/*

 Copyright (C) 2016 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 The initial view controller for the Swipe demo.

 */

#import "AAPLSwipeFirstViewController.h"

#import "AAPLSwipeTransitionDelegate.h"

@interface AAPLSwipeFirstViewController ()

@property (nonatomic, strong) AAPLSwipeTransitionDelegate *customTransitionDelegate;

@end

@implementation AAPLSwipeFirstViewController

//| ----------------------------------------------------------------------------

- (void)viewDidLoad

{

    [super viewDidLoad];

    // This gesture recognizer could be defined in the storyboard but is

    // instead created in code for clarity.

    UIScreenEdgePanGestureRecognizer *interactiveTransitionRecognizer;

    interactiveTransitionRecognizer = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(interactiveTransitionRecognizerAction:)];

    interactiveTransitionRecognizer.edges = UIRectEdgeRight;

    [self.view addGestureRecognizer:interactiveTransitionRecognizer];

}

//| ----------------------------------------------------------------------------

//! Action method for the interactiveTransitionRecognizer.

//

- (IBAction)interactiveTransitionRecognizerAction:(UIScreenEdgePanGestureRecognizer *)sender

{

    if (sender.state == UIGestureRecognizerStateBegan)

        [self performSegueWithIdentifier:@"CustomTransition" sender:sender];

    // Remaining cases are handled by the

    // AAPLSwipeTransitionInteractionController.

}

//| ----------------------------------------------------------------------------

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender

{

    if ([segue.identifier isEqualToString:@"CustomTransition"])

    {

        UIViewController *destinationViewController = segue.destinationViewController;

        // Unlike in the Cross Dissolve demo, we use a separate object as the

        // transition delegate rather then (our)self.  This promotes

        // 'separation of concerns' as AAPLSwipeTransitionDelegate will

        // handle pairing the correct animation controller and interaction

        // controller for the presentation.

        AAPLSwipeTransitionDelegate *transitionDelegate = self.customTransitionDelegate;

        // If this will be an interactive presentation, pass the gesture

        // recognizer along to our AAPLSwipeTransitionDelegate instance

        // so it can return the necessary

        // <UIViewControllerInteractiveTransitioning> for the presentation.

        if ([sender isKindOfClass:UIGestureRecognizer.class])

            transitionDelegate.gestureRecognizer = sender;

        else

            transitionDelegate.gestureRecognizer = nil;

        // Set the edge of the screen to present the incoming view controller

        // from.  This will match the edge we configured the

        // UIScreenEdgePanGestureRecognizer with previously.

        //

        // NOTE: We can not retrieve the value of our gesture recognizer's

        //       configured edges because prior to iOS 8.3

        //       UIScreenEdgePanGestureRecognizer would always return

        //       UIRectEdgeNone when querying its edges property.

        transitionDelegate.targetEdge = UIRectEdgeRight;

        // Note that the view controller does not hold a strong reference to

        // its transitioningDelegate.  If you instantiate a separate object

        // to be the transitioningDelegate, ensure that you hold a strong

        // reference to that object.

        destinationViewController.transitioningDelegate = transitionDelegate;

        // Setting the modalPresentationStyle to FullScreen enables the

        // <ContextTransitioning> to provide more accurate initial and final

        // frames of the participating view controllers.

        destinationViewController.modalPresentationStyle = UIModalPresentationFullScreen;

    }

}

//| ----------------------------------------------------------------------------

//  Custom implementation of the getter for the customTransitionDelegate

//  property.  Lazily creates an instance of AAPLSwipeTransitionDelegate.

//

- (AAPLSwipeTransitionDelegate *)customTransitionDelegate

{

    if (_customTransitionDelegate == nil)

        _customTransitionDelegate = [[AAPLSwipeTransitionDelegate alloc] init];

    return _customTransitionDelegate;

}

#pragma mark -

#pragma mark Unwind Actions

//| ----------------------------------------------------------------------------

//! Action for unwinding from AAPLSwipeSecondViewController.

//

- (IBAction)unwindToSwipeFirstViewController:(UIStoryboardSegue *)sender

{ }

@end