Zoom modal custom animator for iOS

Custom Zoom Modal Animator for iOS

#import "CCCardDetailTransitionAnimator.h"


- (void)prepareForCardDetailSequeWithCard:(CCCard *)card navigationController:(UINavigationController *)navigationController {
    CCCardDetailViewController *destinationVc = (CCCardDetailViewController *)navigationController.viewControllers.firstObject;
    [destinationVc configureWithCard:card delegate:self];
    navigationController.modalPresentationStyle = UIModalPresentationCustom;
    navigationController.transitioningDelegate = self;
}


#pragma mark - UIViewControllerTransitioningDelegate
- (id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source {
    [self.animationController shouldPresent];
    return self.animationController;
}

- (id<UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed {
    [self.animationController shouldDismiss];
    return self.animationController;
}

ZoomModalAnimator.h

#import <Foundation/Foundation.h>

@interface CCCardDetailTransitionAnimator : NSObject <UIViewControllerAnimatedTransitioning>
- (void)shouldPresent;
- (void)shouldDismiss;
- (void)configureDuration:(NSTimeInterval)duration;
@end

ZoomModalAnimator.m

#import "CCCardDetailTransitionAnimator.h"


@interface CCCardDetailTransitionAnimator ()
@property BOOL isPresenting;
@property NSTimeInterval duration;
@end


@implementation CCCardDetailTransitionAnimator

- (instancetype)init {
    self = [super init];
    if (self) {
        self.isPresenting = YES;
        self.duration = 0.35;
    }
    return self;
}

- (void)shouldPresent {
    self.isPresenting = YES;
}

- (void)shouldDismiss {
    self.isPresenting = NO;
}

- (void)configureDuration:(NSTimeInterval)duration {
    self.duration = duration;
}



#pragma mark - UIViewControllerAnimatedTransitioning
- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext {
    return self.duration;
}

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {
    UIViewController *fromVc = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIViewController *toVc = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    UIView *fromView = fromVc.view;
    UIView *toView = toVc.view;
    UIView *containerView = transitionContext.containerView;
    NSTimeInterval duration = [self transitionDuration:transitionContext];
    
    if (self.isPresenting) {
        UIViewController *topFromVc = [self topViewControllerForViewController:fromVc];
        [topFromVc viewWillDisappear:YES];
        
        fromView.userInteractionEnabled = NO;
        
        [containerView addSubview:toView];
        toView.transform = CGAffineTransformMakeScale(0.0, 0.0);
        
        [UIView animateWithDuration:duration animations: ^{
            toView.transform = CGAffineTransformMakeScale(0.9, 0.9);
            fromView.alpha = 0.5;
        } completion: ^(BOOL finished) {
            [transitionContext completeTransition:![transitionContext transitionWasCancelled]];
            
            [topFromVc viewDidDisappear:YES];
        }];
    } else {
        UIViewController *topToVc = [self topViewControllerForViewController:toVc];
        [topToVc viewWillAppear:YES];
        
        [UIView animateWithDuration:duration animations: ^{
            fromView.transform = CGAffineTransformMakeScale(0.01, 0.01);
            toView.alpha = 1.0;
        } completion: ^(BOOL finished) {
            [fromView removeFromSuperview];
            toView.userInteractionEnabled = YES;
            [transitionContext completeTransition:![transitionContext transitionWasCancelled]];
            
            [topToVc viewDidAppear:YES];
        }];
    }
}



#pragma mark - Private
- (UIViewController *)topViewControllerForViewController:(UIViewController *)viewController {
    if ([viewController isKindOfClass:[UINavigationController class]]) {
        UINavigationController *nc = (UINavigationController *)viewController;
        return nc.topViewController;
    } else {
        return viewController;
    }
}

@end