Load CoreData objects' string property into UIPickerView

Question

Hello

Currently I have an entity named "Events" in a CoreData app. "Events" has one string property named "eventName".

In the -(void)viewDidLoad I am trying to Fetch all the "Events" objects and load their "eventName" by alphabetical order into a UIPickerView.

The ultimate end goal is through the use of a textField, buttons and the pickerView being add new objects in and remove unwanted objects out. Basically turning the UIPickerView into a UITableView. Currently I am able to save objects to the CoreData store, but am not able to pull them/their properties out into the UIPickerView.

I am willing and able to share the project source code to anyone who wants it, or is willing to look at it to help out.

thanks Chris

Answer 1

-(void)update {
NSMutableArray *array2 = [[NSMutableArray alloc] init];

CDPickerAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
NSManagedObjectContext *moc = [appDelegate managedObjectContext];
NSEntityDescription *entityDescription = [NSEntityDescription entityForName:@"Event" inManagedObjectContext:moc];
NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];
[request setEntity:entityDescription];

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"callName" ascending:YES];
[request setSortDescriptors:[NSArray arrayWithObject:sortDescriptor]];
[sortDescriptor release];

NSArray *array = [moc executeFetchRequest:request error:&error];

for (int i=0; i<array.count; i++) {     
    Event *theEvent = [array objectAtIndex:i];

    NSString *StringOne = [NSString stringWithFormat:@"%@",theEvent.callName];

    [array2 addObject:StringOne];

}

self.pickerData = array2;   
[singlePicker reloadAllComponents];

}

-(IBAction)addCall{ CDPickerAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate]; NSManagedObjectContext *context = [appDelegate managedObjectContext];
NSManagedObject *theEvent = [NSEntityDescription insertNewObjectForEntityForName:@"Event" inManagedObjectContext:context];

[theEvent setValue:callField.text forKey:@"callName"];

[context save:&error];

callField.text=@"";

[callField resignFirstResponder];
self.update; }