i have a custom table view cell. With two labels.
The Label on the right loads its text from an entity. (See picture Below)
-(void)viewWillAppear:(BOOL)animated{
if (self.context == nil)
{
self.context = [(RootAppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext];
}
NSFetchRequest *request = [[NSFetchRequest alloc]init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"Entity" inManagedObjectContext:self.context];
[request setEntity:entity];
NSError *error;
NSMutableArray *array = [[self.context executeFetchRequest:request error:&error] mutableCopy];
[self setTableArray:array];
[self.myTableView reloadData];
[super viewWillAppear:YES];
}
And i set the text accordingly as per documentation.
My problem lies when i try to load the second labels text from a different entity, So simply, i tried this:
-(void)viewWillAppear:(BOOL)animated{
if (self.context == nil)
{
self.context = [(RootAppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext];
}
NSFetchRequest *request = [[NSFetchRequest alloc]init];
NSFetchRequest *sRequest = [[NSFetchRequest alloc]init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"Entity" inManagedObjectContext:self.context];
NSEntityDescription *sEntity = [NSEntityDescription entityForName:#"Entity2" inManagedObjectContext:self.context];
[request setEntity:entity];
[sRequest setEntity:sEntity];
NSError *error;
NSError *sError;
NSMutableArray *array = [[self.context executeFetchRequest:request error:&error] mutableCopy];
NSMutableArray *sArray = [[self.context executeFetchRequest:sRequest error:&sError]mutableCopy];
[self setTableArray:array];
[self setSecondTableArray:sArray];
[self.ammoTable reloadData];
[super viewWillAppear:YES];
}
And i set the table View's cell's text via:
-(UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString * identifier = #"identifier";
self.cell = [tableView dequeueReusableCellWithIdentifier:identifier];
Entity2 *entity2 = [self.secondTableArray objectAtIndex:indexPath.row];
Entity *entity = [self.tableArray objectAtIndex:indexPath.row];
self.cell.rightLabel.text = [[entity.brand stringByAppendingString:#" "] stringByAppendingString:entity.model];
self.cell.leftLabel.text = entity2.numberOfRounds;
return self.cell;
}
and i get this error, when i push this view:
*** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array'
and i get a SIGABRT error on this line:
Entity2 *entity2 = [self.secondTableArray objectAtIndex:indexPath.row];
Any help would be greatly appreciated, Thank you!
Instead of trying to load 2 different entities, i just added another attribute to the original entity, and i imported/used the newly created attribute in the entity to populate the right label!
Related
I need to update the value of the desired cell in my core data. I have a cell (ID) with a known value to me. I need to find the value and replace. I know how to change the elements of the array. The following shows how I do it. But I have to change the field (ID) in MyBase. value that I need to change will be equal to fromIndexPath.row. The value on which I need to change toIndexPath.row.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath
*)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
if (fromIndexPath.section == toIndexPath.section) {
NSFetchRequest* fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription* entityDescription = [NSEntityDescription entityForName:#"MyBase"
inManagedObjectContext:self.objectContext];
[fetchRequest setEntity:entityDescription];
empArray = [(NSArray*)[self.objectContext executeFetchRequest:fetchRequest error:nil] mutableCopy];
MyBase *employee = [empArray objectAtIndex:fromIndexPath.row];
[empArray removeObjectAtIndex:fromIndexPath.row];
[empArray insertObject:objectToMove atIndex:toIndexPath.row];
}
}
for update core data, you can try this:
NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#:#"Employee"
inManagedObjectContext:self.managedObjectContext];
[request setEntity:entity];
NSPredicate *pred = [NSPredicate predicateWithFormat:[NSString stringWithFormat:#"empId = %d", 12345]];
[request setPredicate:pred];
NSArray *empArray=[self.managedObjectContext executeFetchRequest:request error:nil];
[request release];
if ([empArray count] > 0){
Employee *employee = [empArray objectAtIndex:fromIndexPath.row];;
employee.empSalary=[NSNumber numberWithInt:45000];
employee.empName=#"John";
employee.empDesignation=#"Analysist";
employee.empExp=#"4 Years";
[self.managedObjectContext save:nil];
I have a table view with 40 objects. I have to filter them by gender when Click in a UISegment (male, female and both). It seems to be working, but table view does not refresh. Please any help would be appreciatte.
-(void)viewDidLoad
{
[super viewDidLoad];
self.navigationItem.title = #"People";
[self loadall];
[[NSBundle mainBundle] loadNibNamed:#"FilterSortView" owner:self options:nil];
self.filterControl.selectedSegmentIndex = -1;
[self.filterControl addTarget:self action:#selector( changeSegge ) forControlEvents:UIControlEventValueChanged];
}
#
My second method to filter by gender
- (void)changeSegge
{
NSEntityDescription *personEntity = [NSEntityDescription entityForName:#"Person"
inManagedObjectContext:self.managedObjectContext];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
[request setEntity:personEntity];
NSError *error = nil;
self.people = [self.managedObjectContext executeFetchRequest:request error:&error];
if (error)
{
[NSException raise:NSInternalInconsistencyException format:#"Could not fetch Core Data records: %#",error];
}
if(filterControl.selectedSegmentIndex == 0){
NSPredicate *predicatem =[NSPredicate predicateWithFormat:#"gender == %#", #"m" ];
request.predicate=predicatem;
[self.tableView reloadData];
[request release];
NSLog(#"button 1");
}
Thanks a lot.
You forgot to fill people array after predicate set to fetch request.
