How do I change the font size of a UILabel in Swift?

Question

label.font.pointSize is read-only, so I'm not sure how to change it.

extension UILabel{ func font(size: CGFloat){ self.font = UIFont(descriptor: self.font.fontDescriptor, size: size) } } — Mohammad Razipour
– Mohammad Razipour, Commented Sep 9, 2018 at 7:21

PhillipJacobs · Accepted Answer · 2019-10-22 08:55:49Z

697

You can do it like this:

label.font = UIFont(name: label.font.fontName, size: 20)

Or like this:

label.font = label.font.withSize(20)

This will use the same font. 20 can be whatever size you want of course.

Note: The latter option will overwrite the current font weight to regular so if you want to preserve the font weight use the first option.

Swift 3 Update:

label.font = label.font.withSize(20)

Swift 4 Update:

label.font = label.font.withSize(20)

or

label.font = UIFont(name:"fontname", size: 20.0)

and if you use the system fonts

label.font = UIFont.systemFont(ofSize: 20.0)
label.font = UIFont.boldSystemFont(ofSize: 20.0)
label.font = UIFont.italicSystemFont(ofSize: 20.0)

edited Oct 22, 2019 at 8:55

PhillipJacobs

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answered Jun 23, 2014 at 0:07

Connor

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10 Comments

Jay Over a year ago

This does in-fact change the pointSize property the font. However, the pointSize gets immediately reset to 17.0 before the label gets redrawn. So there's a bit more to it than that to actually see a different font size on the screen.

Connor Over a year ago

Are you setting the font to 17 anywhere? Storyboard?

Jay Over a year ago

I ran it on my iPhone 5 and your code works. It must be a bug in the simulator.

Connor Over a year ago

That's interesting. Not really surprised to see another bug though. Glad it's working

Andrew Plummer Over a year ago

There's seriously something wrong with documentation when i just googled this instead of just looking it up because I knew it would be faster.

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Hamish · Accepted Answer · 2017-02-19 12:21:13Z

74

I think the best way to do this - if keeping the same font that is already assigned to the UILabel would be:

(using Swift)

label.font = label.font.fontWithSize(20)

(using Swift 3)

label.font = label.font.withSize(20)

Ideally I would set this in the viewDidLayoutSubviews method, as it doesn't need to change every time the view appears.

edited Feb 19, 2017 at 12:21

Hamish

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answered Oct 31, 2014 at 7:13

mouselangelo

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Comments

ma11hew28 · Accepted Answer · 2015-01-30 16:48:19Z

40

label.font = UIFont.systemFontOfSize(20)

answered Jan 30, 2015 at 16:48

ma11hew28

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2 Comments

Pokemon Over a year ago

label.font = UIFont.systemFont(ofSize: 20) // in swift 3

Awais Fayyaz Over a year ago

This solution will not work for custom fonts. It will always return system font.

Gautam Sareriya · Accepted Answer · 2015-11-03 10:23:55Z

24

We can set font as per our requirement like,

label.font = UIFont(name: "Avenir-Light", size: 15.0)
label.font = UIFont.boldSystemFontOfSize(15)
label.font = UIFont.italicSystemFontOfSize(15)
label.font = UIFont.systemFontOfSize(17)

answered Nov 3, 2015 at 10:23

Gautam Sareriya

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Comments

YanSte · Accepted Answer · 2015-01-17 19:13:20Z

10

If you want just change size of your font i create this extension

// Add extension

extension UILabel {
    func setSizeFont (sizeFont: Double) {
        self.font =  UIFont(name: self.font.fontName, size: sizeFont)!
        self.sizeToFit()
    }
}

// Use

myLabel.setSizeFont(60)

edited Jan 17, 2015 at 19:13

answered Jan 17, 2015 at 18:58

YanSte

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1 Comment

Mohan Ramanathan Over a year ago

This helped me. I changed the font size, its working in swift 4.

Dharmesh Kheni · Accepted Answer · 2015-08-05 04:57:16Z

6

You can give like this also

labelName.font = UIFont(name: "systemFont", size: 30)

edited Aug 5, 2015 at 4:57

Dharmesh Kheni

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answered Oct 27, 2014 at 13:33

Santo

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Comments

ICL1901 · Accepted Answer · 2016-10-23 19:41:31Z

5

In Swift 3 again...

