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MRFlipTransition.m
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MRFlipTransition.m
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//
// MRFlipTransitionAnimator.m
//
// Copyright (c) 2014 Michael WU. 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 "MRFlipTransition.h"
#import "UIViewController+MRFlipTransitino.h"
@interface MRGradientShadowedLayer : CALayer
@property (nonatomic, strong) CAGradientLayer *shadowCover;
+ (instancetype)layerWithShadowBeginFromTop:(BOOL)top;
@end
@implementation MRGradientShadowedLayer
- (instancetype)initWithShadowBeginFromTop:(BOOL)top
{
self = [super init];
if (self)
{
self.backgroundColor = [UIColor whiteColor].CGColor;
self.shadowCover = [CAGradientLayer layer];
self.shadowCover.colors = top ?
@[(id)[UIColor colorWithWhite:0 alpha:0.4].CGColor,
(id)[UIColor clearColor].CGColor]
: @[(id)[UIColor clearColor].CGColor,
(id)[UIColor colorWithWhite:0 alpha:0.4].CGColor];
[self addSublayer:self.shadowCover];
self.shadowColor = [UIColor colorWithWhite:0 alpha:0.6].CGColor;
self.shadowOffset = CGSizeMake(0, top ? 1 : -1);
self.shadowRadius = 2.0;
self.shadowOpacity = 0.8;
}
return self;
}
+ (instancetype)layerWithShadowBeginFromTop:(BOOL)top
{
return [[MRGradientShadowedLayer alloc] initWithShadowBeginFromTop:top];
}
- (void)layoutSublayers
{
[super layoutSublayers];
self.shadowCover.frame = self.bounds;
self.shadowPath = [UIBezierPath bezierPathWithRect:self.bounds].CGPath;
}
@end
@interface MRTransformView : UIView
@property (nonatomic, strong) CATransformLayer *transformLayer;
@property (nonatomic, strong) MRGradientShadowedLayer *lowerLayer;
@property (nonatomic, strong) CALayer *upperFrontLayer;
@property (nonatomic, strong) MRGradientShadowedLayer *upperBackLayer;
@end
@implementation MRTransformView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
self.transformLayer = [CATransformLayer layer];
[self.layer addSublayer:self.transformLayer];
self.lowerLayer = [MRGradientShadowedLayer layerWithShadowBeginFromTop:YES];
self.lowerLayer.backgroundColor = [UIColor colorWithWhite:0.9 alpha:1.0].CGColor;
self.lowerLayer.contentsRect = CGRectMake(0, 0.5, 1, 0.5);
self.lowerLayer.doubleSided = NO;
[self.transformLayer addSublayer:self.lowerLayer];
self.upperFrontLayer = [CALayer layer];
self.upperFrontLayer.backgroundColor = [UIColor colorWithWhite:0.9 alpha:1.0].CGColor;
self.upperFrontLayer.anchorPoint = CGPointMake(0.5, 0.0);
self.upperFrontLayer.contentsRect = CGRectMake(0, 0.5, 1, 0.5);
self.upperFrontLayer.doubleSided = NO;
[self.transformLayer addSublayer:self.upperFrontLayer];
self.upperBackLayer = [MRGradientShadowedLayer layerWithShadowBeginFromTop:NO];
self.upperBackLayer.backgroundColor = [UIColor colorWithWhite:0.9 alpha:1.0].CGColor;
self.upperBackLayer.anchorPoint = CGPointMake(0.5, 1.0);
self.upperBackLayer.contentsRect = CGRectMake(0, 0, 1, 0.5);
self.upperBackLayer.doubleSided = NO;
[self.transformLayer addSublayer:self.upperBackLayer];
}
return self;
}
- (void)layoutSubviews
{
[super layoutSubviews];
self.transformLayer.frame = self.bounds;
CATransform3D sublayerTransform = self.transformLayer.sublayerTransform;
sublayerTransform.m34 = -1 / (CGRectGetHeight(self.bounds) * 4.7 * 0.5);
self.transformLayer.sublayerTransform = sublayerTransform;
CGRect upperRect = CGRectMake(0,
0,
CGRectGetWidth(self.bounds),
CGRectGetHeight(self.bounds) / 2.0);
CGRect lowerRect = CGRectMake(0,
CGRectGetHeight(upperRect),
CGRectGetWidth(upperRect),
CGRectGetHeight(upperRect));
