【Swift】テキストの一部だけ色を変える方法！AttributedString構造体の使い方

var attributedString = AttributedString("Let's learn Swift and make an iOS app!\nLet's output Hello world right away!")
        
if let range = attributedString.range(of: "Hello world") {
    attributedString[range].foregroundColor = .cyan
}

import SwiftUI

struct ContentView: View {

    private func changeStringColor(_ text: String) -> AttributedString {
        var attributedString = AttributedString(text)
        
        if let range = attributedString.range(of: "Hello world") {
            attributedString[range].foregroundColor = .cyan
        }
        return attributedString
    }
    
    var body: some View {
        Text(changeStringColor("Let's learn Swift and make an iOS app!\nLet's output Hello world right away!"))
    }
}

var str:String = "Hello World!!"
var attributedString = AttributedString(str)
print(type(of: attributedString)) // AttributedString