Declaring objects from one xib to another in Xcode?

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!

is the second xib on the same story board? as in, both view controllers appear on the same storyboard screen, or is it a separate nib file that doesnt appear on the storyboard along with the viewcontroller? — Pochi, May 11 '12 at 00:30
@LuisOscar I am not using storyboard. In my Project folder, I have AppDelegate.h, AppDelegate.m, ViewController.xib, ViewnController.h, and ViewController.m. In my 2nd Folder for my 2nd xib, (I named it settings) settings.h, settings.m, and settings.xib what should I do. — Big Box Developer, May 11 '12 at 00:42

score 1 · Answer 1 · edited May 23 '17 at 11:48

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.

Declaring objects from one xib to another in Xcode?

1 Answers1