self.upperFrontLayer.frame = self.lowerLayer.frame = lowerRect;
self.upperBackLayer.frame = upperRect;
}
@end
@interface MRFlipTransition ()
@property (nonatomic, strong) UIImage *contentImage;
@property (assign, getter = isPresentAnimation) BOOL presentAnimation;
@property (nonatomic, weak) UIViewController *presentingViewController;
@property (assign) MRFlipTransitionPresentingStyle style;
@property (nonatomic, strong) MRTransformView *transformView;
@property (nonatomic, strong) UIView *shadowView;
@end
static NSTimeInterval const MRFlipEaseInDuration = 0.4;
static NSTimeInterval const MRFlipLayerDuration = 0.8;
static CGFloat const MRInfinityMerginY = 10.0;
static CGFloat const MREaseInExtraDistance = 40.0;
static CGFloat const MRScaleFactor = 0.875;
static CGFloat const MRInfinityFactor = 0.01;
@implementation MRFlipTransition
- (instancetype)initWithPresentingViewController:(UIViewController *)controller;
{
NSParameterAssert(controller);
self = [super init];
if (self)
{
_presentAnimation = YES;
_presentingViewController = controller;
_shadowView = [[UIView alloc] initWithFrame:CGRectZero];
_shadowView.backgroundColor = [UIColor colorWithWhite:0.0 alpha:0.8];
_shadowView.layer.opacity = 0.0;
}
return self;
}
- (void)present:(UIViewController *)viewController from:(MRFlipTransitionPresentingStyle)direction completion:(void (^)(void))completion
{
if (!_presentAnimation || !viewController || self.presentingViewController.presentedViewController)
{
return;
}
_style = direction;
viewController.modalPresentationStyle = UIModalPresentationCustom;
viewController.transitioningDelegate = self;
[self.presentingViewController presentViewController:viewController animated:YES completion:completion];
}
- (void)dismissTo:(MRFlipTransitionPresentingStyle)direction completion:(void(^)(void))completion
{
if (_presentAnimation || !self.presentingViewController.presentedViewController || self.presentingViewController.presentedViewController.isBeingDismissed)
{
return;
}
_style = direction;
[self.presentingViewController dismissViewControllerAnimated:YES completion:completion];
}
#pragma mark - UIViewControllerTransitioningDelegate
- (id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source
{
return self;
}
- (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed
{
return self;
}
#pragma mark - Snapshot
- (void)updateContentSnapshot:(UIView *)view afterScreenUpdate:(BOOL)update
{
if (CGSizeEqualToSize(view.bounds.size, CGSizeZero))
{
return;
}
UIGraphicsBeginImageContextWithOptions(view.bounds.size, NO, 0.0);
[view drawViewHierarchyInRect:view.bounds afterScreenUpdates:update];
UIImage *snapshotImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
self.contentImage = snapshotImage;
}
#pragma mark - UIViewControllerAnimatedTransitioning delegate
- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext
{
return MRFlipEaseInDuration + MRFlipLayerDuration;
}
- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
UIView *fromView = [fromViewController viewForTransitionContext:transitionContext];
UIView *toView = [toViewController viewForTransitionContext:transitionContext];
UIView *containerView = [transitionContext containerView];
_transformView.upperFrontLayer.contents = (__bridge id)(self.coverImage.CGImage);
if (_presentAnimation)
{
_transformView = [[MRTransformView alloc] initWithFrame:containerView.bounds];
_shadowView.frame = containerView.bounds;
[self prepareLayersWithCompletionBlock:^{
CGRect endFrame = fromViewController.view.bounds;
toView.frame = endFrame;
