UITextField subclass adding placeholderColor property

ColorPHTextField.swift

// TODO: link here to SO post that inspired this
// ^ that source worked fine when setting placeholderColor sometime after
// placeholder or attributedPlaceholder, but not the other way around.
// this is an attempt to fix this, it might work.

class ColorPHTextField : UITextField {
    
    @IBInspectable var placeholderColor: UIColor? {
        didSet {
            applyPlaceholderColor()
        }
    }
    
    override var placeholder: String? {
        didSet {
            //log("set textfield placeholder to \"self.placeholder\"")
            if placeholderColor != nil {
                applyPlaceholderColor()
            }
        }
    }
    override var attributedPlaceholder: NSAttributedString? {
        didSet {
            //log("set textfield attributed placeholder to \"self.placeholder\"")
            if placeholderColor != nil {
                applyPlaceholderColor()
            }
        }
    }
    
    private func applyPlaceholderColor() {
        let attrString = self.attributedPlaceholder != nil ? NSMutableAttributedString(attributedString: self.attributedPlaceholder!) :
            NSMutableAttributedString(string: self.placeholder ?? "")
        let wholeRange = NSMakeRange(0, attrString.length)
        if let color = placeholderColor {
            //log("setting custom color of placeholder \"self.placeholder\" to \(color.hexString(false))")
            attrString.setAttributes([NSForegroundColorAttributeName: color], range: wholeRange)
        } else {
            //log("unsetting custom color of placeholder \"self.placeholder\"")
            attrString.removeAttribute(NSForegroundColorAttributeName, range: wholeRange)
        }
        self.attributedPlaceholder = attrString
    }
    
}