myLabel.font = myLabel.font.withSize(18)

answered Oct 23, 2016 at 19:41

ICL1901

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Comments

Badr Bujbara · Accepted Answer · 2020-02-10 19:33:30Z

4

In case you want to use custom font with bold option:

nameLabel.font = UIFont(name: "GillSans-Bold", size: 27)

answered Feb 10, 2020 at 19:33

Badr Bujbara

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Comments

Dilip Jangid · Accepted Answer · 2017-02-04 09:16:05Z

3

In swift3, suppose your UILable name is myLable and you want to change its font size do this

myLable.font = UIFont.systemFont(ofSize: 10)

answered Feb 4, 2017 at 9:16

Dilip Jangid

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Comments

aqsa arshad · Accepted Answer · 2017-05-18 07:35:11Z

3

Swift-3.1

label.font = UIFont.systemFont(ofSize: 12)

answered May 18, 2017 at 7:35

aqsa arshad

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Comments

lhmgrassi · Accepted Answer · 2017-10-06 11:50:31Z

2

You can use an extension.

import UIKit

extension UILabel {

    func sizeFont(_ size: CGFloat) {
        self.font = self.font.withSize(size)
    }
}

To use it:

self.myLabel.fontSize(100)

edited Oct 6, 2017 at 11:50

answered Oct 6, 2017 at 11:43

lhmgrassi

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Comments

Chosen · Accepted Answer · 2018-01-02 19:33:42Z

2

Apple keep changing things for no reason: Swift 4+:

myLabel.font = UIFont.systemFont(ofSize: 16)

thanks apple for wasting people time to figure out what "font size" methods they need to use!

answered Jan 2, 2018 at 19:33

Chosen

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Comments

Naresh · Accepted Answer · 2019-01-01 05:55:21Z

Programmatically

label.font = UIFont.systemFont(ofSize: 20.0)
label.font = UIFont.boldSystemFont(ofSize: 20.0)
label.font = UIFont.italicSystemFont(ofSize: 20.0)

label.font = UIFont(name:"Helvetica Neue", size: 20.0)//Set your font name here

Through Story board

To display multiple lines set 0(Zero), this will display more than one line in your label.

If you want to display only 2 lines set 2.

If you want to set minimum font size for label Click Autoshrink and Select Minimum Font Size option

See below screens

Here set minimum font size

EX: 9 (In this image)

If your label get more text at that time your label text will be shrink upto 9

Elshad Karimov · Accepted Answer · 2019-05-22 19:13:46Z

2

Swift 4.2

myLabel.font = UIFont.systemFont(ofSize: 12)

answered May 22, 2019 at 19:13

Elshad Karimov

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Comments

Ikhsan Assaat · Accepted Answer · 2016-09-06 17:05:52Z

1

I used fontWithSize for a label with light system font, but it changes back to normal system font.

If you want to keep the font's traits, better to include the descriptors.

label.font = UIFont(descriptor: label.font.fontDescriptor(), size: 16.0)

answered Sep 6, 2016 at 17:05

Ikhsan Assaat

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Comments

Casey Murray · Accepted Answer · 2016-10-13 18:08:02Z

1

In Swift 3:

label = UIFont.systemFont(ofSize: 20)

and to use system preset sizes, for example:

label = UIFont.systemFont(ofSize: UIFont.smallSystemFontSize)

answered Oct 13, 2016 at 18:08

Casey Murray

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1 Comment

Ethan Parker Over a year ago

I think you forgot label.font

matt · Accepted Answer · 2017-03-16 07:51:16Z

0

Swift 3

label.font.withSize(16)

answered Mar 16, 2017 at 7:51

matt

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Comments

Adam Smaka · Accepted Answer · 2017-03-26 13:12:56Z

0

Swift 3.1

import UIKit

extension UILabel {
    var fontSize: CGFloat {
        get {
            return self.font.pointSize
        }
        set {
            self.font =  UIFont(name: self.font.fontName, size: newValue)!
            self.sizeToFit()
        }
    }
}

answered Mar 26, 2017 at 13:12

Adam Smaka

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Comments

ZahraAsgharzade · Accepted Answer · 2019-06-28 13:08:47Z

0

swift 4:

label.font = UIFont("your font name", size: 15)

also if you want to set the label font in all views in your project try this in appDelegate>didFinishLaunch: UILabel.appearance().font = UIFont("your font name", size: 15)

answered Jun 28, 2019 at 13:08

ZahraAsgharzade

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Comments

Ittai Oren · Accepted Answer · 2017-05-09 07:52:11Z

-1

SWIFT 3.1

Label.font = Label.font.withSize(NewValue)

answered May 9, 2017 at 7:52

Ittai Oren

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1 Comment

Womble Over a year ago

This is not correct, and is not written using Cocoa naming conventions.

Fangming · Accepted Answer · 2017-07-13 17:57:52Z

-1

It's very easy and convenient to change font size from storyboard, and you can instantly see the result of the change.

Actually, it's also very easy to change other font attributes on storyboard too, like style, font family, etc.

answered Jul 13, 2017 at 17:57

Fangming

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