let image1 = UIImage(named: "1.jpg")
    let imageview = UIImageView(image: image1)
    imageview.contentMode = UIViewContentMode.ScaleAspectFill
    self.view.addSubview(imageview)

imageview.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)