UIView+Parallax Category For Easy Parallax and Shadow Movement

UIView+Parallax.h

//
//  UIView+Parallax.h
//  Orbosphere
//
//  Created by Julian Hays on 4/22/14.
//  Inspired By Ash Furrow - http://www.teehanlax.com/blog/introduction-to-uimotioneffect/ - September 19,2013
//  and Michael Burford - http://michael.burford.net/2013/10/ios7-parallax-shadows.html - Thursday, October 10, 2013
//
//

#import <UIKit/UIKit.h>

@interface UIView (Parallax)

- (void)addShadowing;
- (void)addShadowParallaxMotionEffect:(CGFloat)amount;
- (void)addParallaxMotionEffect:(CGFloat)amount;

@end

UIView+Parallax.m

//
//  UIView+Parallax.m
//  Orbosphere
//
//  Created by Julian Hays on 4/22/14.
//  Inspired By Ash Furrow - http://www.teehanlax.com/blog/introduction-to-uimotioneffect/ - September 19,2013
//  and Michael Burford - http://michael.burford.net/2013/10/ios7-parallax-shadows.html - Thursday, October 10, 2013
//
//

#import "UIView+Parallax.h"

@implementation UIView (Parallax)

- (void)addShadowing {
    [self.layer setShadowColor:[UIColor blackColor].CGColor];
    [self.layer setShadowOpacity:0.4];
    [self.layer setShadowRadius:3.0];
    [self.layer setShadowOffset:CGSizeMake(0, 2)];
}

- (void)addShadowParallaxMotionEffect:(CGFloat)amount {
    amount = 10.0*amount;
    UIInterpolatingMotionEffect *motionX = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"layer.shadowOffset.width" type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];
    [motionX setMaximumRelativeValue:@(amount)];
    [motionX setMinimumRelativeValue:@(-amount)];
    UIInterpolatingMotionEffect *motionY = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"layer.shadowOffset.height" type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];
    [motionY setMaximumRelativeValue:@(amount)];
    [motionY setMinimumRelativeValue:@(-amount)];
    UIMotionEffectGroup *group = [[UIMotionEffectGroup alloc] init];
    group.motionEffects = @[motionX, motionY];
    [self addMotionEffect:group];
}

- (void)addParallaxMotionEffect:(CGFloat)amount
{
    amount = 10.0*amount;
    
    UIInterpolatingMotionEffect *verticalMotionEffect = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.y" type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];
    
    verticalMotionEffect.minimumRelativeValue = @(-amount);
    
    verticalMotionEffect.maximumRelativeValue = @(amount);
    
    UIInterpolatingMotionEffect *horizontalMotionEffect = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.x" type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];
    
    horizontalMotionEffect.minimumRelativeValue = @(-amount);
    
    horizontalMotionEffect.maximumRelativeValue = @(amount);
    
    UIMotionEffectGroup *group = [UIMotionEffectGroup new];
    
    group.motionEffects = @[horizontalMotionEffect, verticalMotionEffect];
    
    [self addMotionEffect:group];
}

@end