iOS tap counter app - more than one counter [closed] - ios

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I'm building an app for tap counting (for example: people going into the room).
The main goal is to be able to have multiple counters (for example: counter for main room, counter for white room, counter for green room etc.).
The app consists of:
A list of counters - CounterListTableViewController, with function
is to create new items (counters) in the list
A counter page - RowCounterViewController
I am stuck at the moment at: Saving count number of counters with reference to item in the TableViewController.
Possible solutions:
Save all count numbers into an array - I don’t know how yet (a complete beginner).
Save all count numbers in NSUserDefaults with its index, as suggested by KudoCC in answers bellow.
Thank you!
Last edit:
#import "RowCounterViewController.h"
#interface RowCounterViewController ()
#end
#implementation RowCounterViewController
-(IBAction)plus {
counter=counter + 1;
count.text = [NSString stringWithFormat:#"%i",counter];
}
-(IBAction)minus {
counter=counter - 1;
count.text = [NSString stringWithFormat:#"%i",counter];
}
-(IBAction)reset {
counter=0;
count.text = [NSString stringWithFormat:#"%i",counter];
}
- (void)viewDidLoad {
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(saveCount)
name:UIApplicationDidEnterBackgroundNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(saveCount)
name:UIApplicationWillTerminateNotification object:nil];
NSDictionary *dict = [[NSUserDefaults standardUserDefaults] objectForKey:#"saveCount"] ;
NSUInteger count = [dict objectForKey:#(itemIndex)] ;
//NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
//NSString *countString = [userDefaults objectForKey:#"saveCount"];
//NSLog(#"Your Count: %#",count);
//checking if data in user defaults is not empty
//if(countString.length>0)
//{
// count.text = [NSString stringWithFormat:#"%i",counter];
// counter = [countString intValue];
//}
//else
//{
// //for first time
// counter = 0;
// count.text = #"0";
//}
//counter=0;
//count.text = #"0";
[super viewDidLoad];
// Do any additional setup after loading the view.
}
-(void)saveCount {
NSDictionary *dict = [[NSUserDefaults standardUserDefaults] objectForKey:#"saveCount"] ;
NSMutableDictionary *mDict = [dict mutableCopy] ;
[mDict setObject:#(count) forKey:#(itemIndex)] ;
[[NSUserDefaults standardUserDefaults] setObject:mDict forKey:#"saveCount"] ;
[[NSUserDefaults standardUserDefaults] synchronize] ;
}
//- (void)dealloc {
// [self saveCount] ;
//}
- (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.
}
*/
#end

Answer 1

You can call [self saveCount] in dealloc method or viewWillDisappear:.
- (void)dealloc {
[self saveCount] ;
}
or:
- (void)viewWillDisappear:(BOOL)animated {
[self saveCount] ;
}
Update:
It seems that you want to keep the count for every item in your list. In order to achieve this, you must save the all the count in NSUserDefaults with its index, I recommend you to save NSDictionary which use index as its key and count as its value. So when you push into the RowCounterViewController, you should tell the index number of the item, so you can get its count in NSUserDefaults. When you leave the view controller, save its count to the index.
The code below is used to fetch the count for itemIndex, you should tell RowCounterViewController the item index before push or present it.
NSDictionary *dict = [[NSUserDefaults standardUserDefaults] objectForKey:#"saveCount"] ;
NSUInteger count = [[dict objectForKey:#(itemIndex)] unsignedIntegerValue] ;
The code below is used to save the count for itemIndex.
-(void)saveCount {
NSDictionary *dict = [[NSUserDefaults standardUserDefaults] objectForKey:#"saveCount"] ;
NSMutableDictionary *mDict = [dict mutableCopy] ;
[mDict setObject:#(count) forKey:#(itemIndex)] ;
[[NSUserDefaults standardUserDefaults] setObject:mDict forKey:#"saveCount"] ;
[[NSUserDefaults standardUserDefaults] synchronize] ;
}
and next bit of code in the list view controller:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"showDetail"]) {
// you can fetch the selected index path in this way.
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
RowCounterViewController *vc = (RowCounterViewController*)[segue destinationViewController];
// the currentIndex is the itemIndex I mentioned above.
vc.currentIndex = indexPath.row;
}
}

Answer 2

if you have more than one counter, you need an array to store all counter , and use UITableViewDelegate and UITableViewDatasource to present counters for rows in the tableview.
save the array to a file with this method
[array writeToFile:arrayFileName atomically:YES];
or you can use anything you can come up with to store it in
dealloc or viewWillDisappear
if you want to communicate between your tableview and RowCounterViewController, say RowCounterViewController passing the counter number back to tableview and present it in the related item, you can use delegate or notification.
that's something you need to learn in the future.
you can find some demo about it.
good luck.