issue while using switch

Question

I have two view controllers and nibs. I populated one view controller with a toggle switch and declared this in its header file:

@public UISwitch *toggleSwitch;

and exposed it as a property like this:

@property (nonatomic,retain) IBOutlet UISwitch *toggleSwitch;

I also connected the switch with toggleSwitch outlet. Then I used this switch in my other view controller like this :

theViewControllerWhereIDeclaredTheSwitch.toggleSwitch.on = YES;

Though everything worked fine with the switch being ON by default but when I switched off the switch it threw an exception: "Thread 1: signal SIGABRT" in the main.m file. I get this error quite often while working with Xcode, this error is a real pain in my ass. Please help.

You are probably having some issues because objects have been released already. It also makes not much sense to let viewcontroller-2 change the state of the views belonging to viewcontroller-1, this defeats the purpose of having separate view controllers. You probably want to tell viewcontroller-1 only about logical program state (using some kind of a model) and let viewcontroller-1 figure out if it should toggle the switch when it's view gets loaded again. — Frank
– Frank, Commented Jul 13, 2012 at 7:42

werner · Accepted Answer · 2012-07-13 07:41:01Z

You should not share UI elements over multiple UIViewControllers.

A better approach would be to share a BOOL or even encapsulate the state in your own object inheriting from NSObject and pass that between the 2 UIViewControllers.

fBourgeois · Accepted Answer · 2012-07-13 08:11:29Z

@werner is right.

When programming a Controller and a View associated, you are implementing the NVC Pattern. The idea is that you have this Controller object that is the brain between a View and a Model that holds datas. Hence what you should perform in your application is not share the switch state but update a BOOL value in your Model when triggering the switch and share the Model with the two Controllers in order to know the value in the two Controllers.

(CF: wikipedia)

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