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POStrange error: insertRowsAtIndexPaths in UITableView crashes with NSInternalInconsistencyException
 

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  1. POStrange error: insertRowsAtIndexPaths in UITableView crashes with NSInternalInconsistencyException
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    <p>I have searched for a more fitting answer to <code>NSInternalInconsistencyException</code> I receive in the following sample app I wrote, but still nothing. The goal is to create an expand/collapse functionality for the top row in each section of the tableView. Right now I try to implement the expand part, and this works for row 0 in section 0. As soon as the user taps row 0 in another section this error appears:</p> <p></p> <p><pre><code>** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Unable to resolve row for index path: 2 indexes [0, 1]'</pre></code></p> <p></p> <p>This is strange since I store each and every <code>UITableViewCell</code> for the table in a mutable array of arrays. <code>NSMutableArray *cellForRow</code>, where each index represents a section in the table and each object is an object of type <code>NSMutableArray</code>. I do this to avoid any issues arising from queueing reusable cells that I first thought triggered the above exception.</p> <p></p> <p>The exception happens at the <code>insertRowsAtIndexPaths</code> statement. I read earlier here that the <code>UITableViewController</code> code must keep track of changes to the number of rows caused by insertions/deletion. I believe I do that with <code>NSMutableArray *rowsInSection</code> so that the <code>UITableView</code> data source method:</p> <p></p> <p><pre><code>- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section </pre></code></p> <p></p> <p>returns the correct number of rows in a section after a change.</p> <p></p> <p>What am I doing wrong in my code to get the above mentioned exception?</p> <p></p> <hr> <p>This is the interface file:</p> <p></p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #import &lt;QuartzCore/QuartzCore.h&gt; @interface MasterViewController : UITableViewController { NSMutableArray *rowsInSection; NSMutableArray *cellForRow; } @property (nonatomic,strong) NSMutableArray *rowsInSection; @property (nonatomic,strong) NSMutableArray *cellForRow; @end </code></pre> <p></p> <p>And this is the implementation file:</p> <p></p> <pre><code>#import "MasterViewController.h" const NSInteger numSections = 4; const NSInteger numRows = 1 + 4; const NSInteger addRemoveRows = 4; @implementation MasterViewController @synthesize rowsInSection; @synthesize cellForRow; - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { self.title = @"Table View"; rowsInSection = [NSMutableArray arrayWithCapacity:numSections]; cellForRow = [NSMutableArray arrayWithCapacity:numSections]; } return self; } #pragma mark - View lifecycle - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. self.tableView.backgroundColor = [UIColor clearColor]; self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone; self.tableView.dataSource = self; self.tableView.delegate = self; // add number of rows for section for (NSInteger i = 0; i &lt; numSections; i++) { [self.rowsInSection addObject:[NSNumber numberWithInteger:1]]; } // container for reusable table view cells for (NSInteger i = 0; i &lt; numSections; i++) { NSMutableArray *rowsArray = [NSMutableArray arrayWithCapacity:numRows]; for (NSInteger j = 0; j &lt; numRows; j++) { // top row in section if (j == 0) { UITableViewCell *topCell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:nil]; topCell.accessoryType = UITableViewCellAccessoryNone; topCell.contentView.backgroundColor = [UIColor whiteColor]; topCell.textLabel.textColor = [UIColor blueColor]; [rowsArray addObject:topCell]; // the rest } else { UITableViewCell *simpleCell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:nil]; simpleCell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; simpleCell.textLabel.textColor = [UIColor whiteColor]; [rowsArray addObject:simpleCell]; } } // add rows for current section into cell container [self.cellForRow addObject:rowsArray]; } } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown); } // Customize the number of sections in the table view. - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return numSections; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { NSInteger rows = [(NSNumber *)[self.rowsInSection objectAtIndex:section] integerValue]; //NSLog(@"%@",self.rowsInSection); //NSLog(@"Rows: %d in section: %d",rows,section); return rows; } // Customize the appearance of table view cells. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { // Configure the cell. // row count NSLog(@"Rows: %d in section: %d",[tableView numberOfRowsInSection:indexPath.section],indexPath.section); if (indexPath.row == 0) { UITableViewCell *cell = (UITableViewCell *)[[self.cellForRow objectAtIndex:indexPath.section] objectAtIndex:indexPath.row]; cell.textLabel.text = @"TOP ROW"; NSLog(@"Row: %d in section: %d - %@",indexPath.row,indexPath.section,cell); return cell; } else { UITableViewCell *cell = (UITableViewCell *)[[self.cellForRow objectAtIndex:indexPath.section] objectAtIndex:indexPath.row]; cell.textLabel.text = [NSString stringWithFormat:@"row: %d",indexPath.row]; NSLog(@"Row: %d in section: %d - %@",indexPath.row,indexPath.section,cell); return cell; } // not reaching here return nil; } - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { return [NSString stringWithFormat:@"Section %d",section]; } #pragma mark - Row editing - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { // add table view cells to section if tapped on top row if (indexPath.row == 0 &amp;&amp; [tableView numberOfRowsInSection:indexPath.section] == 1) { //NSLog(@"Selected row: %d in section: %d",indexPath.row,indexPath.section); NSMutableArray *indexPathArray = [NSMutableArray array]; for (NSInteger i = 1; i &lt;= addRemoveRows; i++) { NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:indexPath.section]; [indexPathArray addObject:indexPath]; } // update row count for section NSInteger newRowCount = addRemoveRows + 1; // +1 for existing top row [self.rowsInSection replaceObjectAtIndex:indexPath.section withObject:[NSNumber numberWithInteger:newRowCount]]; [tableView beginUpdates]; [tableView insertRowsAtIndexPaths:indexPathArray withRowAnimation:UITableViewRowAnimationTop]; [tableView endUpdates]; } } @end </code></pre>
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    1. COMove the `[tableView beginUpdates];` up above the row count update code.
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      1. USdarvids0n
 

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