gistfile1.txt

//
//  FRCTheParentViewController.m
//  VCDemo
//
//  Created by Matthew Wilkinson on 11/06/2013.
//  Copyright (c) 2013 FreshCocoa. All rights reserved.
//

#import "FRCTheParentViewController.h"

@protocol FRCFirstChildProtocol <NSObject>

- (void)didTapClose;

@end

@interface FRCTheFirstChildViewController : UIViewController

@property (nonatomic, weak) id<FRCFirstChildProtocol> delegate;

@end

@implementation FRCTheFirstChildViewController
@end

@interface FRCTheSecondChildViewController : UIViewController
@end

@implementation FRCTheSecondChildViewController
@end

@interface FRCTheParentViewController () <FRCFirstChildProtocol>

@property (nonatomic) UIView* contentView;

@property (nonatomic) FRCTheFirstChildViewController* firstVC;
@property (nonatomic) FRCTheSecondChildViewController* secondVC;

@end

@implementation FRCTheParentViewController

- (void)didTapClose
{
    [self.firstVC.view removeFromSuperview];
    [self.firstVC didMoveToParentViewController:nil];
    
    [self.contentView addSubview:self.secondVC.view];
    [self.secondVC didMoveToParentViewController:self];
}


- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.contentView = [[UIView alloc] initWithFrame:self.view.bounds];
    [self.contentView addSubview:self.contentView];
    
    FRCTheFirstChildViewController* first = [[FRCTheFirstChildViewController alloc] init];
    self.firstVC = first;
    first.delegate = self;
    [self addChildViewController:first];
    
    FRCTheSecondChildViewController* second = [[FRCTheSecondChildViewController alloc] init];
    self.secondVC = second;
    [self addChildViewController:second];
    
    [self.contentView addSubview:first.view];
    [first didMoveToParentViewController:self];
    
}

@end