iOS 7 Parallax effect

gistfile1.m

@interface UIView (JSParallaxEffect)

- (void)js_addParallaxEffectWithMaxOffset:(CGFloat)maxOffset;

@end

gistfile2.m

@implementation UIView (JSParallaxEffect)

- (void)js_addParallaxEffectWithMaxOffset:(CGFloat)maxOffset;
{
    UIInterpolatingMotionEffect *parallaxEffectX = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.x"
                                                                                                   type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];
    UIInterpolatingMotionEffect *parallaxEffectY = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.y"
                                                                                                   type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];

    parallaxEffectX.minimumRelativeValue = @(-maxOffset);
    parallaxEffectX.maximumRelativeValue = @(maxOffset);

    parallaxEffectY.minimumRelativeValue = parallaxEffectX.minimumRelativeValue;
    parallaxEffectY.maximumRelativeValue = parallaxEffectX.maximumRelativeValue;

    UIMotionEffectGroup *effectGroup = [[UIMotionEffectGroup alloc] init];
    effectGroup.motionEffects = @[parallaxEffectX, parallaxEffectY];

    [self addMotionEffect:effectGroup];
}

@end