Dark mode in SwiftUI Preview doesn't have a dark background with Xcode 11.4

Question

Does anyone have the same problem, that Xcode (11.4) doesn't show a dark background, when previewing in dark mode?

Steps to reproduce:

1) Create a new project, a Single View App

2) Add the .environment-modifier to the preview:

Group {
    ContentView()
        .environment(\.colorScheme, .light)
    ContentView()
        .environment(\.colorScheme, .dark)
}

You get this result:

Maybe that helps you stackoverflow.com/questions/56591669/… — davidev
– davidev, Commented Mar 29, 2020 at 9:23
The current accepted answer is out of date, so I think mine should be the accepted one now. — Curiosity
– Curiosity, Commented Jan 26, 2021 at 0:39

Curiosity · Accepted Answer · 2020-06-08 04:42:18Z

22

Setting \.colorScheme in the environment is deprecated, so instead use the .preferedColorScheme modifier. For example,

ContentView()
    .preferredColorScheme(.dark)

answered Jun 8, 2020 at 4:42

Curiosity

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2 Comments

Peter Schorn Over a year ago

How have I not seen this before? I just went through a bunch of effect implementing my own custom function for adding a dark mode to a view.

dohpaz42 Over a year ago

This should be the selected answer. Everything else, assuming it works, is overkill; especially for a preview mode.

bemental · Accepted Answer · 2020-09-07 09:37:15Z

0

As m-reza-f mentioned in a similar question, this is a bug in Xcode (which is still active as this answer is posted).

I'll add that instead of wrapping your actual body code in a NavigationView, you can simply wrap the previews code in your PreviewProvider in a NavigationView instead, to achieve the same results:

struct ContentView_Previews: PreviewProvider {
     Group {
          NavigationView {
               ContentView()
                    .environment(\.colorScheme, .light)
          }

          NavigationView {
               ContentView()
                    .environment(\.colorScheme, .light)
          }
     }
}

answered Sep 7, 2020 at 9:37

bemental

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1 Comment

bemental Over a year ago

Looks like Austin Conlon's answer is probably more appropriate since it actually solves the problem. First time I've seen it as a suggested solution!

Chris · Accepted Answer · 2020-03-29 10:07:56Z

-1

try this:

@available(iOS 13.0, *)
public struct DarkView<Content> : View where Content : View {
    var darkContent: Content
    var on: Bool
    public init(_ on: Bool, @ViewBuilder content: () -> Content) {
        self.darkContent = content()
        self.on = on
    }

    public var body: some View {
        ZStack {
            if on {
                Spacer()
                    .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity)
                    .background(Color.black)
                    .edgesIgnoringSafeArea(.all)
                darkContent.frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity).background(Color.black).colorScheme(.dark)
            } else {
                darkContent
            }
        }
    }
}

@available(iOS 13.0, *)
extension View {
    @available(iOS 13.0, *)
    public func darkModeFix(_ on: Bool = true) -> DarkView<Self> {
        DarkView(on) {
            self
        }
    }
}

and then

yourView()
.environment(\.colorScheme, .dark)
                    .darkModeFix()

answered Mar 29, 2020 at 10:07

Chris

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1 Comment

Lupurus Over a year ago

Thanks! But why the var on: Bool? This property is completely useless ;)

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