UITableViewRowAction with image, swift - swift

Question

In my app I would like to use UITableViewRowAction with image instead of title text. I set background image using:
let edit = UITableViewRowAction(style: .Normal, title: "Edit") { action, index in
self.indexPath = indexPath
self.performSegueWithIdentifier("toEdit", sender: self)
}
edit.backgroundColor = UIColor(patternImage: UIImage(named: "edit")!)
However image appears many times.
How can I fix this to have only one image in row?

Answer 1

The problem is that the image used as pattern won't fit the space, It will be repeated in order to fill it.
One option to have a non-repeated image is to
use a UITableViewCell with fixed height
use image that fits that height

Answer 2

I have wrote a subclass of UITableViewRowAction to help you calculating the length of the title and you just pass the size of rowAction and the image.
class CustomRowAction: UITableViewRowAction {
init(size: CGSize, image: UIImage, bgColor: UIColor) {
super.init()
// calculate actual size & set title with spaces
let defaultTextPadding: CGFloat = 15
let defaultAttributes = [ NSFontAttributeName: UIFont.systemFont(ofSize: 18)] // system default rowAction text font
let oneSpaceWidth = NSString(string: " ").size(attributes: defaultAttributes).width
let titleWidth = size.width - defaultTextPadding * 2
let numOfSpace = Int(ceil(titleWidth / oneSpaceWidth))
let placeHolder = String(repeating: " ", count: numOfSpace)
let newWidth = (placeHolder as NSString).size(attributes: defaultAttributes).width + defaultTextPadding * 2
let newSize = CGSize(width: newWidth, height: size.height)
title = placeHolder
// set background with pattern image
UIGraphicsBeginImageContextWithOptions(newSize, false, UIScreen.main.nativeScale)
let context = UIGraphicsGetCurrentContext()!
context.setFillColor(bgColor.cgColor)
context.fill(CGRect(origin: .zero, size: newSize))
let originX = (newWidth - image.size.width) / 2
let originY = (size.height - image.size.height) / 2
image.draw(in: CGRect(x: originX, y: originY, width: image.size.width, height: image.size.height))
let patternImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
backgroundColor = UIColor(patternImage: patternImage)
}
}
You can see my project: CustomSwipeCell for more detail.