CODEWITHSUNDEEP
iosuitableview
Ravi Ojha
Ravi Ojha

Reputation: 1480

increment,decrement on label when click the + or - button in ios

I want to make a type of view where I have a custom cell to show the item list and a button to add and remove items (+/-).

When I click the add or remove button I want it to work for only one cell and increase the value of the cell.

For now, it works but it increases everything in the cell, how can I manage this for each independent cell ?

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

  TableViewCell *cell =
      (TableViewCell *)[_tableView dequeueReusableCellWithIdentifier:@"Cell"];
  cell.addButton.tag = indexPath.row;
  cell.removeButton.tag = indexPath.row;
  cell.itemName.text = [models objectAtIndex:indexPath.row];
  cell.itemPrice.text = [[stock objectAtIndex:indexPath.row] stringValue];
  cell.count = [NSNumber numberWithInt:i];
  cell.quantityLbl.text = [NSString stringWithFormat:@"%@", cell.count];
  cell.quantityLbl.layer.cornerRadius = YES;
  cell.quantityLbl.layer.borderWidth = 1.0;
  return cell;
}

On add Button:-

- (IBAction)addButton:(id)sender {
  NSInteger num = [sender tag];
  i = i + 1;
  NSIndexPath *rowToReload = [NSIndexPath indexPathForRow:num inSection:0];
  NSArray *rowsToReload = [NSArray arrayWithObjects:rowToReload, nil];
  [_tableView reloadRowsAtIndexPaths:rowsToReload
                    withRowAnimation:UITableViewRowAnimationNone];
}

enter image description here

Upvotes: 3

Views: 5981

Answers (4)

KDeogharkar
KDeogharkar

Reputation: 10959

-(IBAction)addButton:(id)sender{

TableViewCell *cell;
// check device version
if(SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0")){
   cell = (TableViewCell*)((UIButton*)sender).superview.superview.superview;
}
else{
cell = (TableViewCell*)((UIButton*)sender).superview.superview.superview.superview;
}

   cell.lblNumber.text = [NSString stringWithFormat:@"%d",[cell.lblNumber.text intValue]+1];
}

macro

#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)

Upvotes: 4

Ravi
Ravi

Reputation: 2451

try this

- (IBAction)addButton:(id)sender 
{
  NSInteger num = [sender tag];
  i = i + 1;

  UIButton * button = (UIButton*)sender;
  CGPoint buttonPosition = [button convertPoint:CGPointZero toView: _tableView];

  NSIndexPath *indexPathToReload = [_tableView  indexPathForRowAtPoint:buttonPosition];
  NSArray *rowsToReload = [NSArray arrayWithObjects:indexPathToReload, nil];
  [_tableView reloadRowsAtIndexPaths:rowsToReload
                    withRowAnimation:UITableViewRowAnimationNone];
}

Upvotes: 0

Mohd Prophet
Mohd Prophet

Reputation: 1521

Use this if you are updating only 1 cell:-

[NSArray arrayWithObject:rowToReload];

instead of:-

NSArray *rowsToReload = [NSArray arrayWithObjects:rowToReload, nil];

Upvotes: 0

Gazzini
Gazzini

Reputation: 738

You need to make another array, called "count" or something, and initialize it to be the same length as your "models" array, that initially has several NSNumber objects with an integer value of 0.

Then, change your add button code to look like this:

- (IBAction)addButton:(id)sender {
  NSInteger num = [sender tag];
  int value = [count[num] integerValue];
  value += 1;
  count[num] = @(value);
  NSIndexPath *rowToReload = [NSIndexPath indexPathForRow:num inSection:0];
  NSArray *rowsToReload = [NSArray arrayWithObjects:rowToReload, nil];
  [_tableView reloadRowsAtIndexPaths:rowsToReload
                    withRowAnimation:UITableViewRowAnimationNone];
}

And make sure you update your cellforrowatindexpath function as well:

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

  TableViewCell *cell =
      (TableViewCell *)[_tableView dequeueReusableCellWithIdentifier:@"Cell"];
  cell.addButton.tag = indexPath.row;
  cell.removeButton.tag = indexPath.row;
  cell.itemName.text = [models objectAtIndex:indexPath.row];
  cell.itemPrice.text = [[stock objectAtIndex:indexPath.row] stringValue];
  cell.count = count[indexPath.row];
  cell.quantityLbl.text = [NSString stringWithFormat:@"%@", cell.count];
  cell.quantityLbl.layer.cornerRadius = YES;
  cell.quantityLbl.layer.borderWidth = 1.0;
  return cell;
}

Upvotes: 1

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