objective-c : make basic table view with custom background and jason data v.7

snippet.m

//make basic table view with custom background and jason data v.7
//add motion effects

- (void)viewDidLoad
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    ...
    
    // Background image
//    UIImageView* backgroundImageView = [[UIImageView alloc] initWithImage:
//                                        [UIImage imageNamed:@"Background-LowerLayer.png"]];
//    [self.view addSubview:backgroundImageView];
//    
//    // Header logo
//    UIImageView* header = [[UIImageView alloc] initWithImage:
//                           [UIImage imageNamed:@"Sarnie.png"]];
//    header.center = CGPointMake(220, 190);
//    [self.view addSubview:header];
   
    
    //add motion effects
    
    // 1. add the lower background layer
    UIImageView* backgroundImageView = [[UIImageView alloc]
                                        initWithImage:[UIImage imageNamed:@"Background-LowerLayer.png"]];
    backgroundImageView.frame = CGRectInset(self.view.frame, -50.0f, -50.0f);
    [self.view addSubview:backgroundImageView];
    [self addMotionEffectToView: backgroundImageView magnitude:50.0f];
    
    // 2. add the background mid layer
    UIImageView* midLayerImageView = [[UIImageView alloc]
                                      initWithImage:[UIImage imageNamed:@"Background-MidLayer.png"]];
    [self.view addSubview:midLayerImageView];
    
    // 3. add the foreground image
    UIImageView* header = [[UIImageView alloc]
                           initWithImage:[UIImage imageNamed:@"Sarnie.png"]];
    header.center = CGPointMake(220, 190);
    [self.view addSubview:header];
    [self addMotionEffectToView:header magnitude:-20.0f];
    
    ...
}
    

#pragma mark - //add motion effects

- (void)addMotionEffectToView:(UIView*)view magnitude:(CGFloat)magnitude {
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    //add motion effects
    //UIInterpolatingMotionEffect instances: tracks horizontal motion and vertical motion.
    
    UIInterpolatingMotionEffect* xMotion = [[UIInterpolatingMotionEffect alloc]
                                            initWithKeyPath:@"center.x"
                                            type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];
    xMotion.minimumRelativeValue = @(-magnitude);
    xMotion.maximumRelativeValue = @(magnitude);
    
    UIInterpolatingMotionEffect* yMotion = [[UIInterpolatingMotionEffect alloc]
                                            initWithKeyPath:@"center.y"
                                            type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];
    yMotion.minimumRelativeValue = @(-magnitude);
    yMotion.maximumRelativeValue = @(magnitude);
    
    UIMotionEffectGroup* group = [[UIMotionEffectGroup alloc] init];
    group.motionEffects = @[xMotion, yMotion];
    [view addMotionEffect:group];
}


@end