Snippet: SwiftUI View printMessage extension

Just a simple utility to print a string in the middle of a view chain when doing SwiftUI (pardon narrow formatting for blog):

extension View {
  func printMessage(_ msg: Any...,
              separator: String = " ",
              terminator: String = "\n")
            -> some View {
    // Print them out as if not
    // converted to an array.
    for m in msg {
            terminator: "")
    return self

Use like this:

import SwiftUI
import PlaygroundSupport

struct ContentView: View {
  var body: some View {
    VStack {
      TestView(label: "hello", idx: 22)
      TestView(label: "hello", idx: 24)

struct TestView: View {
  let label: String
  let idx: Int

  var body: some View {
      .printMessage("\(self.label):", "\(self.idx)")
     // or: .printMessage(self.label, self.idx)

PlaygroundPage.current.liveView = UIHostingController(rootView: ContentView())
// In a Swift playground the output is:

hello: 22
hello: 24
hello: 22
hello: 24
hello: 22
hello: 24

Gist here.


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: