iPhone OS Utility App - Flipside View and Main Vie

Question

I am currently working on an iPhone 2.1 application. I am new to Objective C, coming from a Java background.

My application has as a base the Utility Application template available in Xcode with the iPhone SDK. Currently I have some controls, such as an UISlider and text box, in the FlipsideView. The UISlider already has a method which is being called when the value changes, using targets and selectors. However, I would also like to be able to read, from the MainView, the current (or last) value of the UISlider and textbox.

Keep in mind I am new to development on a Mac, and would appreciate any guidance as to where I should look up such information, be it through the use of delegates or perhaps I am missing something obvious in the structure of the template.

UPDATE: I am taking a look at the structure and have some more details: The UISlider is being created in FlipsideView.m. I noticed that the Done button is created from RootViewController.m and probably I should move the UISlider code over there. I may incorrectly be using the View to keep code that would be more appropiate in a Controller.

Answer 1

I'm in exactly the same situation: first iphone app, new to mac programming, creating a utility, sliders on the flipside.

By following the example and the free tutorial here (http://www.bestechvideos.com/2008/11/13/writing-iphone-app-free-episode) I determined that the sliders and other controls should be declared on the flipsideviewcontroller. (Which leave the view pretty empty - I guess the use of the Nib resource file for the UI leaves the ...View.m class pretty much redundant?)

Wisequark's answer is a bit to general to help me though. In terms of specifics: - I can't find that video is there a link? - Could we see some code showing the Controller-Model code? - How do I persist the values set on the slider without having to build UI to go in the system settings?

(BTW is an Answer the right place to add to the question?)

Answer 2

Ultimately you should be updating some underlying object with the values from the controller. In general, the slider belongs in the view layer - it's a display element. The action that adjusting the slider produces, however, is a component of the controller and it should fire back into your model to update a value. I highly recommend drawing boxes on a sheet of paper and trying to produce a clean a separation as possible for your application's layers - doing so in this case would produce two views for each "side" of the utility which would, via a controller, relate to a model. Then, the act of moving the slider would "instantly" update the model on the back. The Cocoa Fundamental video on the iPhone developer site demonstrates this to great effect.