create a view with a red background of size 100 by 100 in swiftui in swift

You can create a view with a red background of size 100 by 100 by using the Color and frame modifiers in SwiftUI as shown below:

main.swift
import SwiftUI

struct RedView: View {
    var body: some View {
        Color.red
            .frame(width: 100, height: 100)
    }
}
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This creates a RedView struct which is a SwiftUI View that displays a red background color of size 100 by 100. You can then use this view in your SwiftUI hierarchy by adding it to a parent view, like this:

main.swift
struct ContentView: View {
    var body: some View {
        VStack {
            Text("Hello, World!")
            RedView()
        }
    }
}
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This adds the RedView to a VStack along with some text, and displays it on the screen.

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