Help me to understand the answer given - iphone

Question

I have problem with UIModalTransitionStylePartialCurl when i rotate the device beacuse the curl is not rotating as i expected and i found the below extract of the answer but i am not able to undertsand.
i am not sure how to create a "rootviewcontroller" Property as told like below
So i am looking for your guidence to proceed further .I am really stuck with this thing for long days...
Thanks for any help:-
The SOURCE CODE I HAVE
//
// ModalViewExampleViewController.h
// ModalViewExample
//
// Created by Tim Neill on 11/09/10.
//
#import <UIKit/UIKit.h>
#interface ModalViewExampleViewController : UIViewController {
UIButton *showDefaultButton, *showFlipButton, *showDissolveButton, *showCurlButton;
}
#property (nonatomic, retain) IBOutlet UIButton *showDefaultButton, *showFlipButton, *showDissolveButton, *showCurlButton;
- (IBAction)showDefault:(id)sender;
- (IBAction)showFlip:(id)sender;
- (IBAction)showDissolve:(id)sender;
- (IBAction)showCurl:(id)sender;
#end
//
// ModalViewExampleViewController.m
// ModalViewExample
//
// Created by Tim Neill on 11/09/10.
//
#import "ModalViewExampleViewController.h"
#import "SampleViewController.h"
#implementation ModalViewExampleViewController
#synthesize showDefaultButton, showFlipButton, showDissolveButton, showCurlButton;
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
- (void)viewDidUnload {
[super viewDidUnload];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES;
}
- (IBAction)showDefault:(id)sender {
SampleViewController *sampleView = [[[SampleViewController alloc] init] autorelease];
[self presentModalViewController:sampleView animated:YES];
}
- (IBAction)showFlip:(id)sender {
SampleViewController *sampleView = [[[SampleViewController alloc] init] autorelease];
[sampleView setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];
[self presentModalViewController:sampleView animated:YES];
}
- (IBAction)showDissolve:(id)sender {
SampleViewController *sampleView = [[[SampleViewController alloc] init] autorelease];
[sampleView setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
[self presentModalViewController:sampleView animated:YES];
}
- (IBAction)showCurl:(id)sender {
SampleViewController *sampleView = [[[SampleViewController alloc] init] autorelease];
sampleView.rootViewController = self;
[sampleView setModalTransitionStyle:UIModalTransitionStylePartialCurl];
[self presentModalViewController:sampleView animated:YES];
}
- (void)dealloc {
[showDefaultButton release];
[showFlipButton release];
[showDissolveButton release];
[showCurlButton release];
[super dealloc];
}
#end
//
// SampleViewController.h
// ModalViewExample
//
// Created by Tim Neill on 11/09/10.
//
#import <UIKit/UIKit.h>
#class RootViewController;
#interface SampleViewController : UIViewController {
RootViewController *rootViewController;
UIButton *dismissViewButton;
}
#property (nonatomic, retain) IBOutlet UIButton *dismissViewButton;
#property (nonatomic, retain) RootViewController *rootViewController;
- (IBAction)dismissView:(id)sender;
#end
//
// SampleViewController.m
// ModalViewExample
//
// Created by Tim Neill on 11/09/10.
//
#import "SampleViewController.h"
#implementation SampleViewController
#synthesize rootViewController;
#synthesize dismissViewButton;
- (IBAction)dismissView:(id)sender {
[self dismissModalViewControllerAnimated:YES];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
- (void)viewDidUnload {
[super viewDidUnload];
}
- (void)dealloc {
[dismissViewButton release];
[super dealloc];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
[self dismissModalViewControllerAnimated:YES];
return YES;
}
#end
UIView Animation: PartialCurl ...bug during rotate?
I too had this issue and somewhat gave up. However, I mentioned my
dilemma to a friend, who encouraged me to look into the child VC's
logic and I recalled a handy trick that I've used to pass data between
parent/child view controllers.
In your flipside view controller, create a "rootViewController"
property. In your parent view controller, when you initialize the
flipside view controller, you set (where "self" is the rootVC):
flipsideController.rootViewController = self;
You then use this for your flipside VC's
shouldAutorotateToInterfaceOrientation method:
-
(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{ return interfaceOrientation ==
self.rootViewController.interfaceOrientation;
}
Viola! The flipside view no longer rotates underneath the partially
curled up parent view!

Answer 1

#From the post : In your flipside view controller, create a "rootViewController" property.
#import <UIKit/UIKit.h>
#class ModalViewExampleViewController;
#interface flipSideViewController : UIViewController {
ModalViewExampleViewController *rootViewController;
}
#property (nonatomic, retain) ModalViewExampleViewController *rootViewController;
#end
and in your flipSideViewController's implementation file
#import "ModalViewExampleViewController.h"
#synthesize rootViewController;