Question

I have been developing iphone applications for around 3months now and theres a few things that stump me and i don’t really have an idea how to work round them.

I have a navigation controller controlling the views in my application however every screen that is loaded, used then pushed back loses all the information as it seems to be reinstantiated… I believe this is a possible memory management issue?

But how to i create an app that navigates and retains all information in its views until the application is closed.

Thanks 🙂

Answer 1

Possible you didn’t keep a reference to the view controller, the issue is for UIVIewController not to be released.

Make the view controller an ivar you will instanciate only one time when you push it on stack.

// in .h
MyViewController *mVC;

// in .m
// maybe when the user selects a row in a tableview
if(mVC == nil) {
    // first time use, alloc/init
    mVC = [[MyViewController ....];
}
// then push on the stack
[self.navigationController ....];

Of course don’t forget to release it later.