iOS Display 'Loading' message before view change

Question

I'm pretty new at this IOS objective C stuff so hopefully this is an easy one.

I have a rightBarButtonItem that when pressed uses a push segue to move to the next view. However, loading that next view takes a while because it involves a database call. I would like the button to change a UILabel (or otherwise alter the UI) to display a message indicating that it is working.

I've tried doing things in the prepareForSegue method, but those changes only take place right before the view changes, if at all.

How should I accomplish what I'm looking for? Thanks.

Answer 1

I suggest you to MBProgressHUD , which puts a nice modal indicator up. It was dead easy to implement.

Take a look this github demo and use into your project. And i also suggest you For better performing that for process Load Data from DataBase Method in Background using Grand Central Dispatch (GCD) as per your Method:-

for Example in you ViewDidLoad Method:-

[MBProgressHUD showHUDAddedTo:self.view animated:YES];  //Activity Indicator loading

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

           [self LoadDatabae]; //database data fatch method

            dispatch_async(dispatch_get_main_queue(), ^{

                [MBProgressHUD hideHUDForView:self.view animated:YES]; //hide that after your Dela Loading finished fromDatabase
            });
        });

Answer 2

You should display the loader in any of the following method of Secondviewcontroller.(Where database is called).

- (void)viewWillAppear:(BOOL)animated

or

 - (void)viewDidAppear:(BOOL)animated 

Edit : I was typing to suggest MBProgressHUD . Thanks for Nitin Gohel.