KLParallaxView is an Objective-C UIView subclass that imitates Apple TV's parallax effect, based on the similar MPParallaxView Swift implementation.

KLParallaxView is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod "KLParallaxView"

To run the example project, clone the repo and use the workspace in the Example directory, or alternatively run pod try "KLParallaxView" and run the example target.

KLParallaxView is initialized with an array of subviews whose ordering reflects their positioning in a view hierachy i.e. firstObject is the bottommost view while lastObject is the topmost. By default, KLParallaxView controls each subview's movement during the parallax effect by the value of their tag property.

#import "ViewController.h"
#import "KLParallaxView.h"

@interface ViewController ()

@property (strong, nonatomic) KLParallaxView *parallaxView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    UIImageView *imageView1 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"1"]];
    imageView1.tag = 0;
    UIImageView *imageView2 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"2"]];
    imageView2.tag = 11;
    UIImageView *imageView3 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"3"]];
    imageView3.tag = 2;
    
    NSArray *subviews = @[ imageView1, imageView2, imageView3 ];
    
    self.parallaxView = [[KLParallaxView alloc] initWithFrame:self.view.bounds subviews:subviews];
    [self.view addSubview:self.parallaxView];
}

Set a subview's tag to control how much it moves.

UIImageView *subview = ...
subview.tag = 3;

Use the subviews' positions in the view hierachy rather than their tag property.

self.parallaxView.basedOnHierachy = YES;

Multiply the parallax effect on all views by a given factor.

self.parallaxView.parallaxMultiplier = 2.5;

Multiply the zoom effect on all views by a given factor.

self.parallaxView.zoomMultiplier = 1.5;

Toggle the glowing effect that follows touches.

self.parallaxView.glows = NO;

Change the glow's color.

self.parallaxView.glowColor = [UIColor aqua];

Change the shadow opacity.

self.parallaxView.shadowOpacity = 0.3;

Change the shadow radius for when the view is not animating.

self.parallaxView.initalShadowRadius = 3.5;

Change the shadow radius for when the view is animating.

self.parallaxView.finalShadowRadius = 9.5;

Change the color of the shadow.

self.parallaxView.shadowColor = [UIColor cerulean];

Set the view's corner radius.

self.parallaxView.cornerRadius = 5.0;

Taken from MPParallaxView: Thanks Konstantine Trundayev for Interstellar assets!

KLParallaxView is available under the MIT license. See the LICENSE file for more info.