Для этого вы можете использовать атрибутивную строку:
// create a NSMutableAttributedString with the text before the image
let beginning = NSMutableAttributedString(string: "Beginning")
// create a NSTextAttachment with the image
let imageAttachment = NSTextAttachment()
imageAttachment.image = UIImage(named: "image.png")
// create an NSMutableAttributedString with the image
let imageString = NSAttributedString(attachment: imageAttachment)
// add the image to the string
beginning.append(imageString)
// create an NSMutableAttributedString with the text after the image
let end = NSAttributedString(string: "End")
beginning.append()
// set the attributed text of the label
label.attributedText = beginning