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Passing Non-Static Objects Between View Controllers

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A:

If I've understood you correctly there is just one copies value and one price value in the whole app. If that is the case...

There are many ways to do this. Easiest way (perhaps): you could make a Singleton object of a class that you define that has copies and price as properties. Singleton in Objective-C is here, and you would define your properties within the Singleton class. Then you would just call its shared instance and use the values on that. So your code would look like this:

   [ThatCrazySingleton sharedInstance].copies = 5;

for writing.

Hope this is what you're looking for.

If you don't want to use a Singleton, at some point one of the UIViewControllers would need to send a message to the others with the copies and price values (hopefully wrapped up ["encapsulated"] in an object). This means that you have to get a reference to the other View controllers, which you can always do by going through the hierarchy.

Yar 2010-07-14 00:15:46

Thanks for the quick response. Yes, there is just one common object of "copies", but the value is a user input. So, I couldn't hard code it to be say, "5".It sounds like messaging may be the way to go. Do you have any references/sample code I could look at to learn more?

2010-07-14 01:20:24

It's no problem that the value is user input. You would set it on, say, a touchUpInside of a button (so the could would be `[ThatCrazySingleton sharedInstance].copies = myTextField.text;`) the TextField would be hooked up to an IBOutlet. But you should probably go back and do some basic tutorials, and then most of this might make sense.

Yar 2010-07-14 01:25:39

Here's the problem I can't get past then.This the class where I have the singleton setMyManager.hMyManager.mThis is the class where the user inputs the "copies" UITextViewSixthViewController.hSixthViewController.mThis is where I need the copies value to show.SeventhViewController.hSeventhViewController.mSo, I would have to create a button on #6 to set a value in MyManager. It didn't work for me. If you can elaborate on what tutorials your talking about that may help.

2010-07-14 03:39:10

I really recommend the LeMarche (Apress) beginning iphone dev book to get your started.

Yar 2010-07-14 03:58:09

Thanks for the reference. I bought the book and will give it a good read. In the meantime I'm going to keep tinkering.

2010-07-14 13:23:33

Okay, best of luck.

Yar 2010-07-14 18:31:29

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