2.3 Custom Container View Controller

UINavigationController Class Reference | View Controller Programming Guide for iOS

iOS 5 から UIViewController の property に childViewControllers が追加され、UINavigationController や UITabBarController のようなコンテナを自作できるようになりました。

UIViewController の view を addSubView するだけでは呼び出されない以下のメソッドが適切に呼び出される点が利点です。

• viewWillAppear:
• viewDidAppear:
• viewWillDisappear:
• viewDidDisappear:
• willRotateToInterfaceOrientation:duration:
• willAnimateRotationToInterfaceOrientation:duration:
• didRotateFromInterfaceOrientation:

自作コンテナを作ってみましょう

MixiViewController.m

#import "MixiViewController.h"
#import "MixiFirstViewController.h"
#import "MixiSecondViewController.h"

@interface MixiViewController ()

@property (weak, nonatomic) IBOutlet UIView *dummyView;
- (IBAction)pressFirstButton:(id)sender;
- (IBAction)pressSecondButton:(id)sender;
@end

@implementation MixiViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.

    MixiFirstViewController *fvc = [[MixiFirstViewController alloc] init];
    [self addChildViewController:fvc];
    fvc.view.frame = _dummyView.frame;
    [self.view addSubview:fvc.view];
    [fvc didMoveToParentViewController:self];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(void)transitionFromViewController:(UIViewController *)fromViewController
                   toViewController:(UIViewController *)toViewController
{
    [fromViewController willMoveToParentViewController:nil];
    [self addChildViewController:toViewController];

    toViewController.view.frame = CGRectMake(0, -_dummyView.frame.size.height, _dummyView.frame.size.width, _dummyView.frame.size.height);

    [self transitionFromViewController:fromViewController
                      toViewController:toViewController
                              duration:0.5
                               options:0
                            animations:^{
                                toViewController.view.frame = fromViewController.view.frame;
                                fromViewController.view.frame = CGRectMake(0, 50, _dummyView.frame.size.width, _dummyView.frame.size.height);
                            } completion:^(BOOL finished) {
                                [fromViewController removeFromParentViewController];
                                [toViewController didMoveToParentViewController:self];
                            }];
}


- (IBAction)pressFirstButton:(id)sender
{
    UIViewController *currentVC = self.childViewControllers[0];
    MixiFirstViewController *newVC = [[MixiFirstViewController alloc] init];
    [self transitionFromViewController:currentVC toViewController:newVC];
}

- (IBAction)pressSecondButton:(id)sender
{
    UIViewController *currentVC = self.childViewControllers[0];
    MixiSecondViewController *newVC = [[MixiSecondViewController alloc] init];
    [self transitionFromViewController:currentVC toViewController:newVC];
}

@end

MixiViewController.xib