titleView jumps after segue - ios

Question

In my app I have a UINavigationController with a UISplitViewController as rootViewController. The masterViewController of this UISplitViewController sets a UIView with a UITextField centered inside it as titleView. This is wat it looks like in the storyboard.
- (void)viewDidLoad {
[super viewDidLoad];
self.titleView = [[UIView alloc] initWithFrame:CGRectMake((self.view.frame.size.width-((self.view.frame.size.width/2)+150))/2, 0, (self.view.frame.size.width/2)+150, 30)];
self.rightButton = [[UIButton alloc] init];
[self.rightButton setImage:newImage forState:UIControlStateNormal];
[self.rightButton addTarget:self action:#selector(barButtonRight:) forControlEvents:UIControlEventTouchUpInside];
self.rightButton.frame = CGRectMake(0, 0, 30, 30);
self.rightButton.tintColor = [UIColor whiteColor];
[self.rightButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithCustomView:self.rightButton];
self.splitViewController.navigationItem.rightBarButtonItem = rightButton;
self.textField = [[UITextField alloc]init];
if (IDIOM == IPAD) {
self.textField.frame = CGRectMake(0, 0, self.titleView.frame.size.width, 30);
} else {
self.textField.frame = CGRectMake(65, 0, (self.view.frame.size.width-20)-110, 30);
}
self.textField.backgroundColor = [UIColor purpleColor];
if (IDIOM == IPAD) {
UIView *paddingView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 15, 20)];
self.textField.leftView = paddingView;
self.textField.leftViewMode = UITextFieldViewModeAlways;
}
[self.titleView addSubview:self.textField];
self.splitViewController.navigationItem.titleView = self.titleView;
[self.navigationController setNavigationBarHidden:YES animated:NO];
}
Now, when a the right button is pressed a strange thing happens.
- (IBAction)barButtonRight:(id)sender {
[self performSegueWithIdentifier:#"showDetail" sender:self];
}
The UITextField is pushed all the way to the left inside the UIView. I commented out most of my viewDidLoad code and this is still happening. Any ideas as to what's causing this?