toView.alpha = 0.0;
[containerView addSubview:toView];
[containerView addSubview:_shadowView];
[containerView addSubview:_transformView];
_transformView.upperBackLayer.contents = (__bridge id)(self.contentImage.CGImage);
_transformView.lowerLayer.contents = (__bridge id)(self.contentImage.CGImage);
[self animateEaseInAnimationWithCompletionBlock:^{
[self animateFlipFrontLayerWithCompletionBlock:^{
_transformView.upperFrontLayer.opacity = 0.0;
_transformView.upperBackLayer.opacity = 1.0;
[self animateFlipBackLayerWithCompletionBlock:^{
BOOL isCancelled = [transitionContext transitionWasCancelled];
if (!isCancelled)
{
[_transformView removeFromSuperview];
[_shadowView removeFromSuperview];
}
_presentAnimation = isCancelled;
toView.alpha = isCancelled ? 0.0 : 1.0;
[transitionContext completeTransition:!isCancelled];
}];
}];
}];
}];
}
else
{
[self updateContentSnapshot:fromViewController.view afterScreenUpdate:NO];
[fromView removeFromSuperview];
[containerView addSubview:toView];
[containerView addSubview:_shadowView];
[containerView addSubview:_transformView];
_transformView.upperBackLayer.contents = (__bridge id)(self.contentImage.CGImage);
_transformView.lowerLayer.contents = (__bridge id)(self.contentImage.CGImage);
[self animateFlipBackLayerWithCompletionBlock:^{
_transformView.upperBackLayer.opacity = 0.0;
_transformView.upperFrontLayer.opacity = 1.0;
[self animateFlipFrontLayerWithCompletionBlock:^{
[self animateEaseInAnimationWithCompletionBlock:^{
BOOL isCancelled = [transitionContext transitionWasCancelled];
if (!isCancelled)
{
[_transformView removeFromSuperview];
[_shadowView removeFromSuperview];
_transformView = nil;
}
_presentAnimation = !isCancelled;
[transitionContext completeTransition:!isCancelled];
}];
}];
}];
}
}
#pragma mark - Preparation
- (void)prepareLayersWithCompletionBlock:(void(^)(void))block
{
[CATransaction begin];
[CATransaction setValue:[NSNumber numberWithFloat:0.0] forKey:kCATransactionAnimationDuration];
[CATransaction setCompletionBlock:block];
if (_presentAnimation)
{
_transformView.upperFrontLayer.transform = CATransform3DIdentity;
_transformView.upperBackLayer.transform = CATransform3DMakeRotation(-M_PI_2, 1.0, 0.0, 0.0);
_transformView.upperBackLayer.shadowCover.opacity = 0.5;
_transformView.lowerLayer.transform = CATransform3DIdentity;
_transformView.lowerLayer.shadowCover.opacity = 1.0;
CATransform3D transform = _transformView.layer.transform;
if (_style == MRFlipTransitionPresentingFromBottom)
{
transform = CATransform3DScale(transform, MRScaleFactor, MRScaleFactor, 1.0);
transform = CATransform3DTranslate(transform, 0, CGRectGetHeight([UIScreen mainScreen].bounds), 0);
}
else
{
transform = CATransform3DScale(transform, MRInfinityFactor * MRScaleFactor, MRInfinityFactor * MRScaleFactor, 1.0);
transform = CATransform3DTranslate(transform, 0, MRInfinityMerginY, 0);
}
_transformView.layer.transform = transform;
}
else
{
_transformView.upperFrontLayer.transform = CATransform3DMakeRotation(M_PI_2, 1.0, 0.0, 0.0);
_transformView.upperBackLayer.transform = CATransform3DIdentity;
_transformView.upperBackLayer.shadowCover.opacity = 0.0;
_transformView.lowerLayer.transform = CATransform3DIdentity;
_transformView.lowerLayer.shadowCover.opacity = 0.0;
_transformView.layer.transform = CATransform3DIdentity;
}
[CATransaction commit];
}
#pragma mark - Animations
- (void)animateEaseInAnimationWithCompletionBlock:(void(^)(void))block
{
[CATransaction begin];
[CATransaction setValue:[NSNumber numberWithFloat:MRFlipEaseInDuration] forKey:kCATransactionAnimationDuration];
