TOPasscodeViewControllerAnimatedTransitioning.m

//
//  TOPasscodeViewControllerAnimatedTransitioning.m
//
//  Copyright 2017 Timothy Oliver. All rights reserved.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to
//  deal in the Software without restriction, including without limitation the
//  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
//  sell copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
//  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
//  IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#import "TOPasscodeViewControllerAnimatedTransitioning.h"
#import "TOPasscodeViewController.h"
#import "TOPasscodeView.h"

@interface TOPasscodeViewControllerAnimatedTransitioning ()
@property (nonatomic, weak) TOPasscodeViewController *passcodeViewController;
@end

@implementation TOPasscodeViewControllerAnimatedTransitioning

- (instancetype)initWithPasscodeViewController:(TOPasscodeViewController *)passcodeViewController dismissing:(BOOL)dismissing success:(BOOL)success
{
    if (self = [super init]) {
        _passcodeViewController = passcodeViewController;
        _dismissing = dismissing;
        _success = success;
    }

    return self;
}

- (NSTimeInterval)transitionDuration:(nullable id <UIViewControllerContextTransitioning>)transitionContext
{
    return 0.35f;
}

- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext
{
    BOOL isPhone = [UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPhone;
    UIView *containerView = transitionContext.containerView;
    UIVisualEffectView *backgroundEffectView = self.passcodeViewController.backgroundEffectView;
    UIView *backgroundView = self.passcodeViewController.backgroundView;
    UIVisualEffect *backgroundEffect = backgroundEffectView.effect;
    TOPasscodeView *passcodeView = self.passcodeViewController.passcodeView;

    // Set the initial properties when presenting
    if (!self.dismissing) {
        backgroundEffectView.effect = nil;
        backgroundView.alpha = 0.0f;

        self.passcodeViewController.view.frame = containerView.bounds;
        [containerView addSubview:self.passcodeViewController.view];
    }
    else {
        UIViewController *baseController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
        if (baseController.view.superview == nil) {
            [containerView insertSubview:baseController.view atIndex:0];
        }
    }

    CGFloat alpha = self.dismissing ? 1.0f : 0.0f;
    passcodeView.contentAlpha = alpha;

    // Animate the accessory views
    if (isPhone) {
        self.passcodeViewController.leftAccessoryButton.alpha = alpha;
        self.passcodeViewController.rightAccessoryButton.alpha = alpha;
        self.passcodeViewController.cancelButton.alpha = alpha;
        self.passcodeViewController.biometricButton.alpha  = alpha;
    }

    id animationBlock = ^{
        backgroundEffectView.effect = self.dismissing ? nil : backgroundEffect;
        backgroundView.alpha = self.dismissing ? 0.0f : 1.0f;

        CGFloat toAlpha = self.dismissing ? 0.0f : 1.0f;
        passcodeView.contentAlpha = toAlpha;
        if (isPhone) {
            self.passcodeViewController.leftAccessoryButton.alpha = toAlpha;
            self.passcodeViewController.rightAccessoryButton.alpha = toAlpha;
            self.passcodeViewController.cancelButton.alpha = toAlpha;
            self.passcodeViewController.biometricButton.alpha  = toAlpha;
        }
    };

    id completedBlock = ^(BOOL completed) {
        backgroundEffectView.effect = backgroundEffect;
        [transitionContext completeTransition:completed];
    };

    // If we're animating out from a successful passcode, play a zooming out animation
    // to give some more context
    if (self.success && self.dismissing) {
        CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform"];
        animation.duration = [self transitionDuration:transitionContext];
        animation.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(0.9f, 0.9f, 1)];
        animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
        [passcodeView.layer addAnimation:animation forKey:@"transform"];
    }

    [UIView animateWithDuration:[self transitionDuration:transitionContext]
                          delay:0.0f
                        options:UIViewAnimationOptionAllowUserInteraction
                     animations:animationBlock
                     completion:completedBlock];
}

@end