Question

I have set,

This is my below code in applicationwillterminate method.

NSString *string4 = @"Objective-C";

NSUserDefaults* defs7 = [NSUserDefaults standardUserDefaults];
[defs7 setObject:string4 forKey:@"subject_textfield"];

This is my below code in applicationdidfinishlaunching method.

NSUserDefaults* defs7 = [NSUserDefaults standardUserDefaults];
subject_textfield.text = [defs7 stringForKey:@"subject_textfield"];

but,when i press home and then i again launch application
at that time i’m getting nil value for subject_textfield.text.

Why is it so?

Answer 1

Use [[NSUserDefaults standardUserDefaults] synchronize]; to enforce that NSUserDefaults are getting saved.

Reference:

Because this method is automatically
invoked at periodic intervals, use
this method only if you cannot wait
for the automatic synchronization (for
example, if your application is about
to exit) or if you want to update the
user defaults to what is on disk even
though you have not made any changes.

http://developer.apple.com/mac/library/documentation/Cocoa/Reference/Foundation/Classes/NSUserDefaults_Class/Reference/Reference.html#//apple_ref/doc/uid/20000318-CIHDDEGI