Invalid objectAtIndex access on the cell info array when calling a reloadData on the gridView and inverting the row and columns quantity.

I have a single row with multiple columns displayed in landscape and want to have a single column with multiple rows when displayed in portrait.

On the reloadData call, removeCellWithInfo is called with a cell info containing an invalid x, y value with the new rows and cells quantity.

After the gridView is initialized, if you call reloadData it removes all the cells but doesn't add them back. One specific suspicious spot is DTGridView ~line 384

if ([self.subviews count] > [self.gridCells count]) {

Problem is gridCells is a multidimensional array of the cells (row x column) where subviews is flat so that expression always evals to true. The meat of the issue is in checkViews, thats where cells should be added (it appears) but aren't, they're only added on initialiseViews.

Daniel

Please can you review & comment?

The two "greater than" tests for xPosition and yPosition should surely be "greater than or equal". If, for example info.yPosition = 3 and [gridCells count] = 3 then then next line [gridCells objectAtIndex:info.yPosition] evaluates to [gridCells objectAtIndex:3] and we get a range exception.

Regards

Chris & Murthy

• (void)removeCellWithInfo:(DTGridViewCellInfo *)info {

  if (info.yPosition > [gridCells count]) return;
  
  NSMutableArray *row = [gridCells objectAtIndex:info.yPosition];
  
  if (info.xPosition > [row count]) return;
  

Hi Daniel

I've love to use your grid view with the left-hand column pinned so that it's always in view. Can you think of any easy way of achieving this?

Regards

Chris

I've got a grid 4 columns by R rows. I'm filling this grid with data such that each row might be only partially filled - 3 out of the 4 columns for example. Only 2 rows are on screen at any time (except during scrolling). It is a normal DTGridView that scrolls vertically.

The problem occurs when I have 4 rows. The first 3 are completely full (4/4 columns), and the last row is only partially full (1/4 columns). The DTGridView allows me to scroll to the 4th row, but the cell in the 4th row, 1st column never appears. I put logging statements in the gridView:viewForRow:column: method, and the cell is never even asked for.

Here's my pseudo code

• (NSInteger)numberOfRowsInGridView:(DTGridView *)gridView {
  NSUInteger itemCount = ;
  return ceil((double)itemCount / (double)GRID_VIEW_NUM_VISIBLE_COLUMNS);
  }

• (NSInteger)numberOfColumnsInGridView:(DTGridView *)gridView forRowWithIndex:(NSInteger)index {
  NSUInteger itemCount = ;
  NSUInteger rows = [self numberOfRowsInGridView:gridView];
  NSUInteger numItemsIfFilled = GRID_VIEW_NUM_VISIBLE_COLUMNS * rows;
  BOOL lastRow = (index == rows - 1);
  BOOL gridFull = itemCount == numItemsIfFilled;

  NSInteger columns = GRID_VIEW_NUM_VISIBLE_COLUMNS;

  if (lastRow && !gridFull) {
  columns = itemCount % GRID_VIEW_NUM_VISIBLE_COLUMNS;
  }

  return columns
  }

• (CGFloat)gridView:(DTGridView *)gridView heightForRow:(NSInteger)rowIndex {
  return gridView.frame.size.height / GRID_VIEW_NUM_VISIBLE_ROWS;
  }

• (CGFloat)gridView:(DTGridView *)gridView widthForCellAtRow:(NSInteger)rowIndex column:(NSInteger)columnIndex {
  return gridView.frame.size.width / GRID_VIEW_NUM_VISIBLE_COLUMNS;
  }

• (DTGridViewCell *)gridView:(DTGridView *)gridView viewForRow:(NSInteger)rowIndex column:(NSInteger)columnIndex {
  return ;
  }

One thing to note is that when the number of rows fits on screen, the last row shows just fine. It is only when the last row does not fit on screen that it is not requested at all.

is there some limits to this grid that aren't documented?

I am trying to use this grid in a dynamic situation on a view controller, meaning the grid's data will change depending on actions taken on other parts of the screen. I also added landscape support as well and I am finding issues with the grid. When I need to refresh the data, I call [gridView reloadData], I assume this is what is needed to redraw and pickup the new values for number of rows/columns.

I am seeing weird things going on with Rows now not being rendered is some parts of the grid?

An easy way to see this test is to add the [gridView reloadData] to the selectionMadeAtRow event in the DTGridViewExampleDataSourceAndDelegate class.

This will break the grid to not show some rows, especially if you currently scrolled down far in a grid.

When dealing with screen rotation and/or updating the datasource, is there other steps I need to take to ensure the missing rows doesn't occur???

Hi All,

When using the DTInfiniteGridViewExampleViewController in the demo project it seems that this does not demonstrate infinite horizontal scroll, as it stops horizontally scrolling after 10 cycles of the Red/Blue/Orange/Yellow views. Looking through the source code nothing jumps out as constraining the scroll to 10 cycles, and given that it should be infinite scroll I thought that it would just continue scrolling ad infinitum.

I am running the code in the iPhone Simulator using SDK 4.2. Thanks in advance for any assistance.

Hi, I have trouble recharging the table. In doing so, the information is in the ranks just disappear. Try doing it this way,jpvasquez@4f536b5 , but got no positive results. I hope I can help.

DTGridView shows lot of memory leaks in loaddata function can you please look into it . thanks

spacingBetweenRowsInGridView and spacingBetweenColumnsInGridView are defined as optional methods in the DTGridViewDataSource protocol but don't appear to be referenced anywhere else in the code, so they have no effect. I'm still getting familiar with the code and will attempt to see how these might be implemented.

I want manage spacing between the columns in DTSnapGridView. But spacingBetweenColumnsInGridView method of DataSource never get called. any solution to above problem . kindly reply.