] = Owned To Guaranteed, Arg[1] = Dead> of Swift.String.init (Swift.String.Type)(_cocoaString : Swift.AnyObject) -> Swift.String + 93
frame #2: 0x00000001033701a3 libswiftCore.dylib`Swift.String.init (Swift.String.Type)(_cocoaString : Swift.AnyObject) -> Swift.String + 19
* frame #3: 0x0000000100dab7d0 TaskIt`TaskIt.ViewController.tableView (tableView=0x00007fe9f3059400, indexPath=0xc000000000000016, self=0x00007fe9f2640110)(ObjectiveC.UITableView, cellForRowAtIndexPath : ObjectiveC.NSIndexPath) -> ObjectiveC.UITableViewCell + 640 at ViewController.swift:80
frame #4: 0x0000000100dabcdf TaskIt`@objc TaskIt.ViewController.tableView (TaskIt.ViewController)(ObjectiveC.UITableView, cellForRowAtIndexPath : ObjectiveC.NSIndexPath) -> ObjectiveC.UITableViewCell + 79 at ViewController.swift:0
frame #5: 0x0000000101ed6a28 UIKit`-[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 508
frame #6: 0x0000000101eb5248 UIKit`-[UITableView _updateVisibleCellsNow:isRecursive:] + 2853
frame #7: 0x0000000101ecb8a9 UIKit`-[UITableView layoutSubviews] + 210
frame #8: 0x0000000101e55a2b UIKit`-[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 536
frame #9: 0x0000000105b21ec2 QuartzCore`-[CALayer layoutSublayers] + 146
frame #10: 0x0000000105b166d6 QuartzCore`CA::Layer::layout_if_needed(CA::Transaction*) + 380
frame #11: 0x0000000101e49675 UIKit`-[UIView(Hierarchy) layoutBelowIfNeeded] + 607
frame #12: 0x0000000101f3645e UIKit`-[UINavigationController _layoutViewController:] + 1135
frame #13: 0x0000000101f334a8 UIKit`-[UINavigationController navigationTransitionView:didEndTransition:fromView:toView:] + 522
frame #14: 0x0000000101e35136 UIKit`-[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 209
frame #15: 0x0000000101e33470 UIKit`+[UIViewAnimationState popAnimationState] + 289
frame #16: 0x000000010213a076 UIKit`-[UINavigationTransitionView transition:fromView:toView:] + 2569
frame #17: 0x0000000101f371b0 UIKit`-[UINavigationController _startTransition:fromViewController:toViewController:] + 2984
frame #18: 0x0000000101f37448 UIKit`-[UINavigationController _startDeferredTransitionIfNeeded:] + 523
frame #19: 0x0000000101f37f0e UIKit`-[UINavigationController __viewWillLayoutSubviews] + 43
frame #20: 0x0000000102082715 UIKit`-[UILayoutContainerView layoutSubviews] + 202
frame #21: 0x0000000101e55a2b UIKit`-[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 536
frame #22: 0x0000000105b21ec2 QuartzCore`-[CALayer layoutSublayers] + 146
frame #23: 0x0000000105b166d6 QuartzCore`CA::Layer::layout_if_needed(CA::Transaction*) + 380
frame #24: 0x0000000105b16546 QuartzCore`CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 24
frame #25: 0x0000000105a82886 QuartzCore`CA::Context::commit_transaction(CA::Transaction*) + 242
frame #26: 0x0000000105a83a3a QuartzCore`CA::Transaction::commit() + 462
frame #27: 0x0000000101dd3a2d UIKit`-[UIApplication _reportMainSceneUpdateFinished:] + 44
frame #28: 0x0000000101dd46f1 UIKit`-[UIApplication _runWithMainScene:transitionContext:completion:] + 2648
frame #29: 0x0000000101dd30d5 UIKit`-[UIApplication workspaceDidEndTransaction:] + 179
frame #30: 0x0000000104a8f5e5 FrontBoardServices`__31-[FBSSerialQueue performAsync:]_block_invoke_2 + 21
frame #31: 0x000000010146841c CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
frame #32: 0x000000010145e165 CoreFoundation`__CFRunLoopDoBlocks + 341
frame #33: 0x000000010145df25 CoreFoundation`__CFRunLoopRun + 2389
frame #34: 0x000000010145d366 CoreFoundation`CFRunLoopRunSpecific + 470
frame #35: 0x0000000101dd2b42 UIKit`-[UIApplication _run] + 413
frame #36: 0x0000000101dd5900 UIKit`UIApplicationMain + 1282
frame #37: 0x0000000100db40a7 TaskIt`main + 135 at AppDelegate.swift:13
frame #38: 0x000000010445f145 libdyld.dylib`start + 1
我的代码：
@IBAction func addPhotoButtonTapped(sender: AnyObject) {
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera) {
var cameraController = UIImagePickerController()
cameraController.delegate = self
cameraController.sourceType = UIImagePickerControllerSourceType.Camera
let mediaTypes:[AnyObject] = [kUTTypeImage]
cameraController.mediaTypes = mediaTypes
cameraController.allowsEditing = false
self.presentViewController(cameraController, animated: true, completion: nil)
}
else if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.PhotoLibrary) {
var photoLibraryController = UIImagePickerController()
photoLibraryController.delegate = self
photoLibraryController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
let mediaTypes:[AnyObject] = [kUTTypeImage]
photoLibraryController.mediaTypes = mediaTypes
photoLibraryController.allowsEditing = false
self.presentViewController(photoLibraryController, animated: true, completion: nil)
}
else {
var alertController = UIAlertController(title: "Alert", message: "Your device does not support the camera or photo Library", preferredStyle: UIAlertControllerStyle.Alert)
alertController.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alertController, animated: true, completion: nil)
}
}
//UIImagePickerControllerDelegate
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
let image = info[UIImagePickerControllerOriginalImage] as! UIImage
let imageData = UIImageJPEGRepresentation(image, 1.0)
let managedObjectContext = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
let entityDescription = NSEntityDescription.entityForName("TaskModel", inManagedObjectContext: managedObjectContext!)
