Objective-C: How can i access another ViewController and change UI in it? - objective-c

Question

I'm trying to navigate to another view and change its UI.
I manage to access to the controller method "hideElements",
but all the elements are "NIL" and it doesnt change anything.
(When i access the ViewController.m regular with no navigation then the properties are not NIL)
Why is that and How can i solve it?
ViewController.m:
- (void)hideElements:(NSString *)identifier{
[_agreeButton setHidden:TRUE];
[_noThankButton setHidden:TRUE];
[self cleanButtons];
}
ViewController2.h
#import "ViewController.h"
#property (nonatomic) ViewController *myViewController;
ViewController2.m
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
NSString *identifire = [sender text];
ViewController* vc = (ViewController*)segue.destinationViewController;
[vc hideElements:identifire];
}
ScreenShot:

Answer 1

It seems that the problem is the view controller's view (and subviews including outlets) haven't been created by the time you are calling hideElements. So you can do a couple of things
1)
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
NSString *identifire = [sender text];
ViewController* vc = (ViewController*)segue.destinationViewController;
vc.view;
[vc hideElements:identifire];
}
2)
ViewController2.m
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
NSString *identifire = [sender text];
ViewController* vc = (ViewController*)segue.destinationViewController;
vc.shouldHideElements = YES;
}
ViewController.m
- (void)viewDidLoad {
if (self.shouldHideElements) {
[self hideElements];
}
}