Here is updated changeSegge method:
- (void)changeSegge
{
NSEntityDescription *personEntity = [NSEntityDescription entityForName:#"Person"
inManagedObjectContext:self.managedObjectContext];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
[request setEntity:personEntity];
NSError *error = nil;
self.people = [self.managedObjectContext executeFetchRequest:request error:&error];
if (error)
{
[NSException raise:NSInternalInconsistencyException format:#"Could not fetch Core Data >records: %#",error];
}
if(filterControl.selectedSegmentIndex == 0){
NSPredicate *predicatem =[NSPredicate predicateWithFormat:#"gender == %#", #"m" ];
request.predicate=predicatem;
self.people = [self.managedObjectContext executeFetchRequest:request error:&error];
[self.tableView reloadData];
[request release];
NSLog(#"button 1");
}
I have a NSFetchRequest to search of core data entities. It finds them fine, but I want to set the cell's text to the entity's name attribute.
I currently have this but I am setting the object itself to the title, instead of the name attribute, how can I fix this?
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"Routine" inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];
NSError *error = nil;
NSArray *results = [managedObjectContext executeFetchRequest:fetchRequest error:&error];
self.routineArray = results;
[fetchRequest release];
cell.textLabel.text = [self.routineArray objectAtIndex:indexPath.row];
Try :
cell.textLabel.text = [[self.routineArray objectAtIndex:indexPath.row] name];
EDIT
If your Routine instances are in routineArray (given that name, I suppose) :
// get the Routine instance
Routine *r = [self.routineArray objectAtIndex:indexPath.row];
// now you got your instance, set anything you want on r...
// ...
// and then set its name as the text for textLabel using previous instruction
I am working with coredata and successfully saved the data in data storage but when I try to output what I stored using table view ,I am not able to do it.
Here the user will enter and click save ..so when he goes back..I want the table to populated with what name he or she has entered.
So I wrote the below code for saving and find data:
- (void) saveData
{
coredata123AppDelegate *appDelegate =
[[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context =
[appDelegate managedObjectContext];
Contacts *newContact;
newContact = [NSEntityDescription
insertNewObjectForEntityForName:#"Contacts"
inManagedObjectContext:context];
[newContact setValue:name.text forKey:#"name"];
[newContact setValue:address.text forKey:#"address"];
[newContact setValue:phone.text forKey:#"phone"];
name.text = #"";
address.text = #"";
phone.text = #"";
NSError *error;
[context save:&error];
status.text = #"Contact saved";
}
- (void) findContact
{
coredata123AppDelegate *appDelegate =
[[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context =
[appDelegate managedObjectContext];
NSEntityDescription *entityDesc =
[NSEntityDescription entityForName:#"Contacts"
inManagedObjectContext:context];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
[request setEntity:entityDesc];
NSPredicate *pred =
[NSPredicate predicateWithFormat:#"(name = %#)",
name.text];
[request setPredicate:pred];
NSManagedObject *matches = nil;
NSError *error;
NSArray *objects = [context executeFetchRequest:request
error:&error];
for(Contacts *info in objects)
{
NSLog(#"Name:%#",info.name);
NSLog(#"Address:%#",info.address);
}
if ([objects count] == 0) {
status.text = #"No matches";
} else {
matches = [objects objectAtIndex:0];
address.text = [matches valueForKey:#"address"];
phone.text = [matches valueForKey:#"phone"];
status.text = [NSString stringWithFormat:
#"%d matches found", [objects count]];
}
[request release];
}
And to populate the table view i have written this code..
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription
entityForName:#"Contacts" inManagedObjectContext:context];
[fetchRequest setEntity:entity];
NSError *error;
self.contacts = [context executeFetchRequest:fetchRequest error:&error];
[fetchRequest release];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
Contacts *info =[contacts objectAtIndex:indexPath.row];
cell.textLabel.text =info.name;
cell.detailTextLabel.text=info.address;
// Configure the cell...
return cell;
}
Are you getting proper number of elements in this objects array?
NSArray *objects = [context executeFetchRequest:request
error:&error];
if not, try changing the predicate with,
[NSPredicate predicateWithFormat:#"name=%#", name.text];
Otherwise, your code seems correct to me.
I'm using Core Data and I need to loop thru the result of the request, create several custom objects in the loop and store them in a NSMUtableArray, so I can send it to another view to feed a UI component. This is what I'm doing:
NSMutableArray *persons = [[NSMutableArray alloc] init];
NSError *error = nil;
NSManagedObjectContext *context = [self managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription
entityForName:#"Person" inManagedObjectContext:context];
[fetchRequest setEntity:entity];
NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
for (NSManagedObject *info in fetchedObjects) {
ToggleButtonInfo *btn = [[ToggleButtonInfo alloc] init];
NSString *personName = [NSString stringWithFormat:#"ww %#", [info valueForKey:#"name"]];
NSLog(#"pn: %#", personName);
[btn setButtonInfo:personName];
[persons addObject:btn];
}
[fetchRequest release];
return persons;
The loop is working just fine, the information is there. The problem is that I get a "EXC_BAD_ACCESS" in my component if I use:
[info valueForKey:#"name"]
if I do something like this:
[btn setButtonInfo:#"something else here"];
everything works fine. So it looks like info is been de-allocated and that is causing the error, right? I try creating the scring using stringWithFormat but it doesn't work, same error.
An ideas?
Where do you get the EXC_BAD_ACCESS? I assume it's later when you're displaying the button? -setButtonInfo: probably isn't retaining, or you're over-releasing somewhere else.
Note that you're leaking btn in this code.