let feedItem = TaskModel(entity: entityDescription!, insertIntoManagedObjectContext: managedObjectContext!)
bgImage = UIImageView(image: image)
bgImage.frame = CGRectMake(0,0,100,200)
self.view.addSubview(bgImage)
(UIApplication.sharedApplication().delegate as! AppDelegate).saveContext()
self.dismissViewControllerAnimated(true, completion: nil)
}
@IBAction func addTaskButtonTapped(sender: UIButton) {
let appDelegate = (UIApplication.sharedApplication().delegate as! AppDelegate)
let managedObjectContext = appDelegate.managedObjectContext
let entityDescription = NSEntityDescription.entityForName("TaskModel", inManagedObjectContext: managedObjectContext!)
let task = TaskModel(entity: entityDescription!, insertIntoManagedObjectContext: managedObjectContext!)
task.task = taskTextField.text
task.subtask = subtaskTextField.text
task.date = dueDatePicker.date
task.completed = false
let imageNSData = UIImageJPEGRepresentation(bgImage.image, 1.0);
task.image = imageNSData;
appDelegate.saveContext()
var request = NSFetchRequest(entityName: "TaskModel")
var error:NSError? = nil
var results:NSArray = managedObjectContext!.executeFetchRequest(request, error: &error)!
for res in results {
println(res)
}
self.dismissViewControllerAnimated(true, completion: nil)
}
的ViewController
import UIKit
import CoreData
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, NSFetchedResultsControllerDelegate {
@IBOutlet weak var tableView: UITableView!
let managedObjectContext = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext!
var fetchedResultsController:NSFetchedResultsController = NSFetchedResultsController()
var imageViewRow:UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
fetchedResultsController = getFetchedResultsController()
fetchedResultsController.delegate = self
fetchedResultsController.performFetch(nil)
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "showDetailTask" {
let detailVC: DetailViewController = segue.destinationViewController as! DetailViewController
let indexPath = self.tableView.indexPathForSelectedRow()
let thisTask = fetchedResultsController.objectAtIndexPath(indexPath!) as! TaskModel
detailVC.detailTaskModel = thisTask
}
else if segue.identifier == "showTaskAdd" {
let addTaskVC:AddTaskViewController = segue.destinationViewController as! AddTaskViewController
}
}
@IBAction func addButtonTapped(sender: UIBarButtonItem) {
self.performSegueWithIdentifier("showTaskAdd", sender: self)
}
//UITableViewDataSource
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return fetchedResultsController.sections!.count
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return fetchedResultsController.sections![section].numberOfObjects
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let thisTask = fetchedResultsController.objectAtIndexPath(indexPath) as! TaskModel
//println(thisTask)
var cell: TaskCell = tableView.dequeueReusableCellWithIdentifier("myCell") as! TaskCell
cell.taskLabel.text = thisTask.task
cell.descriptionLabel.text = thisTask.subtask
cell.dateLabel.text = Date.toString(date: thisTask.date)
return cell
}
//UITableViewDelegate
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
println(indexPath.row)
performSegueWithIdentifier("showDetailTask", sender: self)
}
func tableView(tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
return 25
}
func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
if section == 0 {
return "To do"
}
else {
return "Completed"
}
}
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
let thisTask = fetchedResultsController.objectAtIndexPath(indexPath) as! TaskModel
if indexPath.section == 0 {
thisTask.completed = true
}
else {
thisTask.completed = false
}
(UIApplication.sharedApplication().delegate as! AppDelegate).saveContext()
}
// NSFetchedResultsControllerDelegate
func controllerDidChangeContent(controller: NSFetchedResultsController) {
tableView.reloadData()
}
//Helper
func taskFetchRequest() -> NSFetchRequest {
let fetchRequest = NSFetchRequest(entityName: "TaskModel")
let sortDescriptor = NSSortDescriptor(key: "date", ascending: true)
let completedDescriptor = NSSortDescriptor(key: "completed", ascending: true)
fetchRequest.sortDescriptors = [completedDescriptor, sortDescriptor]
return fetchRequest
}
func getFetchedResultsController() -> NSFetchedResultsController {
fetchedResultsController = NSFetchedResultsController(fetchRequest: taskFetchRequest(), managedObjectContext: managedObjectContext, sectionNameKeyPath: "completed", cacheName: nil)
return fetchedResultsController
}
}
希望有人能把我带到正确的方向。
谢谢！