Unable to save images in Core Data - image

Question

I am creating a student index app, in which you can save names, pictures and roles of students. Everything works just fine, but my code does not save images in my Core Data Model. I have been trying to figure it out the whole day.
You can find my whole project here: http://www21.zippyshare.com/v/26184330/file.html
#import "AddStudent.h"
#import "Studenten.h"
#import "Bild.h"
#import <QuartzCore/QuartzCore.h>
#interface AddStudent () <UIImagePickerControllerDelegate, UINavigationControllerDelegate>
#end
#implementation AddStudent;
#synthesize delegate;
#synthesize managedObjectContext = _managedObjectContext;
#synthesize selectedBetreuungsgrund;
#synthesize studentBetrGrundCell = _studentBetrGrundCell;
#synthesize vorschauImageView = _vorschauImageView;
- (void)viewWillAppear:(BOOL)animated {
_studentBetrGrundCell.textLabel.text = #"";
_studentBetrGrundCell.delegate = self;
_studentBetrGrundCell.managedObjectContext = self.managedObjectContext;
}
- (void)betrGrundWasSelectedOnPicker:(Betreuungsgrund *)betreuungsgrund {
self.selectedBetreuungsgrund = betreuungsgrund;
_studentBetrGrundCell.textLabel.text = self.selectedBetreuungsgrund.name;
}
- (void)viewDidUnload
{
[super viewDidUnload];
}
- (void)dismissKeyboard {
[self.view endEditing:TRUE];
}
- (void)viewDidLoad {
[super viewDidLoad];
self.studentNachnameTextfeld.delegate = self;
self.studentVornameTextFeld.delegate = self;
_studentNachnameTextfeld.autocapitalizationType = UITextAutocapitalizationTypeSentences;
_studentVornameTextFeld.autocapitalizationType = UITextAutocapitalizationTypeSentences;
UITapGestureRecognizer *tgr = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(dismissKeyboard)];
[tgr setCancelsTouchesInView:NO];
[self.tableView addGestureRecognizer:tgr];
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[textField resignFirstResponder];
return YES;
}
- (IBAction)save:(id)sender
{
if (([_studentNachnameTextfeld.text isEqualToString:(#"")])||([_studentVornameTextFeld.text isEqualToString:(#"")])){
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:nil message:#"Sie müssen alle Namensfelder ausfüllen!" delegate:self cancelButtonTitle:#"Ok" otherButtonTitles: nil];
[alert show];
}
else {
Student *student = [NSEntityDescription insertNewObjectForEntityForName:#"Student"
inManagedObjectContext:self.managedObjectContext];
student.vorname = _studentVornameTextFeld.text;
student.name = _studentNachnameTextfeld.text;
student.hatBetrGrund = selectedBetreuungsgrund; //Funzt trotzdem
student.bild.vorschauData = _vorschauImageView.image;
NSLog(#"Image Core Data: %#", _vorschauImageView.image);
NSLog(#"Image Core Data DB: %#", student.bild.vorschauData);
// NSLog(#"Betreuungsgrund: %#", student.hatBetrGrund);
[self.managedObjectContext save:nil]; // Eintrag in Datenbank
[self.delegate AddStudentSavePressed:self];
NSLog (#"Save Button bei AddBetrGrund pressed");
}
}
- (IBAction)albumButtonPressed:(id)sender
{
if (! [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary] ) {
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:#"Error" message:#"Es steht kein Album zur Verfügung!" delegate:self cancelButtonTitle:#"Ok" otherButtonTitles: nil];
[alert show];
return;
}
UIImagePickerController *controller = [[UIImagePickerController alloc] init];
controller.delegate = self;
controller.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentViewController:controller animated:YES completion:nil];
}
- (IBAction)kameraButtonPressed:(id)sender
{
if (! [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera] ) {
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:#"Error" message:#"Es steht keine Kamera zur Verfügung!" delegate:self cancelButtonTitle:#"Ok" otherButtonTitles: nil];
[alert show];
return;
}
UIImagePickerController *controller = [[UIImagePickerController alloc] init];
controller.delegate = self;
controller.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentViewController:controller animated:YES completion:nil];
}
- (IBAction)deleteBildPressed:(id)sender {
self.vorschauImageView.image = nil;
}
- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo
{
[picker dismissViewControllerAnimated:YES completion:nil];
_vorschauImageView.image = image;
_vorschauImageView.layer.cornerRadius = 10; // abgerundete Ecken
NSLog(#"Image Vorschau: %#", _vorschauImageView.image);
}
Thanks in advance for ur help. Cheers

Answer 1

Generally you shouldn't save the image in Core Data. Instead, save it in a file on disk and save the path to the file in Core Data model.
This line:
student.bild.vorschauData = _vorschauImageView.image;
makes it look like the student has a relationship (bild) to some other object which contains the image. You need to create that object, insert it into the context and associated it with the student before you can use it.