在SwiftUI中预览小部件UI

import SwiftUI
import PlaygroundSupport

struct MyWidget_Previews: PreviewProvider {
    static var previews: some View {
        // 在此处编写预览代码
    }
}

Text("Hello, SwiftUI!")

.previewDevice(PreviewDevice(rawValue: "iPhone 12 Pro Max"))
.colorScheme(.dark)

.previewLayout(.fixed(width: 400, height: 200))

struct MyWidget_Previews: PreviewProvider {
    static var previews: some View {
        Text("Hello, SwiftUI!")
            .previewDevice(PreviewDevice(rawValue: "iPhone 12 Pro Max"))
            .colorScheme(.dark)
            .previewLayout(.fixed(width: 400, height: 200))
    }
}