[ios] UIAlertController custom font, size, color

Swift 4

Example of custom font on the title. Same things for other components such as message or actions.

    let titleAttributed = NSMutableAttributedString(
            string: Constant.Strings.cancelAbsence, 
            attributes: [NSAttributedStringKey.font:UIFont(name:"FONT_NAME",size: FONT_SIZE)]
    )

    let alertController = UIAlertController(
        title: "",
        message: "",
        preferredStyle: UIAlertControllerStyle.YOUR_STYLE
    )

    alertController.setValue(titleAttributed, forKey : "attributedTitle")
    present(alertController, animated: true, completion: nil)

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