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| 1 | +// |
| 2 | +// CENatGeoAnimationController.m |
| 3 | +// TransitionsDemo |
| 4 | +// |
| 5 | +// Created by Paweł Wrzosek on 22.10.2013. |
| 6 | +// Copyright (c) 2013 Colin Eberhardt. All rights reserved. |
| 7 | +// |
| 8 | + |
| 9 | +#import "CENatGeoAnimationController.h" |
| 10 | + |
| 11 | +static const CGFloat kAnimationFirstPartRatio = 0.8f; |
| 12 | + |
| 13 | +@implementation CENatGeoAnimationController |
| 14 | + |
| 15 | +- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext { |
| 16 | + // Grab the from and to view controllers from the context |
| 17 | + UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey]; |
| 18 | + UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey]; |
| 19 | + |
| 20 | + [transitionContext.containerView addSubview:fromViewController.view]; |
| 21 | + [transitionContext.containerView addSubview:toViewController.view]; |
| 22 | + |
| 23 | + CALayer *fromLayer; |
| 24 | + CALayer *toLayer; |
| 25 | + |
| 26 | + if (self.reverse) { |
| 27 | + toViewController.view.userInteractionEnabled = YES; |
| 28 | + |
| 29 | + fromLayer = toViewController.view.layer; |
| 30 | + toLayer = fromViewController.view.layer; |
| 31 | + |
| 32 | + // Reset to initial transform |
| 33 | + sourceLastTransform(fromLayer); |
| 34 | + destinationLastTransform(toLayer); |
| 35 | + |
| 36 | + |
| 37 | + //Perform animation |
| 38 | + [UIView animateWithDuration:kAnimationFirstPartRatio * self.duration |
| 39 | + delay:(1.0f - kAnimationFirstPartRatio) * self.duration |
| 40 | + options:UIViewAnimationOptionCurveLinear animations:^{ |
| 41 | + destinationFirstTransform(toLayer); |
| 42 | + } completion:nil]; |
| 43 | + |
| 44 | + [UIView animateWithDuration:self.duration |
| 45 | + delay:0.0f |
| 46 | + options:0 |
| 47 | + animations:^{ |
| 48 | + sourceFirstTransform(fromLayer); |
| 49 | + } completion:^(BOOL finished) { |
| 50 | + CGRect oldFrame = [fromLayer frame]; |
| 51 | + [fromLayer setAnchorPoint:CGPointMake(0.5f, 0.5f)]; |
| 52 | + [fromLayer setFrame:oldFrame]; |
| 53 | + |
| 54 | + [transitionContext completeTransition:YES]; |
| 55 | + }]; |
| 56 | + |
| 57 | + } else { |
| 58 | + fromViewController.view.userInteractionEnabled = NO; |
| 59 | + |
| 60 | + fromLayer = fromViewController.view.layer; |
| 61 | + toLayer = toViewController.view.layer; |
| 62 | + |
| 63 | + // Change anchor point and reposition it. |
| 64 | + CGRect oldFrame = fromLayer.frame; |
| 65 | + [fromLayer setAnchorPoint:CGPointMake(0.0f, 0.5f)]; |
| 66 | + [fromLayer setFrame:oldFrame]; |
| 67 | + |
| 68 | + // Reset to initial transform |
| 69 | + sourceFirstTransform(fromLayer); |
| 70 | + destinationFirstTransform(toLayer); |
| 71 | + |
| 72 | + //Perform animation |
| 73 | + [UIView animateWithDuration:self.duration |
| 74 | + delay:0.0f |
| 75 | + options:0 |
| 76 | + animations:^{ |
| 77 | + destinationLastTransform(toLayer); |
| 78 | + } completion:nil]; |
| 79 | + |
| 80 | + [UIView animateWithDuration:kAnimationFirstPartRatio * self.duration |
| 81 | + delay:(1.0f - kAnimationFirstPartRatio) * self.duration |
| 82 | + options:0 |
| 83 | + animations:^{ |
| 84 | + sourceLastTransform(fromLayer); |
| 85 | + } |
| 86 | + completion:^(BOOL finished) { |
| 87 | + [transitionContext completeTransition:YES]; |
| 88 | + }]; |
| 89 | + } |
| 90 | + |
| 91 | +} |
| 92 | + |
| 93 | +#pragma mark - |
| 94 | + |
| 95 | +#pragma mark - Required 3d Transform |
| 96 | +static void sourceFirstTransform(CALayer *layer) { |
| 97 | + CATransform3D t = CATransform3DIdentity; |
| 98 | + t.m34 = 1.0 / -500; |
| 99 | + t = CATransform3DTranslate(t, 0.0f, 0.0f, 0.0f); |
| 100 | + layer.transform = t; |
| 101 | +} |
| 102 | + |
| 103 | +static void sourceLastTransform(CALayer *layer) { |
| 104 | + CATransform3D t = CATransform3DIdentity; |
| 105 | + t.m34 = 1.0 / -500.0f; |
| 106 | + t = CATransform3DRotate(t, radianFromDegree(80), 0.0f, 1.0f, 0.0f); |
| 107 | + t = CATransform3DTranslate(t, 0.0f, 0.0f, -30.0f); |
| 108 | + t = CATransform3DTranslate(t, 170.0f, 0.0f, 0.0f); |
| 109 | + layer.transform = t; |
| 110 | +} |
| 111 | + |
| 112 | +static void destinationFirstTransform(CALayer * layer) { |
| 113 | + CATransform3D t = CATransform3DIdentity; |
| 114 | + t.m34 = 1.0f / -500.0f; |
| 115 | + // Rotate 5 degrees within the axis of z axis |
| 116 | + t = CATransform3DRotate(t, radianFromDegree(5.0f), 0.0f, 0.0f, 1.0f); |
| 117 | + // Reposition toward to the left where it initialized |
| 118 | + t = CATransform3DTranslate(t, 320.0f, -40.0f, 150.0f); |
| 119 | + // Rotate it -45 degrees within the y axis |
| 120 | + t = CATransform3DRotate(t, radianFromDegree(-45), 0.0f, 1.0f, 0.0f); |
| 121 | + // Rotate it 10 degrees within thee x axis |
| 122 | + t = CATransform3DRotate(t, radianFromDegree(10), 1.0f, 0.0f, 0.0f); |
| 123 | + layer.transform = t; |
| 124 | +} |
| 125 | + |
| 126 | +static void destinationLastTransform(CALayer * layer) { |
| 127 | + CATransform3D t = CATransform3DIdentity; |
| 128 | + t.m34 = 1.0/ -500; |
| 129 | + // Rotate to 0 degrees within z axis |
| 130 | + t = CATransform3DRotate(t, radianFromDegree(0), 0.0f, 0.0f, 1.0f); |
| 131 | + // Bring back to the final position |
| 132 | + t = CATransform3DTranslate(t, 0.0f, 0.0f, 0.0f); |
| 133 | + // Rotate 0 degrees within y axis |
| 134 | + t = CATransform3DRotate(t, radianFromDegree(0), 0.0f, 1.0f, 0.0f); |
| 135 | + // Rotate 0 degrees within x axis |
| 136 | + t = CATransform3DRotate(t, radianFromDegree(0), 1.0f, 0.0f, 0.0f); |
| 137 | + layer.transform = t; |
| 138 | +} |
| 139 | + |
| 140 | +#pragma mark - Convert Degrees to Radian |
| 141 | +static double radianFromDegree(float degrees) { |
| 142 | + return (degrees / 180) * M_PI; |
| 143 | +} |
| 144 | + |
| 145 | +@end |
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