How to edit UIAlertAction text font size and color

Question

How to edit UIAlertAction text size and color? I have taken a UIAlertController acoording to it how to edit the size. This i smy Code

Answer 1

Here is giving my answer Swift 5. We can apply custom fonts to AlertView and AlertAddAction.
1st Create AlertView Extention. Inside Extension

import Foundation
import UIKit

extension UIAlertController {
    
    func applyBranding() {
        
        applyAlertTitleBranding()
        applyAlertMessageBranding()
    }
    
    func applyAlertTitleBranding() {
        let titleFont = [kCTFontAttributeName: UIFont(name: "Montserrat-Medium", size: 18.0)!]
        let titleAttrString = NSMutableAttributedString(string: title!, attributes: titleFont as [NSAttributedString.Key : Any])
        let titleColor = UIColor(red: 34.0/255/0, green: 34.0/255/0, blue: 34.0/255/0, alpha: 1.0)
        titleAttrString.addAttribute(NSAttributedString.Key.foregroundColor,
                                     value: titleColor,
                                     range: NSRange(location: 0, length: title!.count))
        setValue(titleAttrString, forKey: "attributedTitle")
    }
    
    func applyAlertMessageBranding() {
        let messageFont = [kCTFontAttributeName: UIFont(name: "Montserrat-Regular", size: 14.0)!]
        let messageAttrString = NSMutableAttributedString(string: message!, attributes: messageFont as [NSAttributedString.Key : Any])
        let messageTitleColor = UIColor(red: 68.0/255/0, green: 68.0/255/0, blue: 68.0/255/0, alpha: 1.0)
        messageAttrString.addAttribute(NSAttributedString.Key.foregroundColor,
                                       value: messageTitleColor,
                                       range: NSRange(location: 0, length: message!.count))
        setValue(messageAttrString, forKey: "attributedMessage")
    }
    
    func applyNoActionBranding() {
        let font = [kCTFontAttributeName: UIFont(name: "Montserrat-Medium", size: 16.0)!]
        for actionButton in actions {
            let titleAttrString = NSMutableAttributedString(string: actionButton.title!, attributes: font as [NSAttributedString.Key : Any])
            actionButton.setValue(titleAttrString, forKey: "attributedTitleForAction")
        }
    }
    
    func applyYesActionBranding() {
        let font = [kCTFontAttributeName: UIFont(name: "Montserrat-Regular", size: 16.0)!]
        for actionButton in actions {
            let titleAttrString = NSMutableAttributedString(string: actionButton.title!, attributes: font as [NSAttributedString.Key : Any])
            actionButton.setValue(titleAttrString, forKey: "attributedTitleForAction")
        }
    }
}



 

2nd call those AlertView functions where ever you need. For example call in ViewDidLoad()

override func viewDidLoad() {
    super.viewDidLoad()

    showAlert()
}

func showAlert() {

    let alertVc = UIAlertController(title: "Some Title", message: "Some message", preferredStyle: .alert)
    
    //No action
    let noAction = UIAlertAction(title: "No", style: .default, handler: {
        (alert: UIAlertAction!) -> Void in
        alertVc.dismiss(animated: true, completion: nil)
    })
    
    //Yes action
    let yesAction = UIAlertAction(title: "Yes", style: .default, handler: {
        (alert: UIAlertAction!) -> Void in
        self.deleteFunction(address)
        alertVc.dismiss(animated: true, completion: nil)
    })
    
    alertVc.applyBranding()
    alertVc.applyNoActionBranding()
    alertVc.applyYesActionBranding()
    alertVc.addAction(noAction)
    alertVc.addAction(yesAction)
    
    alertVc.view.tintColor = .blue
    DispatchQueue.main.async(execute: {
        self.present(alertVc, animated: true, completion: nil)
    })
}

Hope It's work for all