NSUserDefaults Saving only last entered data - ios

Question

I am saving Textfield text using NSUserDefaults on button click in ViewController2
My code is
ButtonClick()
{
NSUserDefaults *userDefaults =[NSUserDefaults standardUserDefaults];
[userDefaults setObject:keyWordField.text forKey:#"Keywords"];
[userDefaults synchronize];
}
Then ViewDidLoad method i am Retrieving like this
-(void)viewDidLoad
{
NSUserDefaults *userDefaults =[NSUserDefaults standardUserDefaults];
[keyWordArray addObject:[userDefaults objectForKey:#"Keywords"]];
[userDefaults synchronize];
}
Here i am assigning this keyWordArray to tableview
like cell.textlabel.text =[keyWordArray objectAtIndex:indexPath.row];
First i entered text(First) in textfield and click button it is showing in table like
First
Second time i entered text (second) in textfield and click button it is showing table like
First
Second
Here everything working fine. The problem is when i come to viewController2 from ViewController1. It is showing last entered value only
like
Second
what going wrong here?

Answer 1

Try This
- (IBAction)buttonclick:(id)sender {
[keyWordArray addObject:keyWordField.text];
NSUserDefaults *userDefaults =[NSUserDefaults standardUserDefaults];
[userDefaults setObject:keyWordArray forKey:#"Keywords"];
[userDefaults synchronize];
[selt.tableView reload]; //reload the table every time a new text is added
}
-(void)viewDidLoad {
if([[NSUserDefaults standardUserDefaults] objectForKey:#"Keywords"]==nil){
keyWordArray = [[NSMutableArray alloc] init];
}
else{
keyWordArray = [[NSUserDefaults standardUserDefaults] objectForKey:#"Keywords"];
}
}

Answer 2

Try this,
- (IBAction)buttonclick:(id)sender {
[keyWordArray addObject:keyWordField.text];
NSUserDefaults *userDefaults =[NSUserDefaults standardUserDefaults];
[userDefaults setObject:keyWordArray forKey:#"Keywords"];
[userDefaults synchronize];
}
and
-(void)viewDidLoad
{
NSArray *array = [[NSUserDefaults standardUserDefaults] objectForKey:#"Keywords"];
if (!array) {
keyWordArray = [[NSMutableArray alloc] init];
} else {
keyWordArray = [NSMutableArray arrayWithArray:nameArray];
}
}

Answer 3

Since you are overriding your
[userDefaults setObject:keyWordField.text forKey:#"Keywords"];
every then and there your every object in the array will be referring to your [userDefaults setObject:keyWordField.text forKey:#"Keywords"]; object thats y the problem comes

Answer 4

Because if you are navigate to another viewController. since the your user default value save in second only.
After pop to back through viewDidLoad is loaded. so far its have second string only save in User Default.
that way it display second only.

Answer 5

You code is overwrite the last value and remove previous values from NSUserDefault. You have to use array to stored all value and you have save array into NSUserDefault.
NSMutableArray *aryDataDefault = [[NSUserDefaults standardUserDefaults] valueForKey:#"YourKey"];
[aryDataDefault addObject:textfield.text];
[[NSUserDefaults standardUserDefaults] setObject:aryDataDefault forKey:#"YourKey"];
[[NSUserDefaults standardUserDefaults] synchronize];