SwiftUI Widget iOS 14 gradient issue

Question

I want to create a gradient color for my widget using custom colors. And I have a problem when I only use two colors, as a result, not one of the colors is applied, but the background turns green!

struct WeatherWidgetMediumView: View {
    
    var gradient: LinearGradient {
        LinearGradient(
            gradient: Gradient(
                colors:
                [
                    Color(red: 96.0/255.0, green: 171.0/255.0, blue: 239.0/255.0),
                    Color(red: 163.0/255.0, green: 230.0/255.0, blue: 244.0/255.0)
                ]),
            startPoint: .top,
            endPoint: .bottom)
    }
    
    var body: some View {
        GeometryReader { geo in
            HStack(alignment: .center) {
                Divider().background(Color.black).padding(.vertical, 16.0).opacity(0.1)
            }
        }
        .background(gradient)
    }
}

But If I added one more color it's looks great.

struct WeatherWidgetMediumView: View {
    let weather: Weather
    
    var gradient: LinearGradient {
        LinearGradient(
            gradient: Gradient(
                colors:
                [
                    Color(red: 96.0/255.0, green: 171.0/255.0, blue: 239.0/255.0),
                    Color(red: 96.0/255.0, green: 171.0/255.0, blue: 239.0/255.0),
                    Color(red: 163.0/255.0, green: 230.0/255.0, blue: 244.0/255.0)
                ]),
            startPoint: .top,
            endPoint: .bottom)
    }
    
    var body: some View {
        GeometryReader { geo in
            HStack(alignment: .center) {
                Divider().background(Color.black).padding(.vertical, 16.0).opacity(0.1)
            }
            Spacer()
        }
        .background(gradient)
    }
}

UPD: Create a GitHub project with this issue

https://github.com/Maxim-Zakopaylov/widgetKitGradientIssue

Answer 1

I've faced the exact issue in my app, and I've fixed it by adding .blendMode(.darken) after the background modifier. I hope that would solve your problem too.

Answer 2

This code shows a bug with gradient colors which is happening using Widgets extension for iOS 14

LinearGradient(gradient: Gradient(colors: [ Color(red: 0, green: 0.569, blue: 0.945), Color(red: 0, green: 0.329, blue: 0.953)]), startPoint: .top, endPoint: .bottom)

Also all three gradient types conform to the ShapeStyle protocol, you can use them for backgrounds, fills, and strokes. For example, this uses our rainbow conical gradient as a thick inner stroke for a circle:

Circle()
    .strokeBorder(
        AngularGradient(gradient: Gradient(colors: [.red, .yellow, .green, .blue, .purple, .red]), center: .center, startAngle: .zero, endAngle: .degrees(360)),
        lineWidth: 50
    )
    .frame(width: 200, height: 200)

Answer 3

Here's a way to use Faisal's finding without affecting dark mode behavior in release builds.

/// Work around Xcode bug where SwiftUI gradients show up as green in the Simulator
let workAroundBlendMode: BlendMode = {
    #if targetEnvironment(simulator)
    return BlendMode.plusDarker
    #else
    return BlendMode.normal
    #endif
}()

Then use this with a blendMode modifier on your gradient:

RadialGradient(...)
    .blendMode(workAroundBlendMode)