View Transitioning

Question

I'm new to Objective-C programming and I'm having a little trouble understanding how I transition between two views.

Basically, I have my main view (the view that loads up when the application opens) and I want to transition to a new view on pressing a button. The user will not need to go back to the main view after pressing the button -- it's basically a title screen.

Could someone please briefly explain the steps I would need to take to make this happen?

Thanks a lot.

Answer 1

You could make use of UIView's class method transitionFromView:toView:duration:options:completion: . A call to switch from viewA to viewB could look like this:

[UIView transitionFromView:viewA 
                    toView:viewB 
                  duration:1.0 
                   options:UIViewAnimationOptionTransitionFlipFromLeft 
                completion:^(BOOL finished){
                    [viewA release];
                }];

As you mentioned the user won't get back to the mainView I added something to the completion parameter to get rid of viewA afterwards.

You can find the animation options in the constants of the UIView class documentation.

Answer 2

If you don't just want to copy & paste the code you should follow Apple's sample code step by step and remember you can download it:

ViewTransitions sample application

The ViewTransitions sample application demonstrates how to perform transitions between two views using built-in Core Animation transitions. By looking at the code, you'll see how to use a CATransition object to set up and control transitions.

Answer 3

If it's going to be a modal view, you can push on a new modal view controller which will then later be popped off when work is complete. These are usually intended for small amounts of work

[container presentModalViewController:yourNavigationViewController animated:YES];

Otherwise you can modify the UIView stack using the two UIView transition class methods:

+ transitionWithView:duration:options:animations:completion:
+ transitionFromView:toView:duration:options:completion:

For more info on these check out Apple's UIView class docs.