/*

     File: ParallaxBlurVC.m

 Abstract: Demonstrates how to create a dynamic blur underneath a view with 

 motion effects applied that overlies a static background.

  Version: 1.0

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 */

#import "ParallaxBlurVC.h"

@interface ParallaxBlurVC ()

@property (nonatomic, weak) IBOutlet UIImageView *backgroundImageView;

@property (nonatomic, weak) IBOutlet UIImageView *foregroundImageView;

@property (nonatomic, weak) IBOutlet UIView *foregroundView;

@property (nonatomic, strong) UIMotionEffectGroup *foregroundViewMotionEffect;

@property (nonatomic, strong) UIMotionEffectGroup *foregroundImageViewMotionEffect;

@end

@implementation ParallaxBlurVC

//| ----------------------------------------------------------------------------

- (void)viewDidLoad

{

    [super viewDidLoad];

    self.foregroundView.layer.cornerRadius = 6.0f;

    self.foregroundView.layer.masksToBounds = YES;

    // Create and apply the motion effect for the foreground view.

    {

        UIInterpolatingMotionEffect *xAxis = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.x" type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];

        xAxis.minimumRelativeValue = @(-30.0);

        xAxis.maximumRelativeValue = @(30.0);

        UIInterpolatingMotionEffect *yAxis = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.y" type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];

        yAxis.minimumRelativeValue = @(-15.0);

        yAxis.maximumRelativeValue = @(15.0);

        self.foregroundViewMotionEffect = [[UIMotionEffectGroup alloc] init];

        self.foregroundViewMotionEffect.motionEffects = @[xAxis, yAxis];

        [self.foregroundView addMotionEffect:self.foregroundViewMotionEffect];

    }

    // Create and apply the motion effect for the foreground image view.

    {

        UIInterpolatingMotionEffect *xAxis = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.x" type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];

        xAxis.minimumRelativeValue = @(30.0);

        xAxis.maximumRelativeValue = @(-30.0);

        UIInterpolatingMotionEffect *yAxis = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.y" type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];

        yAxis.minimumRelativeValue = @(15.0);

        yAxis.maximumRelativeValue = @(-15.0);

        self.foregroundImageViewMotionEffect = [[UIMotionEffectGroup alloc] init];

        self.foregroundImageViewMotionEffect.motionEffects = @[xAxis, yAxis];

        [self.foregroundImageView addMotionEffect:self.foregroundImageViewMotionEffect];

    }

}

@end