Adding Subviews on the top of MainViewController - ios

Question

I am working to get user survey before user starts using my app, it is a typically collection of data for my research.
My problem is to add subview on the top of mainviewcontroller.
I have two subviewcontroller as you can see in the first screenshoots. I would like to add first subview on the mainviewcontroller, and whenever user clicks on next customized button, then firstsubview disappear and secondsubview appear on the top of mainviewcontroller.
firstsubview implemented as follows:
CGRect rect = [firstSurveyViewController.view frame];
rect.origin.x = 5;
rect.origin.y = 5;
[firstSurveyViewController.view setFrame:rect];
[self.view addSubview:firstSurveyViewController.view];
But I want to drop the firstsubview and add the second when user clicks on next button.
How could I implement?

Answer 1

For composing modal view controllers, you have two real options (ignoring cool stuff under NDA):
Use the Container View Controller pattern to insert the inner view controller into its parent.
Add a new window with that view controller, similar to how you would do it in your AppDelegate. Create the window, add your child as a root view controller, make it key and visible. This is actually what UIAlertView does to perform a similar behavior to your app.
I can't say what would be better for your case, but I have more experience with container view controllers so I'll give you the highlights. To add a child view you will need these steps (from the link above) in your parent view controller:
- (void) displayContentController: (UIViewController*) content;
{
[self addChildViewController:content]; // 1
content.view.frame = [self frameForContentController]; // 2
[self.view addSubview:self.currentClientView]; // 3
[content didMoveToParentViewController:self]; // 4
}
This will:
Add your child view controller.
Set the frame to whatever you want. This could be self.view.bounds if you want it to take up the full space.
Add the view to its parent.
Notify the child view controller that it was added.
To remove a child view controller you would do the opposite, again from the link:
- (void) hideContentController: (UIViewController*) content
{
[content willMoveToParentViewController:nil]; // 1
[content.view removeFromSuperview]; // 2
[content removeFromParentViewController]; // 3
}
This will:
Notify your child view controller that it will disappear.
Remove its view from the visual stack.
Remove it from its parent.

Answer 2

You have got two options.
Use both controllers as modal controllers. After tapping Next on first controller, dismiss it and call second controller modally.
Another much better option (in my opinion) is to present these two series of controllers one after another using modal UINavigationController. You can push your controllers in navigation controller, and when done, you can dismiss it and show your main controller.
EDIT
See this post.

Answer 3

Transitioning between views is easy-
1) Straight forward
-(IBAction):onNextButtonClick:(id)sender
{
[self.firstViewController.view removeFromSuperView];
self.secondViewController.view.frame = newFrame;
[self.view addSubView:self.secondViewController.view];
}
2) If you want some fancy animations try this-
[UIView animateWithDuration:1.0 delay:0.0 options:UIViewAnimationOptionTransitionCurlDown animations:^{
[self.firstViewController.view removeFromSuperView];
self.secondViewController.view.frame = newFrame;
[self.view addSubView:self.secondViewController.view];
} completion:^(BOOL finished) {
//Completion
}];