Declaring objects from one xib to another in Xcode? - objective-c

Question

I have a project that has a switch from an xib separate from the main ViewController. I am trying to make it so that when you switch the UISwitch to OFF a button in the ViewController is hidden. I have tried to declare the AppDelegate in the xib's .m file but still no luck. My code is:
- (void)viewDidAppear:(BOOL)animated {
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
}
What am I doing wrong? I am trying to do
if (switch.on) {
myButton.hidden = YES;
} else {
myButton.hidden = NO;
}
I have also done this in the .m file of the second xib (the one that does not have the main ViewController)
#import "AppDelegate.h"
#import "ViewController.h"
But still NOTHING! So basically, I'm just trying to declare a button in one xib from another. THAT'S IT. PLEASE HELP Thanks!

Answer 1

First, see this about passing data between view controllers and this about UISwitch.
Once you understand that, set up your code something like this--
FirstViewController.h:
#interface FirstViewController : UIViewController
{
...
}
#property IBOutlet UISwitch *theSwitch;
- (IBAction)switchToggled;
#end
SecondViewController.h:
#interface SecondViewController : UIViewController
{
...
}
#property IBOutlet UIButton *button;
#property UIViewController *theFirstViewController;
#end
Be sure that theFirstViewController gets set somehow -- again, see passing data between view controllers. Then in switchToggled you can do this:
- (IBAction)switchToggled
{
theFirstViewController.button.hidden = YES;
}
The important thing to remember is that your view controllers don't magically know about each other. Even if you do something with the AppDelegate like you were trying. SecondViewController needs a reference to FirstViewController.