How to save the checkmarks in uitableview and show them when the user comes back again to the view?

Question

I am using the following code for showing the checkmarks in the uitableview

  {
  //  NSArray *tableContents;
    NSMutableArray *selectedMarks; // You need probably to save the selected cells for use in the future.
}
@property (strong, nonatomic) IBOutlet UITableView *languageTableView;
@property (nonatomic, strong) NSArray *tableContents;

@end

@implementation QPLanguageSettingsController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self initialisation];
    selectedMarks = [NSMutableArray new];
}
#pragma mark - View Life Cycle

-(void)initialisation
{
    _tableContents = [NSArray arrayWithObjects:@"English",@"Spanish",@"Russian",@"Arabic",@"Portuguese",@"French",@"German",@"German",@"German",@"German",@"German",@"German",@"German",@"German", nil];
}

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

#pragma mark - UITableView delegate & datasources

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return 14;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"newFriendCell";
    UITableViewCell *cell = (UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    //etc.

    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    cell.textLabel.textColor = [UIColor whiteColor];
    cell.backgroundColor = [UIColor clearColor];
    [cell setIndentationLevel:3];
    [cell setIndentationWidth:10];
     NSString *text = [_tableContents objectAtIndex:[indexPath row]];
     //cell.isSelected = [selectedMarks containsObject:text] ? YES : NO;
     cell.textLabel.text = text;
     NSDictionary *item = [_tableContents objectAtIndex:indexPath.row];
    if ([selectedMarks containsObject:item])
    {
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
    }
    else
    {
        cell.accessoryType = UITableViewCellAccessoryNone;

    }

    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    //if you want only one cell to be selected use a local NSIndexPath property instead of array. and use the code below
    //self.selectedIndexPath = indexPath;

    //the below code will allow multiple selection
     NSDictionary *item = [_tableContents objectAtIndex:indexPath.row];
    if ([selectedMarks containsObject:item])
    {
        [selectedMarks removeObject:item];
    }
    else
    {
        [selectedMarks addObject:item];
    }
    [tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
}

But the problem is that when i come again to the view controller all the checkmarks disappears. how to solve it. Remember i am using multiple selection in uitableview.

Store data in Core-data or Sqlite or Plist or User Defaults. — Bista, Sep 27 '16 at 12:20
save you check mark in array and then save array using userdefaults `[[NSUserDefaults standardUserDefaults] setObject:yourdataAry forKey:@"checkMarks"];` or use local db. — vaibhav, Sep 27 '16 at 12:28
@Ashley Rodrigues please check my code.. i will add a sample project to test — KSR, Sep 27 '16 at 13:16
@Ashley Rodrigues i added a sample project to my GitHub..please check it and reply — KSR, Sep 27 '16 at 13:25

score 3 · Accepted Answer · answered Sep 27 '16 at 12:30

I tried the to get solution for your question.I got it successfully.It works perfectly.

This is sample one.Try this code.It works fine.

ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>

@property (strong, nonatomic) IBOutlet UITableView *tableViewCheckMarkPreviousSelectionUpdate;
@end

ViewController.m

#import "ViewController.h"

@interface ViewController ()
{
   NSMutableArray *arrProductSelection,*arrProductSelectDeSelectCheckMark;
   NSArray *arrayFetchFromDefaults;
}

@end

@implementation ViewController

@synthesize tableViewCheckMarkPreviousSelectionUpdate;

- (void)viewDidLoad
{
   [super viewDidLoad];
   arrProductSelection = [[NSMutableArray alloc]initWithObjects:@"iPhone",@"iPad",@"iPod",@"iTV",@"iWatch",@"iMac",nil];
}
- (void)didReceiveMemoryWarning
{
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
}
-(void)viewWillAppear:(BOOL)animated
{
  NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
  arrayFetchFromDefaults = [userDefaults objectForKey:@"selectedcheckmark"];
  arrProductSelectDeSelectCheckMark = [[NSMutableArray alloc]initWithArray:arrayFetchFromDefaults];
  if(arrProductSelectDeSelectCheckMark.count == 0)
  {
     arrProductSelectDeSelectCheckMark = [[NSMutableArray alloc]init];
     for(int j=0;j<[arrProductSelection count];j++)
     {
        [arrProductSelectDeSelectCheckMark addObject:@"deselected"];
     }
   }
   [tableViewCheckMarkPreviousSelectionUpdate reloadData];
}

#pragma mark - UITableViewDataSource Methods
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
   return 1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
  return arrProductSelection.count;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
   NSString *strCell = @"cell";
   UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:strCell];
   if(cell==nil)
   {
     cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:strCell];
   }
   if([[arrProductSelectDeSelectCheckMark objectAtIndex:indexPath.row] isEqualToString:@"deselected"])
     cell.accessoryType = UITableViewCellAccessoryNone;
   else
     cell.accessoryType = UITableViewCellAccessoryCheckmark;
   cell.textLabel.text = [arrProductSelection objectAtIndex:indexPath.row];
   return cell;
}

#pragma mark - UITableViewDelegate Methods
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    @try
    {
        CGPoint touchPoint = [cell convertPoint:CGPointZero toView:tableViewCheckMarkSelectionUpdate];
        NSIndexPath *indexPath = [tableViewCheckMarkSelectionUpdate indexPathForRowAtPoint:touchPoint];
        NSLog(@"%@",arrProductSelectDeSelectCheckMark);
        if([arrProductSelectDeSelectCheckMark count]==0)
        {
           for(int i=0; i<[arrProductSelection count]; i++)
           {
             [arrProductSelectDeSelectCheckMark addObject:@"deselected"];
           }
        }
        if([[arrProductSelectDeSelectCheckMark objectAtIndex:indexPath.row] isEqualToString:@"deselected"])
        {
           cell.accessoryType = UITableViewCellAccessoryCheckmark;
           [arrProductSelectDeSelectCheckMark replaceObjectAtIndex:indexPath.row withObject:@"selected"];
        }
        else
        {
           cell.accessoryType = UITableViewCellAccessoryNone;
           [arrProductSelectDeSelectCheckMark replaceObjectAtIndex:indexPath.row withObject:@"deselected"];
        }

        NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
        [defaults setObject:arrProductSelectDeSelectCheckMark forKey:@"selectedcheckmark"];
        [defaults synchronize];
      }
   @catch (NSException *exception) {
    NSLog(@"The exception is-%@",exception);
   }
}
@end

in arrProductSelectDeSelectCheckMark array we get selected and deselected items. — user3182143, Sep 27 '16 at 13:10

score 0 · Answer 2 · edited May 23 '17 at 12:00

0

You have multiple solutions:

Using a rational DB on the device like Core-data or SQLite which actually fits your use case but number 3 is more suitable for your use case.
Using NSUserDefaults:

At runtime, you use an NSUserDefaults object to read the defaults that your application uses from a user’s defaults database. NSUserDefaults caches the information to avoid having to open the user’s defaults database each time you need a default

You can find an example here. But NSUserDefaults is to save settings/config/setup information or perhaps user info and NOT for the use case you need.

Using NSCoder which is in my opinion fits your use case.

edited May 23 '17 at 12:00

Community

1
1

answered Sep 27 '16 at 12:27

OhadM

4,687
1
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please tell me how to use nsuserdefaults – Ashley Rodrigues Sep 27 '16 at 12:29
Did you read the answer ? Also, you should avoid saving what you need in NSUserDefaults. What you need is NSCoder. – OhadM Sep 27 '16 at 12:29

score 0 · Answer 3 · answered Sep 27 '16 at 12:34

you can create a Singleton and store data on it :

Singleton.h

@interface Singleton : NSObject

@property (nonatomic, strong) NSArray *rowsChecked;

+ (Singleton *)sharedInstance;
+ (NSArray  *)getRowsChecked;
+ (void)setRowsChecked:(NSArray *)rowsChecked;

@end

Singleton.m

    #import "Singleton.h"

@implementation Singleton

        static Singleton *sharedObject;

        + (Singleton *)sharedInstance;
        {
            if (sharedObject == nil) {
                static dispatch_once_t pred;
                dispatch_once(&pred, ^{
                    sharedObject = [[Singleton alloc] init];
                });
            }
            return sharedObject;
        }

        + (NSArray *)getRowsChecked
        {
            Singleton *singleton = [Singleton sharedInstance];
            return singleton.rowsChecked;
        }

        + (void)setRowsChecked:(NSArray *)rowsChecked
        {
            Singleton *singleton = [Singleton sharedInstance];
            singleton.rowsChecked= rowsChecked;
        }

    @end

and to access to your Singleton :

[[Singleton sharedInstance] getRowsChecked]

// or

[[Singleton sharedInstance] setRowsChecked:anArray];

cool, then how he insert and get the checked array by following your ans ? — vaibhav, Sep 27 '16 at 12:38
then how many instance can be saved at a time ..what if multiple checkmark array need to save ? — vaibhav, Sep 27 '16 at 12:48

KSR · Answer 4 · 2016-09-27T13:24:37.760

Use the following code:

#import "ViewController.h"

@interface ViewController ()<UITableViewDelegate, UITableViewDataSource>
@property (weak, nonatomic) IBOutlet UITableView *languagesTableView;

@property (strong, nonatomic) NSArray *languagesArray;

@property (strong, nonatomic) NSMutableArray *checkMarksArray;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    [self.languagesTableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];
    self.languagesArray = [NSArray arrayWithObjects:@"English",@"Spanish",@"Russian",@"Arabic",@"Portuguese",@"French",@"German", nil];
    self.checkMarksArray = [[NSMutableArray alloc]init];
    if( [[NSUserDefaults standardUserDefaults]objectForKey:@"selectedRowsArray"])
    {
       self.checkMarksArray = [[[NSUserDefaults standardUserDefaults]objectForKey:@"selectedRowsArray"] mutableCopy];
    }
}


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


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return self.languagesArray.count;

}

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

    UITableViewCell *languagesCell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];
    languagesCell.textLabel.text = self.languagesArray[indexPath.row];
    if([self.checkMarksArray containsObject:[NSNumber numberWithLong:indexPath.row]])
    {
        languagesCell.accessoryType = UITableViewCellAccessoryCheckmark;
    }
    else
    {
        languagesCell.accessoryType = UITableViewCellAccessoryNone;
    }

    [[NSUserDefaults standardUserDefaults]setObject:self.checkMarksArray forKey:@"selectedRowsArray"];
    [[NSUserDefaults standardUserDefaults]synchronize];

    return languagesCell;


}

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

    if([self.checkMarksArray containsObject:[NSNumber numberWithLong:indexPath.row]])
    {
        [self.checkMarksArray removeObject:[NSNumber numberWithLong:indexPath.row]];
    }
    else
    {
        [self.checkMarksArray addObject:[NSNumber numberWithLong:indexPath.row]];
    }

    [self.languagesTableView reloadData];
}

@end

Check this GitHub link:

https://github.com/k-sathireddy/TableViewSelectedCheckMarks

i have checked ... Is there any way to get the selected rows values appended by comma?? — Ashley Rodrigues, Sep 28 '16 at 10:01

How to save the checkmarks in uitableview and show them when the user comes back again to the view?

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