Saving and restoring NSMutablearray to NSUserdefaults - ios

Question

I am writing a app that needs to save and restore nsmutablearrays to populate a table view. The array will save but won't overwrite once i reset everything. i find that the values are combining together and is giving me unreliable averages... code is below. also i have various view controllers that have this lap function...
// code that adds items to table view and saves a version of the array to nsmutablearray
NSUserDefaults *prefs = [[NSUserDefaults alloc]
initWithSuiteName:#"group.com.DJ.TSTML"];
[tableItems3 insertObject:TimeString2 atIndex:0];
// time string is the time as a nsstring
[tableItems4 addObject:[NSNumber numberWithFloat:seconds2]];
[tableview reloadData];
[prefs setObject:self.tableItems4 forKey:#"SavedArray3"];
[prefs setObject:self.tableItems3 forKey:#"SavedArray4"];
// this is saving to insurer defaults
NSString *newString = [NSString stringWithFormat:#"%lu", (unsigned long)tableItems3.count];
[Commentcount setText:newString];
NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
NSNumber *average = [tableItems4 valueForKeyPath:#"#avg.self"];
Average.text = [formatter stringFromNumber:average];
NSLog(#"Sucess");
[prefs synchronize];
} }
Restoring the array :
NSUserDefaults *prefs = [[NSUserDefaults alloc]
initWithSuiteName:#"group.com.DJ.TSTML"];
// code used to erase current values in the table view and restore from NSUserDefaults
tableItems3 = [[NSMutableArray alloc] init];
tableItems4 = [[NSMutableArray alloc] init];
[tableview reloadData];
NSMutableArray *RestoreArray1 = [[prefs objectForKey:#"SavedArray4"]mutableCopy];
NSMutableArray *RestoreArray2 = [[prefs objectForKey:#"SavedArray3"]mutableCopy];
[tableItems3 addObjectsFromArray:RestoreArray1];
[tableItems4 addObjectsFromArray:RestoreArray2];
if (tableItems3 == nil) {
tableItems3 = [[NSMutableArray alloc] init];
tableItems4 = [[NSMutableArray alloc] init];
}
[tableview reloadData];
NSLog(#"%#",tableItems4);
}
}
Thank you in advance for any help!
My issue to be clear is that every time i save to nsuserdefaults instead of overwriting the previous array it just keeps the old array and combines with the new one

Answer 1

Ok so i answered my own question. As someone brought up it was combining because i was retrieving without overwriting it first. the following code is what worked...
NSString *Clearstring = [prefs objectForKey:#"Clear?"];
// i created a nsstring that when the method for restarting would change accordingly.
// so when someone would navigate to this view controller this would fire.
// if clear is yes i would prevent the code that controled the restore function from restoring and prepare
// it if it was needed to be restored again.
if ([Clearstring isEqualToString:#"Yes"]) {
tableItems3 = [[NSMutableArray alloc] init];
tableItems4 = [[NSMutableArray alloc] init];
[prefs setObject:self.tableItems4 forKey:#"SavedArray3"];
[prefs setObject:self.tableItems3 forKey:#"SavedArray4"];
[prefs setObject:#"NO" forKey:#"Clear?"];
[tableview reloadData];
}
else{
tableItems3 = [[NSMutableArray alloc] init];
tableItems4 = [[NSMutableArray alloc] init];
[tableview reloadData];
NSMutableArray *RestoreArray1 = [[prefs objectForKey:#"SavedArray4"]mutableCopy];
NSMutableArray *RestoreArray2 = [[prefs objectForKey:#"SavedArray3"]mutableCopy];
[tableItems3 removeAllObjects];
[tableItems4 removeAllObjects];
[tableItems3 addObjectsFromArray:RestoreArray1];
[tableItems4 addObjectsFromArray:RestoreArray2];
if (tableItems3 == nil) {
tableItems3 = [[NSMutableArray alloc] init];
tableItems4 = [[NSMutableArray alloc] init];
}
[tableview reloadData];
NSLog(#"%#",tableItems4);
}
}