Core Data does not update

问题

This is the sequence of steps I have taken:

• Load data into table view
• add new data
• click to see more details on cells
• load the details
• edit details
• press save
• back to table view
• everything is fine
• re-open the application
• nothing updated

I had this problem also with sqlite, and I didn't fix it. No, I am also stacked with CoreData.

-(IBAction)save:(id)sender
{
    [passwords setValue:nametxt.text forKey:@"name"];

    [passwords setValue:usernametxt.text forKey:@"username"];


}

-(void) viewWillAppear:(BOOL)animated
{
    self.title = passwords.name;

    nametxt.text = passwords.name;
    usernametxt.text = passwords.username;

}

回答1:

You need to call save method of your NSManagedObjectContext.

NSError *error = nil;
[managedObjectContext save:&error];
if (error) {
//inform user
}

来源：https://stackoverflow.com/questions/10868602/core-data-does-not-update