CODEWITHSUNDEEP
iphoneobjective-ciosuitableview
Hashmat Khalil
Hashmat Khalil

Reputation: 1816

uitableview show 3 object per row

I have an array with 20 objects. there can be more objects in that array. for simplicity reason lets say its only nsstring object in that array.

i want to show 3 of those elements in every row. so number of rows are

- (NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 {
  int i = 0;

if ( ([myArray count] % 3) > 0 )
{
    i++;
}
return [myArray count] / 3 + i;

}

i have a helper veriable int lastObj=0

    - (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

if (cell == nil)
{
  ---instaniate the cell

   for (int i = 1; i <= 3; i++)
    {
        if (lastObj <= [myArray count])
        {
            --create cell content
            -- cellContent.myLabel.text=[myArray onbjectAtIndex:lastObj]
            --add cellContent to cell 
            lastObj++;

        }
    }
return cell;
}

so if i have 5 objects in that array, then they get displayed properly. but if it the list has 14 elements then the first 9 elements gets display and it starts from element 0 and the rest dont show up. on the app you can see 3 rows and each have 3 elements of array. so i'm trying to mimic 3 columns.

any idea how i can resolve this issue?

Upvotes: 0

Views: 1947

Answers (3)

Hermann Klecker
Hermann Klecker

Reputation: 14068

Try this: 

    - (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil)
    {
      ---instaniate the cell
      cell = [[UITableViewCell alloc] init]; //If you don't ARC then retain accordingly. 

    }

       for (int i = indexPath.row * 3 ; i < indexPath.row * 3 + 3; i++)
        {


            if (i <= [myArray count])
            {

                --create cell content
                -- cellContent.myLabel.text=[myArray onbjectAtIndex:i]
                --add cellContent to cell 
                //forget about your last object helper. That would not work anyway. 

            }
        }
    return cell;
}

The Point is that cellForRowAtIndexPath is not nessessarily called in a certain sequence. It is rather coincidence that it is called for the first to seventh row from start. Theoretically it could be called in any sequence. Think of this: Your table has 30 rows. 10 of thes are visible at once. At the beginning it is called for row 0 to 9. But understand that as a coincidence. It could be called in any sequence. Then the user scrolls for 5 rows. The method is then called for cell 10 to 14. In this case the cells will be re-used. Your if (cell==nil) branch will not be entered. Again in a row. Then the user crolls back 2 rows. Next calls of the method would be for row 9 and 8 - in that sequence.

So do never ever assume a certain sequence here, even if you seem to observe a certain sequence.

Upvotes: 0

John Smith
John Smith

Reputation: 2032

- (NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 {
   return ceil(((float)[myArray count]) / 3.0);
  }

- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

if (cell == nil)
{
  ---instaniate the cell
}
   //initiate 3 labels, then say:

   if(myArray.count-1 >= IndexPath.row * 3)
       cellContent.myLabel_1.text=[myArray onbjectAtIndex:IndexPath.row * 3];

   if(myArray.count-1 >= (IndexPath.row * 3)+1)
       cellContent.myLabel_2.text=[myArray onbjectAtIndex:(IndexPath.row * 3)+1];

   if(myArray.count-1 >= (IndexPath.row * 3)+2)
       cellContent.myLabel_3.text=[myArray onbjectAtIndex:(IndexPath.row * 3)+2];

   //the above "if"-s are to prevent reading values out of the array's bounds
   //add labels to cell 

    return cell;
}

Upvotes: 2

Bradley
Bradley

Reputation: 617

There is currently only 1 text label in the cell you are trying to insert 3 text labels in. You seem to be close but I think the best option is to create a custom table cell with three text labels and then set them as you are currently doing here is a tutorial to setup custom tabel cells: http://www.appcoda.com/customize-table-view-cells-for-uitableview/

Upvotes: 0

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