AsyncAction.swift

import SwiftUI

struct AsyncAction<Content: View>: View {
  @State var isLoading = false
  @State var task: @Sendable @MainActor () async -> Void
  @ViewBuilder let content: (Bool, @escaping () -> Void) -> Content

  var body: some View {
    content(isLoading, {
      if isLoading {
        return
      }
      
      isLoading = true
      Task { @MainActor in
        await task()
        isLoading = false
      }
    })
  }
}

Example:

AsyncAction {
  do {
     try await doSomething1()
     try await doSomething2()
  } catch {
    self.error = error
  }
} content: { isLoading, action in
  Button {
    action()
  } label: {
    Text("Example")
  }
  .loading(isLoading: isLoading)
}
.alert(error: $error)