How can I remove data from the array when uncheck the cell in UITableview?

Question

I have made one sample demo. Like selected cell print after "Done"button clicked. It is working fine.

Code is

@synthesize arrayContainer,filteredRecipes,myTableView,filtered,selectedRaw;


- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.arrayContainer = [[NSMutableArray alloc]initWithObjects:@"One",@"Two",@"Three",@"Four",@"Five",@"Six",@"Seven",@"Eight",@"Nine", nil];
    self.selectedRaw = [[NSMutableArray alloc]init];

}

-(IBAction)printSelectedItem:(id)sender
{
    NSLog(@"The Selected Items are %@",self.selectedRaw);
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if(filtered == YES)
    {
        return self.filteredRecipes.count;

    }
    else
    {
        return self.arrayContainer.count;

    }
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *identifier = @"myCell";

    UITableViewCell *cell =[tableView dequeueReusableCellWithIdentifier:identifier];

    if(filtered == YES)
    {
        cell.textLabel.text = [self.filteredRecipes objectAtIndex:indexPath.row];

    }
    else
    {
        cell.textLabel.text = [self.arrayContainer objectAtIndex:indexPath.row];

    }


    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(nonnull NSIndexPath *)indexPath{
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];


    if (cell.accessoryType == UITableViewCellAccessoryCheckmark) {

        cell.accessoryType = UITableViewCellAccessoryNone;
        // NSString *string = [self.selectedRaw objectAtIndex:indexPath.row];

        [self.selectedRaw removeObjectAtIndex:indexPath.row];

    } else {

        cell.accessoryType = UITableViewCellAccessoryCheckmark;
        NSString *temp = [self.arrayContainer objectAtIndex:indexPath.row];
        [self.selectedRaw addObject:temp];
    }

}

- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar
{

    [searchBar setShowsCancelButton:YES animated:YES];
}


-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{

    if([searchText length] == 0)
    {
        self.filtered   = NO;
    }
    else
    {
        self.filtered = YES;

        self.filteredRecipes = [[NSArray alloc]init];

        NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"SELF contains[cd] %@",searchText];

        filteredRecipes = [self.arrayContainer filteredArrayUsingPredicate:resultPredicate];
    }

    [self.myTableView reloadData];
}

Question is

-> When I print selected row of table view ,Displayed in log perfectly.

-> But when I deselected those selected item it gives me n error.

Please give me solution.

My another question is when I have searched particular item (selected) it gives me selected item perfectly,then i deselect item after I have canceled searching then it gives me again selected item which I did deselect earlier.

Output image

selected Raw

Unchecked second raw

Answer 1

You have to remove data based on Object not based on Index so here you can go with below code:

1st you have to check filter condition in your didselect method

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(nonnull NSIndexPath *)indexPath{
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];


    if(filtered == YES)
      {
          if (cell.accessoryType == UITableViewCellAccessoryCheckmark) {

             cell.accessoryType = UITableViewCellAccessoryNone;
            [self.selectedRaw removeObject:[self.filteredRecipes objectAtIndex:indexPath.row]];

          } else {

             cell.accessoryType = UITableViewCellAccessoryCheckmark;
             [self.selectedRaw addObject:[self.filteredRecipes objectAtIndex:indexPath.row]]
          }


    }
    else
    {
       if (cell.accessoryType == UITableViewCellAccessoryCheckmark) {

          cell.accessoryType = UITableViewCellAccessoryNone;

          [self.selectedRaw removeObject:[self.arrayContainer objectAtIndex:indexPath.row]];

       } else {

          cell.accessoryType = UITableViewCellAccessoryCheckmark;
          [self.selectedRaw addObject:[self.arrayContainer objectAtIndex:indexPath.row]]
       }

    }
}

2nd Problem solution:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *identifier = @"myCell";

    UITableViewCell *cell =[tableView dequeueReusableCellWithIdentifier:identifier];

    if(filtered == YES)
    {
        cell.textLabel.text = [self.filteredRecipes objectAtIndex:indexPath.row];
        if([selectedRaw containsObject:self.filteredRecipes[indexPath.row]] ){
          cell.accessoryType = UITableViewCellAccessoryCheckmark;
        }else{
          cell.accessoryType = UITableViewCellAccessoryNone;
        }

    }
    else
    {
        cell.textLabel.text = [self.arrayContainer objectAtIndex:indexPath.row];
        if([selectedRaw containsObject:self.arrayContainer[indexPath.row]] ){
          cell.accessoryType = UITableViewCellAccessoryCheckmark;
        }else{
          cell.accessoryType = UITableViewCellAccessoryNone;
        }

    }


    return cell;
}

Hope This will helps you.

