Question

I have two views.In One view when i click on custom button it goes into second view,In that i have text view and that data must store in temperary memory so i used following code:

NSString *myString=txtvNote.text;
[txtvNote setText:@""];

NSUserDefaults *standardUserDefaults = [NSUserDefaults standardUserDefaults];

if (standardUserDefaults) {
    [standardUserDefaults setObject:myString forKey:@"note"];
    [standardUserDefaults synchronize];
}

and when i go back on 1st view by clicking on the add button it will save into database for that i used following code:

NSUserDefaults *standardUserDefaults = [NSUserDefaults standardUserDefaults];
NSString *val = nil;

if (standardUserDefaults) 
    val = [standardUserDefaults objectForKey:@"note"];
NSLog(@"Note::%@",val);

and then pass this value in insert query.
Now my problem is when i left that value blank,it takes the value which is inserted before.

Answer 1

myString is a pointer to the text in txtvNote. So if you set that text to @”” then myString will be empty as well. To preserve the value of txtvNote at the time of assignment use copy or reset the text after saving it:

 NSString *myString=[[txtvNote.text copy] autorelease]; 
 [txtvNote setText:@""];
 ....