Switching using Storyboard, Auto-layout or not, a Button of some sort, and a series of Child View Controllers
You want to add the container view to your view and when the buttons that 'switch' child view controllers are pressed fire off the appropriate segue and perform the correct setup work.
In the Storyboard you can only connect one Embed Segue to the Container View. So you create an intermediate handling controller. Make the embed segue and give it an identifier, for example EmbededSegueIdentifier.
In your parent view controller wire up the button or whatever you want and keep are reference to your child view controller in the prepare segue. As soon as the parent view controller loads the segue will be fired.
The Parent View Controller
@property (weak, nonatomic) MyContainerViewController *myContainerViewController;
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:@"EmbeddedSegueIdentifier"]) {
self.myContainerViewController = segue.destinationViewController;
}
}
It should be fairly easy for you to delegate to your container controller the button presses.
The Container Controller
This next bit of code was partly borrowed from a couple of sources, but the key change is that auto layout is being used as opposed to explicit frames. There is nothing preventing you from simply changing out the lines [self addConstraintsForViewController:] for viewController.view.frame = self.view.bounds. In the Storyboard this Container View Controller doesn't do anything more that segue to the destination child view controllers.
- (void)viewDidLoad
{
[super viewDidLoad];
NSLog(@"%s", __PRETTY_FUNCTION__);
[self performSegueWithIdentifier:@"FirstViewControllerSegue" sender:nil];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
UIViewController *destinationViewController = segue.destinationViewController;
if ([self.childViewControllers count] > 0) {
UIViewController *fromViewController = [self.childViewControllers firstObject];
[self swapFromViewController:fromViewController toViewController:destinationViewController];
} else {
[self initializeChildViewController:destinationViewController];
}
}
- (void)initializeChildViewController:(UIViewController *)viewController
{
[self addChildViewController:viewController];
[self.view addSubview:viewController.view];
[self addConstraintsForViewController:viewController];
[viewController didMoveToParentViewController:self];
}
- (void)swapFromViewController:(UIViewController *)fromViewController toViewController:(UIViewController *)toViewController
{
[fromViewController willMoveToParentViewController:nil];
[self addChildViewController:toViewController];
[self transitionFromViewController:fromViewController toViewController:toViewController duration:0.2f options:UIViewAnimationOptionTransitionCrossDissolve animations:nil completion:^(BOOL finished) {
[self addConstraintsForViewController:toViewController];
[fromViewController removeFromParentViewController];
[toViewController didMoveToParentViewController:self];
}];
}
- (void)addConstraintsForViewController:(UIViewController *)viewController
{
UIView *containerView = self.view;
UIView *childView = viewController.view;
[childView setTranslatesAutoresizingMaskIntoConstraints:NO];
[containerView addSubview:childView];
NSDictionary *views = NSDictionaryOfVariableBindings(childView);
[containerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[childView]|"
options:0
metrics:nil
views:views]];
[containerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[childView]|"
options:0
metrics:nil
views:views]];
}
#pragma mark - Setters
- (void)setSelectedControl:(ViewControllerSelectionType)selectedControl
{
_selectedControl = selectedControl;
switch (self.selectedControl) {
case kFirstViewController:
[self performSegueWithIdentifier:@"FirstViewControllerSegue" sender:nil];
break;
case kSecondViewController:
[self performSegueWithIdentifier:@"SecondViewControllerSegue" sender:nil];
break;
default:
break;
}
}
The Custom Segues
The last thing you need is a custom segue that does nothing, going to each destination with the appropriate segue identifier that is called from the Container View Controller. If you don't put in an empty perform method the app will crash. Normally you could do some custom transition animation here.
@implementation SHCDummySegue
@interface SHCDummySegue : UIStoryboardSegue
@end
- (void)perform
{
// This space intentionally left blank
}
@end
