SwiftUI: How can I get the width of a device?

Question

I am trying to add padding to the left and right of a Text() view only. Ideally I would like to set it's width equal to the width of the device minus a constant I define.

For example:

Text("My text view here")
   .frame(width: device.width - 16)

What is the correct way to do this in SwiftUI? Am I approaching this the wrong way?

Community · Accepted Answer · 2020-06-20 09:12:55Z

4

SwiftUI Standard way

GeometryReader is the type that gives you all information about the parent view

So you can use GeometryReader like:

    var body: some View {
        GeometryReader { geometry in
            Text("My text view here")
                .frame(width: geometry.size.width - 16)
                .background(Color.red) // This is just to see how it looks like
        }
    }

UIKit Aggressive way

You can get it directly from the device:

    var body: some View {
        Text("My text view here")
            .frame(width: UIScreen.main.bounds.width - 16)
            .background(Color.red) // This is just to see how it looks like
    }

_{Note that device width is physical and not updating on rotation. Also I haven't experimented with it to see myself, but I have read the UIScreen runs into problems on SplitView.}

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Nov 22, 2019 at 17:08

Mojtaba Hosseini

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6 Comments

Steven Schafer Over a year ago

Interesting - So you need to wrap the view in a GeometryReader in order to even get the width? This looks fairly inefficient.

Mojtaba Hosseini Over a year ago

It would be better to be something like an environment variable I think but this is how it works.

Mojtaba Hosseini Over a year ago

I added another way @StevenSchafer. Check that out.

Steven Schafer Over a year ago

your second answer is what I would expect to be able to do. Thanks!

0101 Over a year ago

He asked about width of device not the parent's view

|

Fry · Accepted Answer · 2019-11-22 17:09:07Z

0

Try setting the frame to the full width of the screen (maxWidth: .infinity) and then adding horizontal padding.

Text("My text view here")
        .frame(maxWidth: .infinity)
        .padding(.horizontal, 16)

answered Nov 22, 2019 at 17:09

Fry

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Comments

Steven Schafer · Accepted Answer · 2019-11-22 17:05:00Z

-1

An alternate way to achieve the same thing is .padding(.horizontal, 16)

answered Nov 22, 2019 at 17:05

Steven Schafer

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