[CATransaction setValue:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut] forKey:kCATransactionAnimationTimingFunction];
[CATransaction setCompletionBlock:block];
BOOL fromBottom = _style == MRFlipTransitionPresentingFromBottom;
CATransform3D transform = _transformView.layer.transform;
if (fromBottom)
{
transform = CATransform3DTranslate(transform, 0, (CGRectGetHeight([UIScreen mainScreen].bounds) + MREaseInExtraDistance) * (_presentAnimation ? -1 : 1) , 0);
CABasicAnimation *easeInAnimation = [CABasicAnimation animationWithKeyPath:@"transform.translation.y"];
easeInAnimation.fromValue = _presentAnimation ? @(CGRectGetHeight([UIScreen mainScreen].bounds)) : @(-MREaseInExtraDistance);
easeInAnimation.toValue = _presentAnimation ? @(-MREaseInExtraDistance) : @(CGRectGetHeight([UIScreen mainScreen].bounds));
easeInAnimation.fillMode = kCAFillModeForwards;
easeInAnimation.removedOnCompletion = NO;
[_transformView.layer addAnimation:easeInAnimation forKey:nil];
_transformView.layer.transform = transform;
}
else
{
CGFloat factor = _presentAnimation ? 1 / MRInfinityFactor : MRInfinityFactor;
CGFloat distance = _presentAnimation ? - MREaseInExtraDistance - MRInfinityMerginY * MRInfinityFactor : (MREaseInExtraDistance + MRInfinityMerginY) * (1 / MRInfinityFactor);
CATransform3D presentTransform = CATransform3DScale(transform, factor, factor, 1.0);
presentTransform = CATransform3DTranslate(presentTransform, 0, distance, 0);
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform"];
animation.fromValue = [NSValue valueWithCATransform3D:transform ];
animation.toValue = [NSValue valueWithCATransform3D:presentTransform];
animation.fillMode = kCAFillModeForwards;
animation.removedOnCompletion = NO;
[_transformView.layer addAnimation:animation forKey:nil];
_transformView.layer.transform = presentTransform;
}
CABasicAnimation *shadowAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
shadowAnimation.fromValue = _presentAnimation ? @0.0 : @0.4;
shadowAnimation.toValue = _presentAnimation ? @0.4 : @0.0;
shadowAnimation.removedOnCompletion = NO;
shadowAnimation.fillMode = kCAFillModeForwards;
[_shadowView.layer addAnimation:shadowAnimation forKey:nil];
_shadowView.layer.opacity = _presentAnimation ? 0.4 : 0.0;
[CATransaction commit];
}
- (void)animateFlipFrontLayerWithCompletionBlock:(void(^)(void))block
{
[CATransaction begin];
[CATransaction setValue:[NSNumber numberWithFloat:MRFlipLayerDuration / 2.0] forKey:kCATransactionAnimationDuration];
[CATransaction setValue:[CAMediaTimingFunction functionWithName:_presentAnimation ? kCAMediaTimingFunctionEaseIn : kCAMediaTimingFunctionEaseOut] forKey:kCATransactionAnimationTimingFunction];
[CATransaction setCompletionBlock:block];
CABasicAnimation *rotateAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.x"];
rotateAnimation.fromValue = _presentAnimation ? @0 : @(M_PI_2);
rotateAnimation.toValue = _presentAnimation ? @(M_PI_2) : @0;
rotateAnimation.fillMode = kCAFillModeForwards;
rotateAnimation.removedOnCompletion = NO;
[_transformView.upperFrontLayer addAnimation:rotateAnimation forKey:nil];
_transformView.upperFrontLayer.transform = CATransform3DRotate(_transformView.upperFrontLayer.transform, M_PI_2 * (_presentAnimation ? 1 : -1), 1.0, 0, 0);
CABasicAnimation *opacityLowerAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
opacityLowerAnimation.fromValue = _presentAnimation ? @1 : @0.5;
opacityLowerAnimation.toValue = _presentAnimation ? @0.5 : @1;
opacityLowerAnimation.fillMode = kCAFillModeForwards;
