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, Sep 09 '18 at 07:21

score 690 · Accepted Answer · edited Oct 22 '19 at 08:55

690

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 '19 at 08:55

PhillipJacobs

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answered Jun 23 '14 at 00:07

Connor Pearson

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5

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. – Jay Jun 23 '14 at 00:19
1

Are you setting the font to 17 anywhere? Storyboard? – Connor Pearson Jun 23 '14 at 00:31
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I ran it on my iPhone 5 and your code works. It must be a bug in the simulator. – Jay Jun 23 '14 at 00:34
That's interesting. Not really surprised to see another bug though. Glad it's working – Connor Pearson Jun 23 '14 at 00:35
7

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. – Andrew Plummer May 28 '15 at 11:58
This is good for iOS developers, but for the sake of those googling this question, I will add the note that UIFont does not exist on OSX's version of Cocoa. On OS X you'll want something like label.font=NSFont(name: label.font.fontName, size: 20) – Michael Stern Sep 29 '15 at 02:12
regarding the "17", perhaps that was simply **autoshrink** working. – Fattie Jun 28 '16 at 19:29
How do you change the font size for the label in table cells? – Eshwaren Manoharen Mar 02 '17 at 07:53
extension UILabel{ func font(size: CGFloat){ self.font = UIFont(descriptor: self.font.fontDescriptor, size: size) } } – Mohammad Razipour Sep 09 '18 at 07:21
`label.font = UIFont(name:"fontname", size: 20.0)` doesn't do anything in Swift 5 (at least in the emulator, can't test with a real iOS device), use `label.font = label.font.withSize(20)` instead. – Neph Apr 25 '19 at 13:30

score 73 · Answer 2 · edited Feb 19 '17 at 12:21

73

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 '17 at 12:21

Hamish

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answered Oct 31 '14 at 07:13

mouselangelo

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score 40 · Answer 3 · answered Jan 30 '15 at 16:48

40

label.font = UIFont.systemFontOfSize(20)

answered Jan 30 '15 at 16:48

ma11hew28

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label.font = UIFont.systemFont(ofSize: 20) // in swift 3 – Pokemon Feb 16 '17 at 08:02
This solution will not work for custom fonts. It will always return system font. – Awais Fayyaz Feb 25 '19 at 11:27

score 24 · Answer 4 · answered Nov 03 '15 at 10:23

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 03 '15 at 10:23

Gautam Sareriya

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YanSte · Answer 5 · 2015-01-17T19:13:20.963

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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 '15 at 19:13

answered Jan 17 '15 at 18:58

YanSte

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This helped me. I changed the font size, its working in swift 4. – R. Mohan Apr 09 '18 at 08:22

score 6 · Answer 6 · edited Aug 05 '15 at 04:57

6

You can give like this also

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

edited Aug 05 '15 at 04:57

Dharmesh Kheni

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answered Oct 27 '14 at 13:33

Santo

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score 5 · Answer 7 · answered Oct 23 '16 at 19:41

5

In Swift 3 again...

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

answered Oct 23 '16 at 19:41

ICL1901

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score 4 · Answer 8 · answered Feb 10 '20 at 19:33

4

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

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

answered Feb 10 '20 at 19:33

fullmoon

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score 3 · Answer 9 · answered Feb 04 '17 at 09:16

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 04 '17 at 09:16

Dilip Jangid

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score 3 · Answer 10 · answered May 18 '17 at 07:35

3

Swift-3.1

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

answered May 18 '17 at 07:35

aqsa arshad

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lhmgrassi · Answer 11 · 2017-10-06T11:50:31.133

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 06 '17 at 11:50

answered Oct 06 '17 at 11:43

lhmgrassi

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score 2 · Answer 12 · answered Jan 02 '18 at 19:33

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 02 '18 at 19:33

Chosen

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score 2 · Answer 13 · answered Jan 01 '19 at 05:55

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

score 2 · Answer 14 · answered May 22 '19 at 19:13

2

Swift 4.2

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

answered May 22 '19 at 19:13

Elshad Karimov

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score 1 · Answer 15 · answered Sep 06 '16 at 17:05

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 06 '16 at 17:05

Ikhsan Assaat

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score 1 · Answer 16 · answered Oct 13 '16 at 18:08

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 '16 at 18:08

Casey Murray

1,582
17
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I think you forgot label.font – Ethan Parker Jan 15 '17 at 00:49

score 0 · Answer 17 · answered Mar 16 '17 at 07:51

0

Swift 3

label.font.withSize(16)

answered Mar 16 '17 at 07:51

matt

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score 0 · Answer 18 · answered Mar 26 '17 at 13:12

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()
        }
    }
}

score 0 · Answer 19 · answered Jun 28 '19 at 13:08

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 '19 at 13:08

ZahraAsgharzade

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score -1 · Answer 20 · answered May 09 '17 at 07:52

-1

SWIFT 3.1

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

answered May 09 '17 at 07:52

Ittai Oren

542
5
10

This is not correct, and is not written using Cocoa naming conventions. – Womble Mar 22 '18 at 00:40

score -1 · Answer 21 · answered Jul 13 '17 at 17:57

-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 '17 at 17:57

Fangming

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

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