Question

Hi i am almost new in programing.
I am faced with an error that I couldn’t solve anyway. Even after comparing with anther solutions.
I have worked on it for about 3 days.

So let me completely describe my problem:

1.this is my implementation code:

#import "DocumentTableViewController.h"
#import "AddDocumentTableView.h"
#import "DB_document.h"

@implementation DocumentTableViewController

@synthesize managedObjectContext;
@synthesize btnAddDocument;
@synthesize fetchedObjects;

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    NSManagedObjectContext *context = managedObjectContext;
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"DB_document" inManagedObjectContext:context];
    [fetchRequest setEntity:entity];
    NSError *error;
    fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
    NSLog(@"%d",[fetchedObjects count]);
}

- (void)viewDidUnload
{
    [self setBtnAddDocument:nil];
    [super viewDidUnload];
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 2;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    int result = 0;
    if (section == 0) 
    {
        result = [fetchedObjects count] + 1;
    }
    else if (section == 1)
    {
        result = 1;
    }
    return result;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 40;
}

- (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];
    }

    DB_document *db_document = [fetchedObjects objectAtIndex:indexPath.row];

    if (indexPath.section == 0 && indexPath.row == 0) 
    {
        UILabel *lblMoney = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, 70, 40)];
        lblMoney.text = @"amount";
        lblMoney.textAlignment = UITextAlignmentCenter;
        lblMoney.textColor = [UIColor blackColor];
        lblMoney.backgroundColor = [UIColor clearColor];
        lblMoney.font = [UIFont systemFontOfSize:12];
        [cell addSubview:lblMoney];

        UILabel *lblDescription = [[UILabel alloc] initWithFrame:CGRectMake(85, 0, 150, 40)];
        lblDescription.text = @"description";
        lblDescription.textAlignment = UITextAlignmentCenter;
        lblDescription.textColor = [UIColor blackColor];
        lblDescription.backgroundColor = [UIColor clearColor];
        lblDescription.font = [UIFont systemFontOfSize:12];
        [cell addSubview:lblDescription];

        UILabel *lblDate = [[UILabel alloc] initWithFrame:CGRectMake(240, 0, 70, 40)];
        lblDate.text = @"date";
        lblDate.textAlignment = UITextAlignmentCenter;
        lblDate.textColor = [UIColor blackColor];
        lblDate.backgroundColor = [UIColor clearColor];
        lblDate.font = [UIFont systemFontOfSize:12];
        [cell addSubview:lblDate];

        UIButton *btnLine1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        btnLine1.frame = CGRectMake(80, 0, 1, 40);
        [cell addSubview:btnLine1];

        UIButton *btnLine2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        btnLine2.frame = CGRectMake(240, 0, 1, 40);
        [cell addSubview:btnLine2];

        return cell;
    }
    if (indexPath.section == 0 && indexPath.row != 0)
    {
        UILabel *lblMoney = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, 70, 40)];
        lblMoney.text = [NSString stringWithFormat:@"%d",db_document.docAmount];
        lblMoney.textAlignment = UITextAlignmentCenter;
        lblMoney.textColor = [UIColor blackColor];
        lblMoney.backgroundColor = [UIColor clearColor];
        lblMoney.font = [UIFont systemFontOfSize:12];
        [cell addSubview:lblMoney];

        UILabel *lblDescription = [[UILabel alloc] initWithFrame:CGRectMake(85, 0, 150, 40)];
        lblDescription.text = db_document.docDescription;
        lblDescription.numberOfLines = 2;
        lblDescription.textAlignment = UITextAlignmentCenter;
        lblDescription.textColor = [UIColor blackColor];
        lblDescription.backgroundColor = [UIColor clearColor];
        lblDescription.font = [UIFont systemFontOfSize:12];
        [cell addSubview:lblDescription];

        UILabel *lblDate = [[UILabel alloc] initWithFrame:CGRectMake(240, 0, 70, 40)];
        NSDateFormatter *dateFormater = [[NSDateFormatter alloc] init];
        [dateFormater setDateFormat:@"yyyy/mm/dd"];
        lblDate.text = [NSString stringWithFormat:@"%@",[dateFormater stringFromDate:(NSDate *)db_document.docDate]];
        lblDate.textAlignment = UITextAlignmentCenter;
        lblDate.textColor = [UIColor blackColor];
        lblDate.backgroundColor = [UIColor clearColor];
        lblDate.font = [UIFont systemFontOfSize:12];
        [cell addSubview:lblDate];

        UIButton *btnLine1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        btnLine1.frame = CGRectMake(80, 0, 1, 40);
        [cell addSubview:btnLine1];

        UIButton *btnLine2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        btnLine2.frame = CGRectMake(240, 0, 1, 40);
        [cell addSubview:btnLine2];

        return cell;
    }
    if (indexPath.section == 1)
    {
        UILabel *lblMoney = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, 70, 40)];
        lblMoney.text = @"";
        lblMoney.textAlignment = UITextAlignmentCenter;
        lblMoney.textColor = [UIColor blackColor];
        lblMoney.backgroundColor = [UIColor clearColor];
        lblMoney.font = [UIFont systemFontOfSize:12];
        [cell addSubview:lblMoney];

        UILabel *lblTotalAmount = [[UILabel alloc] initWithFrame:CGRectMake(165, 0, 140, 40)];
        lblTotalAmount.text = @"amounts";
        lblTotalAmount.textAlignment = UITextAlignmentCenter;
        lblTotalAmount.textColor = [UIColor blackColor];
        lblTotalAmount.backgroundColor = [UIColor clearColor];
        lblTotalAmount.font = [UIFont systemFontOfSize:12];
        [cell addSubview:lblTotalAmount];

        UIButton *btnLine = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        btnLine.frame = CGRectMake(160, 0, 1, 40);
        [cell addSubview:btnLine];

        return cell;
    }
    return cell;
}

- (IBAction)btnAddDocument_click:(id)sender
{
    AddDocumentTableView *addDocumentTableView = [[AddDocumentTableView alloc] init];
    addDocumentTableView.managedObjectContext = managedObjectContext;
    [self.navigationController pushViewController:addDocumentTableView animated:YES];
}

2.this is the error:

2012-06-16 15:25:31.696 Account5[5534:fb03] 2
2012-06-16 15:25:31.704 Account5[5534:fb03] * Terminating app due to uncaught exception ‘NSRangeException’, reason: ‘* -[_PFArray objectAtIndex:]: index (2) beyond bounds (2)’
*** First throw call stack:

3.Let me describe the program. I can save data to data base with core data but when i want to fetch the data program jumps out.I have to consider that I think NSManagedObjectContext fetched data because fetchedObjects Array has 2 data because I inserted in.
and I have to say that my RootViewController is DocumentTableViewController it means that exactly when I run the program it crashes. And if I want to run the app I must comment DB_document *db_document = [fetchedObjects objectAtIndex:indexPath.row];

and after that app runs and I can insert data in another page.
I have to consider that when the app crashes it stops exactly on

DB_document *db_document = [fetchedObjects objectAtIndex:indexPath.row];

with green highlighted line.
thank you

Answer 1

Here is your problem:

In numberOfRowsInSection you add one to the fetchedResults array. Presumably, you want to add an additional row in that section. That is fine.

However, in cellForRowAtIndexPath you take indexPath.row as the index for your db_document. Obviously, in the last row it will crash. You have to first check in which row you are and then retrieve your db_document only if you need it for that particular row.