UIButton + CenterTextAndImage.swift

import UIKit

extension UIButton {
    func centerTextAndImage(spacing: CGFloat) {
        let insetAmount = spacing / 2
        let writingDirection = UIApplication.shared.userInterfaceLayoutDirection
        let factor: CGFloat = writingDirection == .leftToRight ? 1 : -1
        self.imageEdgeInsets = UIEdgeInsets(top: 0,
                                            left: -insetAmount*factor,
                                            bottom: 0,
                                            right: insetAmount*factor)
        self.titleEdgeInsets = UIEdgeInsets(top: 0,
                                            left: insetAmount*factor,
                                            bottom: 0,
                                            right: -insetAmount*factor)
        self.contentEdgeInsets = UIEdgeInsets(top: 0,
                                              left: insetAmount,
                                              bottom: 0,
                                              right: insetAmount)
    }
}