Init method of DVParallaxView class

DVParallaxViewInitWithFrame.m

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.parallaxDistanceFactor = 2.f;
        self.parallaxFrontFactor = 20.f;
        self.backgroundColor = [UIColor clearColor];
        [self addSubview:self.backgroundImageView];
        
        UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panHandler:)];
        [self addGestureRecognizer:panRecognizer];
    }
    return self;
}