opacityLowerAnimation.removedOnCompletion = NO;
[_transformView.lowerLayer.shadowCover addAnimation:opacityLowerAnimation forKey:nil];
_transformView.lowerLayer.shadowCover.opacity = _presentAnimation ? 0.5 : 1.0;
CABasicAnimation *shadowAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
shadowAnimation.fromValue = _presentAnimation ? @0.4 : @0.7;
shadowAnimation.toValue = _presentAnimation ? @0.7 : @0.4;
shadowAnimation.removedOnCompletion = NO;
shadowAnimation.fillMode = kCAFillModeForwards;
[_shadowView.layer addAnimation:shadowAnimation forKey:nil];
_shadowView.layer.opacity = _presentAnimation ? 0.7 : 0.4;
[CATransaction commit];
}
- (void)animateFlipBackLayerWithCompletionBlock:(void(^)(void))block
{
[CATransaction begin];
[CATransaction setValue:[NSNumber numberWithFloat:MRFlipLayerDuration / 2.0] forKey:kCATransactionAnimationDuration];
[CATransaction setValue:[CAMediaTimingFunction functionWithName:_presentAnimation ? kCAMediaTimingFunctionEaseOut : kCAMediaTimingFunctionEaseIn] forKey:kCATransactionAnimationTimingFunction];
[CATransaction setCompletionBlock:block];
CATransform3D transform = _transformView.layer.transform;
if (_presentAnimation)
{
transform = CATransform3DTranslate(transform, 0, MREaseInExtraDistance, 0);
transform = CATransform3DScale(transform, 1 / MRScaleFactor, 1 / MRScaleFactor, 1.0);
}
else
{
transform = CATransform3DTranslate(transform, 0, - MREaseInExtraDistance, 0);
transform = CATransform3DScale(transform, MRScaleFactor, MRScaleFactor, 1.0);
}
CABasicAnimation *transformLayerAnimation = [CABasicAnimation animationWithKeyPath:@"transform"];
transformLayerAnimation.fromValue = [NSValue valueWithCATransform3D:_transformView.layer.transform];
transformLayerAnimation.toValue = [NSValue valueWithCATransform3D:transform];
transformLayerAnimation.fillMode = kCAFillModeForwards;
transformLayerAnimation.removedOnCompletion = NO;
[_transformView.layer addAnimation:transformLayerAnimation forKey:nil];
_transformView.layer.transform = transform;
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.x"];
animation.fromValue = _presentAnimation ? @(-M_PI_2) : @0;
animation.toValue = _presentAnimation ? @0 : @(-M_PI_2);
animation.fillMode = kCAFillModeForwards;
animation.removedOnCompletion = NO;
[_transformView.upperBackLayer addAnimation:animation forKey:nil];
_transformView.upperBackLayer.transform = CATransform3DRotate(_transformView.upperBackLayer.transform, M_PI_2 * (_presentAnimation ? 1 : -1), 1.0, 0, 0);
CABasicAnimation *opacityAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
opacityAnimation.fromValue = _presentAnimation ? @0.5 : @0.0;
opacityAnimation.toValue = _presentAnimation ? @0.0 : @0.5;
opacityAnimation.fillMode = kCAFillModeForwards;
opacityAnimation.removedOnCompletion = NO;
[_transformView.upperBackLayer.shadowCover addAnimation:opacityAnimation forKey:nil];
[_transformView.lowerLayer.shadowCover addAnimation:opacityAnimation forKey:nil];
_transformView.upperBackLayer.shadowCover.opacity = _presentAnimation ? 0.0 : 0.5;
_transformView.lowerLayer.shadowCover.opacity = _presentAnimation ? 0.0 : 0.5;
CABasicAnimation *shadowAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
shadowAnimation.fromValue = _presentAnimation ? @0.7 : @1.0;
shadowAnimation.toValue = _presentAnimation ? @1.0 : @0.7;
shadowAnimation.removedOnCompletion = NO;
shadowAnimation.fillMode = kCAFillModeForwards;
[_shadowView.layer addAnimation:shadowAnimation forKey:nil];
_shadowView.layer.opacity = _presentAnimation ? 1.0 : 0.7;
[CATransaction commit];
}
@end