Setters and Getters of DVParallaxView (w/o gyro)

DVParallaxViewSettersAndGetters.m

#pragma mark - Getters

-(UIImageView *)backgroundImageView {
    if (!_backgroundImageView) {
        _backgroundImageView = [[UIImageView alloc] init];
        _backgroundImageView.contentMode = UIViewContentModeCenter;
        _backgroundImageView.center = CGPointMake(CGRectGetMidX(self.bounds),
                                                  CGRectGetMidY(self.bounds));
    }
    
    return _backgroundImageView;
}

#pragma mark - Setters

-(void)setParallaxDistanceFactor:(float)parallaxDistanceFactor {
    _parallaxDistanceFactor = MAX(0.f, parallaxDistanceFactor);
}

-(void)setParallaxFrontFactor:(float)parallaxFrontFactor {
    _parallaxFrontFactor = MAX(0.f, parallaxFrontFactor);
}

-(void)setBackgroundImage:(UIImage *)backgroundImage {
    _backgroundImage = backgroundImage;
    [self.backgroundImageView setImage:_backgroundImage];
    
    CGPoint origin = CGPointMake(CGRectGetMidX(self.bounds) - backgroundImage.size.width/2.f,
                                 CGRectGetMidY(self.bounds) - backgroundImage.size.height/2.f);
    
    self.backgroundImageView.frame = (CGRect){.origin = origin, .size = backgroundImage.size};
}

-(void)setFrontView:(UIView *)frontView {
    _frontView = frontView;
    [self addSubview:frontView];
}

#pragma mark - Overriding

-(void)addSubview:(UIView *)view {
    if (self.frontView)
        [super insertSubview:view belowSubview:self.frontView];
    else
        [super addSubview:view];
}