Main View Controller

Question

I'm having problem with my ViewControllers . There are Four of them. Here is the sequence of them. Sorry for the naming of my Views this is just an example.

---

startViewController ------> menuViewController ------> C1ViewController
                                          \
                                           \ ------> ImportantViewController

---

startViewController is my intro screen, after its finish, it will [self presentViewController:vc animated:YES completion:NULL]; into my menuViewController .

In my menuViewController are buttons for the two ViewController like the above illustration. Also I presented them in the View with this: [self presentViewController:vc animated:YES completion:NULL]; i return to menuViewController with this [self dismissModalViewControllerAnimated:YES];

What I wanted is to retain ImportantViewController to be the MainViewController-like even if I go to other Views. I dont know if it can be done in ViewController,but to be not removeFromSuperView or just put it Behind all of the other ViewControllers. Is it possible? And How?

Thanks.

Answer 1

Create a property in your MenuViewController.h file, like so...

#import "ImportantViewController.h"

@property (nonatomic, strong) ImportantViewController *importantViewController;

The key is making the property strong, which means your menuViewController will keep a reference to your importantViewController AND increment the retain count behind the scenes.

In your view did load (or anywhere, really), you can setup your ImportantViewController...

@syntheseize importantViewController;


- (void)viewDidLoad
{
     self.importantViewController = [[ImportantViewController alloc] init];
}

Then when you're ready to present it, do it like so:

[self presentViewController:importantViewController Animated:YES];

Then when you eventually dismiss it, your menuViewController will still have a reference to it and it will not be deallocated. You can then show the same controller again later.

Note: This is all assuming you are using Automatic Reference Counting (ARC).

Answer 2

Have importantViewController be the starting view controller, and present all of the other views modally. When you want to switch views, call the dismissModalViewControllerAnimated method and then present a new one. This will work if you have textfields or something that you want to be able to keep the information entered in them without saving/loading it every time you show the view.

//Inside all view controllers aside from the important one

    [self dismissModalViewControllerAnimated:YES];

To show a new controller, either make a modal segue to it and call it from important view controller or programmatically call it.