bookview.swift

if let coverString  = myBookFromJSON?.data["cover"] as! String! {
            if let url = NSURL(string: coverString) {
                print(url)
                let imgView = UIImageView()
                imgView.pin_setImageFromURL(url)
                print(imgView.image)
                
                headerView = ParallaxHeaderView.parallaxHeaderViewWithImage(imgView.image, forSize: CGSizeMake(self.tableview.frame.size.height, 300)) as! ParallaxHeaderView
                self.tableview.tableHeaderView = headerView
                
            }
}else{
    [...]
}