Question

I have this code:

ViewController .h

@property IBOutlet UITextField *field;

ViewController .m

@synthesize field;

ViewControllerTwo .h

#import "ViewController.h" 
{
ViewController *ViewCont;
}
-(IBAction)changeTextField

ViewControllerTwo .m

#import "ViewController.h"

-(IBAction)changeTextField{
   viewCont.field.text = @"hello";
}

The problem is that it doesn’t work, although it doesn’t give me any error. Does anyone know what I’m doing wrong?

Answer 1

Never modify another view controller’s views. You are encountering one of many problems doing that. In your case, the likely cause is that the other view controller has not yet loaded its view, so all the IBOutlets are still nil.

You’re breaking MVC, and that’s going to cause lots of little problems like this. Instead of having ViewControllerTwo modify the outlets of ViewController, you should move the data (@"hello") into a model object that is shared by both view controllers. ViewControllerTwo would write to it, and ViewController would read from it. You can share that model object by passing it to the view controllers as a property, or by making the model a singleton.