Answer 2

So please try this.

#import "SecondViewController.h"

@interface SecondViewController ()
@property(nonatomic,strong)NSArray *arrayContainer;
@property(nonatomic,strong)NSArray *filteredRecipes;
@property(nonatomic,strong)NSMutableArray *selectedRaw;
@property(nonatomic,assign)BOOL filtered;
@end

@implementation SecondViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    _arrayContainer = @[@"One",@"Two",@"Three",@"Four"];
//      _arrayContainer = [[NSMutableArray alloc]initWithArray:];
    _selectedRaw = [[NSMutableArray alloc]init];
    [self.tableView reloadData];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return 1;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    if(_filtered)
        return _filteredRecipes.count;
    else
        return _arrayContainer.count;
}

-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];

    if(_filtered){
        NSString *tmp = [_filteredRecipes objectAtIndex:indexPath.row];
        cell.textLabel.text = tmp;
        if([_selectedRaw containsObject:tmp])
            cell.accessoryType = UITableViewCellAccessoryCheckmark;
        else
            cell.accessoryType = UITableViewCellAccessoryNone;
    }else{
        NSString *tmp = [_arrayContainer objectAtIndex:indexPath.row];
        cell.textLabel.text = tmp;
        if([_selectedRaw containsObject:tmp])
            cell.accessoryType = UITableViewCellAccessoryCheckmark;
        else
            cell.accessoryType = UITableViewCellAccessoryNone;
    }
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(nonnull NSIndexPath *)indexPath{

    if(self.filtered){
        if([self.selectedRaw containsObject:[self.filteredRecipes objectAtIndex:indexPath.row]]){
             [self.selectedRaw removeObjectAtIndex:[self.selectedRaw indexOfObject:[self.filteredRecipes objectAtIndex:indexPath.row]]];
        }else{
            NSString *temp = [self.filteredRecipes objectAtIndex:indexPath.row];
            [self.selectedRaw addObject:temp];
        }
    }else{
        if([self.selectedRaw containsObject:[self.arrayContainer objectAtIndex:indexPath.row]]){
           [self.selectedRaw removeObjectAtIndex:[self.selectedRaw indexOfObject:[self.arrayContainer objectAtIndex:indexPath.row]]];
        }else{
            NSString *temp = [self.arrayContainer objectAtIndex:indexPath.row];
            [self.selectedRaw addObject:temp];
        }
    }
    [self.tableView reloadData];

}

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText{
    if([searchText length] == 0)
    {
        self.filtered   = NO;
    }
    else
    {
        self.filtered = YES;


        NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"SELF contains[cd] %@",searchText];

        _filteredRecipes = [self.arrayContainer filteredArrayUsingPredicate:resultPredicate];
    }

    [self.tableView reloadData];
}

-(void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar{
    _filtered = !_filtered;
}

-(void)searchBarTextDidEndEditing:(UISearchBar *)searchBar{
    _filtered = !_filtered;
}

@end

Answer 3

1: You have to take array with dictionary with parameter like

 [{
  value : “One”,
  state : “Check”
  },
  {
  value : “Two”,
  state : “UnCheck”
  }
  ]

then on cellForRowAtindexParth

 if (self.selectedRaw[indexPath.row] as !     NSDictionary).value(forKey:”state”) as! String == “Check”{
  //change to check mark
   }
  else{
  //change to UnCheck mark
  }

At DidSelectRowAtIndexPath

 if (cell.accessoryType == UITableViewCellAccessoryCheckmark) {

 if (arr[indexPath.row] as ! NSDictionary).value(forKey:”state”) as!          String == “Check”{
   //change state value to UnCheck
 }else{
    //change state value to Check
     }

     }

2:On second point you need to do same work