Help need for proper use of Navigation Controller

[applelim08]

I'm newbie in iPhone development, I need to do a form submission (multiple pages, each page will be a single ViewController). So what I did was navigate each pages through Navigation Controller... here is some illustration:

page 1 (have 'next' button)
page 2 (have 'next' and 'back' button)
page 3 (have 'next' and 'back' button)
page 4 (have 'next' and 'back' button)
page 5 (have 'next' and 'back' button)
page 6 (have 'done' button)

so when from page 1 to page 2, i am using pushViewController,
similiar from page 2 to page 3 etc

similiarly from page 2 back to page 1, i am using popViewController.

if click on 'done' button on page 6, it should back to page 1, i am using popToRootViewController

There's strange things happened if I navigate the pages around, e.g. page 1 to 2, then 2 to 3, then 3 back to 2, then 2 to 3 again etc etc
1st, I notice the memory usage go higher and higher
2nd, sometime the program just crash when i navigate arround, seem not stable at all. (not sure is cause by memory usage or not, but i notice the memory climb around 2MB)

i also try to use popToViewController, so i can from page 5 jump back to page 2, but seem not stable as well, not everytime success...

my actual work is include quite number of Views,
i using a TabController to navigate around 5 different NavigationController and each Navigation Controller having 5~6 views.

I really need some help to really understand the navigation controller, especially what is the proper way to navigate around different views in more effective way.

Really appreciate for any help!!! Thank you!!

[inlvrwetrst]

I notice the memory usage go higher and higher

Make sure you that after you invoke pushViewController: you are releasing the view you just pushed onto the navigation stack.

Also, if you are using a navigation controller, you do not have to implement the back functionality. It is already implemented for you.

I think the instability is probably stemming from not handling references to the view properly. If you post some code for us to look at, we could probably help.

[applelim08]

Originally Posted by inlvrwetrst

Make sure you that after you invoke pushViewController: you are releasing the view you just pushed onto the navigation stack.

Also, if you are using a navigation controller, you do not have to implement the back functionality. It is already implemented for you.

I think the instability is probably stemming from not handling references to the view properly. If you post some code for us to look at, we could probably help.

Thanks for the answer, the codes are quite messy and need to simplify quite a bit before i can post here~ Let me see what can i do....

I knew there's back function in navigation, and it appear at the upper left as 'back' button, but i need this button display on the bottom of the screen (just next to the 'Next' button), is that anyway to do so? And do you know how the navigation controller's back function work? is that same as popViewController??

Thanks for help again!!

[inlvrwetrst]

You can hide the back button by putting something this in the viewDidLoad method inw hatever view you want to hide it.

self.navigationItem.hidesBackButton = YES;

Then just have a function in your .h like back: or something, connect it to a control in the view, and use popViewController in that function.

And yes, the back functionality does pop the current view off the navigation stack.