Connecting Touch Up Inside event to File's Owner - ios5

Question

I’m working through the Multiview Applications chapter of Apress’s Beginning iOS5 development and ran into an issue making a connection from a button on one of the views to File Owner. The general premise of the program is to use a root controller, BIDSwitchViewController to switch between two content views BIDBlueViewController and BIDYellowViewController. Each of the content views has a single button connecting the Touch Up Inside event to the File’s Owner. I had no problem making the connection in BIDBlueViewController, but when I attempt to make this connection in the BIDYellowViewController I’m unable to make a connection between the Touch Up Inside event and the File’s Owner icon.
The instructions in the book state
Drag a Round Rect Button from the library over to the view, using the
guidelines to center the button in the view, both vertically and
horizontally. Double-click the button, and change its title to Press
Me. Next, with the button still selected, switch to the connections
inspector drag from the Touch Up Inside event to the
File's Owner icon, and connect to the blueButtonPressed action method
I’m able to do this without any issues, however when I try complete this instruction for the Yellow View
Drag a Round Rect Button from the library over to the view, using the
guidelines to center the button in the view, both vertically and
horizontally. Double-click the button, and change its title to Press
Me. Next, with the button still selected, switch to the connections
inspector drag from the Touch Up Inside event to the
File's Owner icon, and connect to the yellowButtonPressed action method
The File Owner icon will not let me make the connection, as I drag from the Touch Up Inside event to the File Owner icon File Owner never highlights and I cannot make the connection.
Here is my code
The root controller interface
//
// BIDSwitchViewController.h
// ViewSwitcher
//
//
#import <UIKit/UIKit.h>
#class BIDYellowViewController;
#class BIDBlueViewController;
#interface BIDSwitchViewController : UIViewController
#property (strong, nonatomic) BIDYellowViewController *yellowViewController;
#property (strong, nonatomic) BIDBlueViewController *blueViewController;
- (IBAction)switchViews:(id)sender;
#end
The root controller implementation
//
// BIDSwitchViewController.m
// ViewSwitcher
//
#import "BIDSwitchViewController.h"
#import "BIDYellowViewController.h"
#import "BIDBlueViewController.h"
#implementation BIDSwitchViewController
#synthesize yellowViewController;
#synthesize blueViewController;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
self.blueViewController = [[BIDBlueViewController alloc]
initWithNibName:#"BlueView" bundle:nil];
[self.view insertSubview:self.blueViewController.view atIndex:0];
[super viewDidLoad];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (IBAction)switchViews:(id)sender{
if (self.yellowViewController.view.superview == nil){
if (self.yellowViewController == nil) {
self.yellowViewController =
[[BIDYellowViewController alloc] initWithNibName: #"YellowView"
bundle:nil];
}
[blueViewController.view removeFromSuperview];
[self.view insertSubview:self.yellowViewController.view atIndex:0];
} else {
if (self.blueViewController == nil){
self.blueViewController = [[BIDBlueViewController alloc] initWithNibName:#"BlueView"
bundle:nil];
}
[yellowViewController.view removeFromSuperview];
[self.view insertSubview:self.blueViewController.view atIndex: 0];
}
}
- (void) didReceiveMemoryWarning {
// Release the view if it doesn't have a super view
[super didReceiveMemoryWarning];
// Release any cached data, images, etc, that aren't in use
if (self.blueViewController.view.superview == nil){
self.blueViewController = nil;
} else {
self.yellowViewController = nil;
}
}
#end
The blue content view controller interface
//
// BIDSwitchViewController.h
// ViewSwitcher
//
#import <UIKit/UIKit.h>
#class BIDYellowViewController;
#class BIDBlueViewController;
#interface BIDSwitchViewController : UIViewController
#property (strong, nonatomic) BIDYellowViewController *yellowViewController;
#property (strong, nonatomic) BIDBlueViewController *blueViewController;
- (IBAction)switchViews:(id)sender;
#end
The blue content view controller implementation
//
// BIDBlueViewController.m
// ViewSwitcher
//
//
#import "BIDBlueViewController.h"
#interface BIDBlueViewController ()
#end
#implementation BIDBlueViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#end
The yellow content view controller interface
//
// BIDYellowViewController.h
// ViewSwitcher
//
#import <UIKit/UIKit.h>
#interface BIDYellowViewController : UIViewController
- (IBAction)yellowButtonPressed;
#end
The yellow content view controller implementation
//
// BIDYellowViewController.m
// ViewSwitcher
//
//
#import "BIDYellowViewController.h"
#interface BIDYellowViewController ()
#end
#implementation BIDYellowViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#end