UIViewController Transition - objective-c

If you are in the iOS 5 world and want to jump between different view controllers, you may need to view the controller limit . Or log in to WWDC 2011 Session 102 .

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Update:

, , . , . , viewDidLoad :

- (void)viewDidLoad
{
    [super viewDidLoad];

    // this is my model, where I store data used by my view controllers

    _model = [[MyModel alloc] init];

    // let create our first view controller

    OneViewController *controller = [[OneViewController  alloc] initWithNibName:@"OneViewController"  bundle:nil];

    // pass it our model (obviously, `model` is a property that I've set up in my child controllers)

    controller.model = _model;

    // let put the new child in our container and add it to the view

    [self addChildViewController:controller];
    [self configureChild:controller];
    [self.view addSubview:controller.view];
    [controller didMoveToParentViewController:self];

    // update our navigation bar title and the label of the button accordingly

    [self updateTitles:controller];
}

configureChild . UIView, IB ( childView), , , :

- (void)configureChild:(UIViewController *)controller
{
    // configure it to be the right size (I create a childView in IB that is convenient for setting the size of the views of our child view controllers)

    controller.view.frame = self.childView.frame;
}

, . , . , :

- (IBAction)barButtonTouchUpInside:(id)sender 
{
    UIViewController *currentChildController = [self.childViewControllers objectAtIndex:0];

    if ([currentChildController isKindOfClass:[OneViewController class]])
    {
        TwoViewController *newChildController = [[TwoViewController alloc] initWithNibName:@"TwoViewController"  bundle:nil];
        newChildController.model = _model;
        [self transitionFrom:currentChildController To:newChildController];
    }
    else if ([currentChildController isKindOfClass:[TwoViewController class]])
    {
        OneViewController *newChildController = [[OneViewController alloc] initWithNibName:@"OneViewController"  bundle:nil];
        newChildController.model = _model;
        [self transitionFrom:currentChildController To:newChildController];
    }
    else
        NSAssert(FALSE, @"Unknown controller type");

}

( , ):

- (void)transitionFrom:(UIViewController *)oldController To:(UIViewController *)newController
{    
    [self addChildViewController:newController];
    [self configureChild:newController];

    [self transitionFromViewController:oldController 
                      toViewController:newController
                              duration:0.5
                               options:UIViewAnimationOptionTransitionCrossDissolve
                            animations:^{
                                [self updateTitles:newController];
                            }
                            completion:^(BOOL finished){
                                [oldController willMoveToParentViewController:nil];
                                [oldController removeFromParentViewController];
                                [newController didMoveToParentViewController:self];
                            }];
}

, . .

- (void)updateTitles:(UIViewController *)controller
{
    if ([controller isKindOfClass:[OneViewController class]])
    {
        self.navigationItemTitle.title = @"First View Controller";  // current title
        self.barButton.title = @"Two";                              // title of button to take me to next controller
    }
    else if ([controller isKindOfClass:[TwoViewController class]])
    {
        self.navigationItemTitle.title = @"Second View Controller"; // current title
        self.barButton.title = @"One";                              // title of button to take me to next controller
    }
    else
        NSAssert(FALSE, @"Unknown controller type");
}

, . , , , .

, " UIViews": , ,

- (void)viewDidLoad
{
    [super viewDidLoad];

    // this is my model, where I store data used by my view controllers

    _model = [[MyModel alloc] init];

    // let create our first view controller

    _controller0 = [[OneViewController  alloc] initWithNibName:@"OneViewController"  bundle:nil];
    _controller0.model = _model;
    [self addChildViewController:_controller0];
    [self configureChild:_controller0];
    [_controller0 didMoveToParentViewController:self];

    // let create our second view controller

    _controller1 = [[OneViewController  alloc] initWithNibName:@"OneViewController"  bundle:nil];
    _controller1.model = _model;
    [self addChildViewController:_controller1];
    [self configureChild:_controller1];
    [_controller1 didMoveToParentViewController:self];

    // let add the first view and update our navigation bar title and the label of the button accordingly

    _currentChildController = _controller0;
    [self.view addSubview:_currentChildController.view];
    [self updateTitles:_currentChildController];
}

- (void)transitionFrom:(UIViewController *)oldController To:(UIViewController *)newController
{    
    [self transitionFromViewController:oldController 
                      toViewController:newController
                              duration:0.5
                               options:UIViewAnimationOptionTransitionCrossDissolve
                            animations:^{
                                [self updateTitles:newController];
                            }
                            completion:^(BOOL finished){
                                _currentChildController = newController;
                            }];
}

- (IBAction)barButtonTouchUpInside:(id)sender 
{
    UIViewController *newChildController;

    if ([_currentChildController isKindOfClass:[OneViewController class]])
    {
        newChildController = _controller1;
    }
    else if ([_currentChildController isKindOfClass:[TwoViewController class]])
    {
        newChildController = _controller0;
    }
    else
        NSAssert(FALSE, @"Unknown controller type");

    [self transitionFrom:_currentChildController To:newChildController];

}

, , .