/*

 Copyright (C) 2014 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

  AAPLCoolAnimatedTransitioning and AAPLCoolTransitioningDelegate implementations.

 */

#import "AAPLCoolTransitioner.h"

#import "AAPLCoolPresentationController.h"

@implementation AAPLCoolTransitioningDelegate

- (UIPresentationController *)presentationControllerForPresentedViewController:(UIViewController *)presented presentingViewController:(UIViewController *)presenting sourceViewController:(UIViewController *)source

{

    // Provide our Cool presentation controller

    return [[AAPLCoolPresentationController alloc] initWithPresentedViewController:presented presentingViewController:presenting];

}

- (AAPLCoolAnimatedTransitioning *)animationController

{

    // Provide our Cool animation controller

    AAPLCoolAnimatedTransitioning *animationController = [[AAPLCoolAnimatedTransitioning alloc] init];

    return animationController;

}

- (id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source

{

    AAPLCoolAnimatedTransitioning *animationController = [self animationController];

    [animationController setIsPresentation:YES];

    return animationController;

}

- (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed

{

    AAPLCoolAnimatedTransitioning *animationController = [self animationController];

    [animationController setIsPresentation:NO];

    return animationController;

}

@end

@implementation AAPLCoolAnimatedTransitioning

- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext

{

    return 0.5;

}

- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext

{

    UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];

    UIView *fromView = [fromVC view];

    UIViewController *toVC   = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];

    UIView *toView = [toVC view];

    UIView *containerView = [transitionContext containerView];

    BOOL isPresentation = [self isPresentation];

    if(isPresentation)

    {

        [containerView addSubview:toView];

    }

    UIViewController *animatingVC = isPresentation? toVC : fromVC;

    UIView *animatingView = [animatingVC view];

    [animatingView setFrame:[transitionContext finalFrameForViewController:animatingVC]];

    CGAffineTransform presentedTransform = CGAffineTransformIdentity;

    CGAffineTransform dismissedTransform = CGAffineTransformConcat(CGAffineTransformMakeScale(0.001, 0.001), CGAffineTransformMakeRotation(8 * M_PI));

    [animatingView setTransform:isPresentation ? dismissedTransform : presentedTransform];

    [UIView animateWithDuration:[self transitionDuration:transitionContext]

                          delay:0

         usingSpringWithDamping:300.0

          initialSpringVelocity:5.0

                        options:UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionBeginFromCurrentState

                     animations:^{

                         [animatingView setTransform:isPresentation ? presentedTransform : dismissedTransform];

                     }

                     completion:^(BOOL finished){

                         if(![self isPresentation])

                         {

                             [fromView removeFromSuperview];

                         }

                         [transitionContext completeTransition:YES];

                     }];

}

@end