Change title and message font of alert using UIAlertController in Swift

Question

I am trying to change the title and message font for an alert shown using UIAlertController I am trying to do using an NSAttributedStirng, but it gives compiler error that a NSAttributed string cannot be taken instead of Stirng I tried something similar to this

var title_attrs = [NSFontAttributeName : CustomFonts.HELVETICA_NEUE_MEDIUM_16]
var msg_attrs = [NSFontAttributeName : CustomFonts.HELVETICA_NEUE_REGULAR_14]
var title = NSMutableAttributedString(string:"Done", attributes:title_attrs)

var msg = NSMutableAttributedString(string:"The job is done ", attributes:msg_attrs)
let alertController = UIAlertController(title: title, message: title , preferredStyle: UIAlertControllerStyle.Alert)

Can someone guide me how can I achieve this?

score 7 · Answer 1 · answered Jul 16 '17 at 10:50

7

Swift 3 Version:

extension UIAlertController {
    func changeFont(view: UIView, font:UIFont) {
        for item in view.subviews {
            if item.isKind(of: UICollectionView.self) {
                let col = item as! UICollectionView
                for  row in col.subviews{
                    changeFont(view: row, font: font)
                }
            }
            if item.isKind(of: UILabel.self) {
                let label = item as! UILabel
                label.font = font
            }else {
                changeFont(view: item, font: font)
            }

        }
    }

    open override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()
        let font = YOUR_FONT
        changeFont(view: self.view, font: font! )
    }
}

answered Jul 16 '17 at 10:50

Maysam

7,246
13
68
106

You saved my life! – Ahmadreza Mar 30 '18 at 17:32
Code is woking as I excepted but small issue is, When i tap and drag my finger down, it will again goes to default font size. Any idea? – Sudhakar Sep 14 '18 at 06:44
The problem of This approach is there is no difference between title and message label text sizes. – Sabrina Mar 07 '19 at 12:54
You can check label's font point size, and change the font accordingly. – Maysam Mar 07 '19 at 12:56
I tried this solution to increase font size on iPad. It's work fine, but alert showing with very small width. How to increase alert width? – Kien Vu Oct 22 '19 at 18:05
@tdtkien if you mean the width of presented alert view, i'm afraid you cannot. – Maysam Oct 23 '19 at 19:08

Tom · Accepted Answer · 2014-11-06T13:50:50.717

4

I think Apple removed the attributedTitle and -message from the API. It was never part of the public API so it might be that Apple will not allow your app in the app store if you used it.

You should use the UIAlertController as is. If you want to customise it a bit see this NSHipster post. If you want more control, create a custom View to display.

edited Nov 06 '14 at 13:50

answered Nov 06 '14 at 13:43

Tom

874
7
13

Hamed · Answer 3 · 2018-06-23T07:52:52.467

1

    let myString  = "Alert Title"
    var myMutableString = NSMutableAttributedString()
    myMutableString = NSMutableAttributedString(string: myString as String, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: 18.0)!])
    myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(), range: NSRange(location:0,length:myString.characters.count))
    alertController.setValue(myMutableString, forKey: "attributedTitle")
    alertController.setValue(myMutableString, forKey: "attributedMessage")

edited Jun 23 '18 at 07:52

answered Jun 19 '17 at 08:30

Hamed

1,678
18
30

It leads to crash for me on Swift 5 – Ahmadreza May 24 '20 at 09:19

score 0 · Answer 4 · answered Jul 27 '16 at 07:27

extension UIAlertController {
    func changeFont(view:UIView,font:UIFont) {
        for item in view.subviews {
            if item.isKindOfClass(UICollectionView) {
                let col = item as! UICollectionView
                for  row in col.subviews{
                    changeFont(row, font: font)
                }
            }
            if item.isKindOfClass(UILabel) {
                let label = item as! UILabel
                label.font = font
            }else {
                changeFont(item, font: font)
            }

        }
    }
    public override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()
        let font = UIFont(name: YourFontName, size: YourFontSize)
        changeFont(self.view, font: font! )
    }
}

Change title and message font of alert using UIAlertController in Swift

4 Answers4

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