UIImage cardboard does not use scale

Question

I create a custom keyboard and I am having problems adding an image to the cardboard and maintaining the appropriate scale and resolution with the inserted image. Let me start with a screenshot of the keyboard to illustrate my problems:

Thus, the face image in the upper left corner of the keyboard is only UIButton with the original photo set in the background. When the button is pressed, the image changes with the following function:

func imageResize(image:UIImage, size:CGSize)-> UIImage {

    let scale  = UIScreen.mainScreen().scale

    UIGraphicsBeginImageContextWithOptions(size, false, scale)
    var context = UIGraphicsGetCurrentContext()

    CGContextSetInterpolationQuality(context, kCGInterpolationHigh)
    image.drawInRect(CGRect(origin: CGPointZero, size: size))

    let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    return scaledImage
}

UIImage , UIButton , . , , UIImageView, . - , . UIImageView :

func addImageToBottomRight(image: UIImage) {
    var tempImgView = UIImageView(image: image)
    self.view.addSubview(tempImgView)
    tempImgView.frame.offset(dx: 100.0, dy: 50.0)
}

, , , , , :

let pb = UIPasteboard.generalPasteboard()!

var pngType = UIPasteboardTypeListImage[0] as! String
var jpegType = UIPasteboardTypeListImage[2] as! String

pb.image = image
pb.setData(UIImagePNGRepresentation(image), forPasteboardType: pngType)
pb.setData(UIImageJPEGRepresentation(image, 1.0), forPasteboardType: jpegType)

, . - ? , , UIImages .

UIImage , - :

Starting Image Size is (750.0, 750.0)
Size to scale to is: (78.0, 78.0))
Initial Scale: 1.0

Resized Image Size is (78.0, 78.0)
Resized Image Scale: 2.0

Answer 1

, , , , . , , iMessages, whatsapp, .., , , , (, 260 ).

, 150x150 image @1x , 260, .

185 , 520x150. , imessage, 260 , cramming 520x150 260x75, , 75x75 @2x.

UIImage ,

extension UIImage {
    func addMargin(withInsets inset: UIEdgeInsets) -> UIImage? {
         let finalSize = CGSize(width: size.width + inset.left + inset.right, height: size.height + inset.top + inset.bottom)
         let finalRect = CGRect(origin: CGPoint(x: 0, y: 0), size: finalSize)

            UIGraphicsBeginImageContextWithOptions(finalSize, false, scale)
            UIColor.clear.setFill()
            UIGraphicsGetCurrentContext()?.fill(finalRect)

            let pictureOrigin = CGPoint(x: inset.left, y: inset.top)
            let pictureRect = CGRect(origin: pictureOrigin, size: size)

            draw(in: pictureRect)
            let finalImage = UIGraphicsGetImageFromCurrentImageContext()
            defer { UIGraphicsEndImageContext() }

            return finalImage
 }

}