Swift: Determine iOS Screen size

Question

I would like to use Swift code to properly position items in my app for no matter what the screen size is. For example, if I want a button to be 75% of the screen wide, I could do something like (screenWidth * .75) to be the width of the button. I have found that this could be determined in Objective-C by doing

CGFloat screenWidth = screenSize.width;
CGFloat screenHeight = screenSize.height;

Unfortunately, I am unsure of how to convert this to Swift. Does anyone have an idea?

Thanks!

score 802 · Accepted Answer · edited Feb 14 '23 at 03:49

802

In Swift 5.0

let screenSize: CGRect = UIScreen.main.bounds

Pay attention that UIScreen.main will be deprecated in future version of iOS. So we can use view.window.windowScene.screen.

Swift 4.0

// Screen width.
public var screenWidth: CGFloat {
    return UIScreen.main.bounds.width
}

// Screen height.
public var screenHeight: CGFloat {
    return UIScreen.main.bounds.height
}

In Swift 3.0

let screenSize = UIScreen.main.bounds
let screenWidth = screenSize.width
let screenHeight = screenSize.height

In older swift:
Do something like this:

let screenSize: CGRect = UIScreen.mainScreen().bounds

then you can access the width and height like this:

let screenWidth = screenSize.width
let screenHeight = screenSize.height

if you want 75% of your screen's width you can go:

let screenWidth = screenSize.width * 0.75

edited Feb 14 '23 at 03:49

Taras

1,485
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answered Jun 08 '14 at 21:05

Goppinath

10,569
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3

Of course you don't need the semi-colons (I know the habit from years of C coding :-) ) and you can omit :CGRect and write let screenSize = UIScreen.mainScreen().bounds and screenSize will infer the type from the assignment. – clearlight Jan 26 '15 at 21:54
7

one must be careful since this solution doesn't take a device orientation into account. in landscape width and height are swapped – heximal Sep 15 '15 at 11:36
1

how can we adjust the size if the device is rotated – SwiftER Aug 26 '16 at 16:35
1

@pprevalon if width < height – Un3qual Aug 29 '16 at 20:53
19

Swift 3 is UIScreen.main.bounds, not UIScreen.main().bounds – Mahesh Oct 14 '16 at 04:08
let screenHeight = UIScreen.main.bounds.height – Saurabh Nov 30 '16 at 20:47
it should be let screenWidth = screenSize.size.width let screenHeight = screenSize.size.height – vidalbenjoe May 17 '17 at 05:13
Use of unresolved identifier 'UIScreen'.... how do I get access to that class? I'm new to swift – Robbie Jan 15 '20 at 23:03
@Robbie Did you import `UIKit`? I think that you have imported `Foundation`. – Goppinath Jan 17 '20 at 12:34
Thanks goppinath... new to all these imports. now I'm starting to get it – Robbie Jan 18 '20 at 06:16
3

This does not work with Split View. The app is in Split View yet still returns as if it's taking the full screen of the iPad. – Hedylove Mar 28 '20 at 21:45
It seems that `UIScreen.main.bounds` is deprecated, anyone have an alternative, please? – Petchav Oct 27 '22 at 12:09

Swift: Determine iOS Screen size

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