【SwiftUI】task の id を使って処理を何度も繰り返す 👉 https://android.benigumo.com/20240326/task-id/

TestTaskID.swift

import SwiftUI

struct TestTaskID: View {
  @State private var text = ""
  @State private var taskID = UUID()

  var body: some View {
    Text("\(text)")
      .task(id: taskID) { // *
        let url = URL(string: "https://worldtimeapi.org/api/timezone/Asia/Tokyo.txt")!
        do {
          var lines: [String] = []
          for try await line in url.lines {
            lines.append(line)
          }
          text = String(lines[2].components(separatedBy: "T")[1])
        } catch {
          text = "Faild to load."
        }
      }
    Button("RELOAD") {
      taskID = UUID()
    }
    .buttonStyle(.borderedProminent)
  }
}

#Preview {
  TestTaskID()
}