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

Use NSMutableAttributedString set the font size and color, use this below code,

UIAlertController *controller = [UIAlertController alertControllerWithTitle:@"Do you wish to logout?" message:@"" preferredStyle:UIAlertControllerStyleAlert];

NSMutableAttributedString *hogan = [[NSMutableAttributedString alloc] initWithString:@"Do you wish to logout?"];

[hogan addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:50.0] range:NSMakeRange(24, 11)];

[hogan addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0,35)];

[controller setValue:hogan forKey:@"attributedTitle"];

UIAlertAction *logOut = [UIAlertAction actionWithTitle:@"Log Out" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {}];

hope its helpful

Answer 2

I've written an extension

extension UIAlertController{
    open override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()

        for i in self.actions {
            let attributedText = NSAttributedString(string: i.title ?? "", attributes: [NSAttributedString.Key.font : UIFont(name: "SFProText-Semibold", size: 20.0)!])

            guard let label = (i.value(forKey: "__representer") as AnyObject).value(forKey: "label") as? UILabel else { return }
            label.attributedText = attributedText
        }

    }
}

Answer 3

Try this:

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Do you wish to logout?" message:@"abcd" preferredStyle:UIAlertControllerStyleActionSheet];

NSMutableAttributedString *xyz = [[NSMutableAttributedString alloc] initWithString:@"pqrs"];

[xyz addAttribute:NSFontAttributeName
              value:[UIFont systemFontOfSize:30.0]
              range:NSMakeRange(20, 15)];
[alert setValue:xyz forKey:@"attributedTitle"];



UIAlertAction *logout = [UIAlertAction actionWithTitle:@"logout" 
                                        style:UIAlertActionStyleDefault
                                        handler:^(UIAlertAction *action){
                                                    //your code for handling this
}];
UIImage *Image = [UIImage imageNamed:@"yourImage"];
[logout setValue:accessoryImage forKey:@"image"];

Answer 4

Changing the color is pretty simple.

You could just change the tintColor of the underlying view, however, due to a known bug introduced in iOS 9 (https://openradar.appspot.com/22209332), the tintColor is overridden by the application window's tintColor.

See my full answer to: How to change tint color of UIAlertController

You shouldn't change the UIAlertController font. However it still can be done, see this answer

Answer 5

You can update text color using

       UIAlertAction *myGoalAction = [UIAlertAction
                                    actionWithTitle:NSLocalizedString(@"My Title", @"My Title")
                                    style:UIAlertActionStyleDefault
                                    handler:^(UIAlertAction *action)
                                    {

                                    }];
       [myGoalAction setValue:[UIColor greenColor] forKey:@"titleTextColor"];

There is no efficient way to update font size.I will suggest you to use standard font size.

UIAlertAction title label is private variable and not accessible directly. Label comes inside 3 level private view hierarchy. Showing logout action with bigger font make sense for app.

There are many open source solution available.I will recommend to try this

Answer 6

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