Swift println command does not output in console

Question

Using a playground file in Xcode 6 beta, I am trying to get an output in the console for the println command. I have written println("test"), opened the Assistant Editor (View\Assistant Editor\Show Assistant Editor) and see that little window named "Console output", but still I get nothing. I have also tried to close and restart Xcode.

What am I doing wrong?

Yep, I've run into this myself and I just don't think the playground supports sending output to the standard output. Fortunately, it's easy to create a console app to test stuff, which is what I did. — Alvin Thompson, Jun 25 '14 at 15:10
@connor Yes, I have exactly what *x43x61x6* has written below. — OscarWyck, Jun 25 '14 at 15:27
It seems to be hit and miss right now. Remember you can always just use our old friend NSLog as well. — macshome, Jun 25 '14 at 17:49
@macshome this proposal work for me, after add arbitrarily msg to NSLog, the `println` work success — ruandao, Jan 05 '15 at 02:47

Blackvenom · Answer 1 · 2017-04-20T09:43:41.613

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In recent Versions of Xcode, like Beta 6, the println() result will be displayed in the sidebar on the right.

No need for Assistant Editor anymore.

But you need to install new Beta Versions manually.

edited Apr 20 '17 at 09:43

answered Aug 19 '14 at 09:59

Blackvenom

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score 1 · Answer 2 · answered Jul 04 '14 at 08:44

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1) Close the Assistant Editor

2) Quit Xcode

3) Reopen the playground file

4) Open Assistant Editor (Command+Option+Enter or View/Assistant Editor/Show Assistant Editor)

Now it should show the logs.

answered Jul 04 '14 at 08:44

Upendar Gareri

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okay... just reassuring to whether you closed the assistant editor before quitting xcod, because the log will not reflect if you quit the xcode without closing the assistant editor. I hope you did that 2-3 times. Worked in my case !!! – Upendar Gareri Jul 08 '14 at 07:35

Jorge Casariego · Answer 3 · 2015-09-25T16:39:08.490

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If you're using Swift 2, you can only use print() to write something to the output.

Apple has combined both println() and print() functions into one.

Here is an example to print on a single line (use the optional appendNewLine: argument):

print("Hello new Print with new line", appendNewline: false)

Otherwise print defaults to adding a carriage return at the end of each line.

print("Hello new Print with new line")

edited Sep 25 '15 at 16:39

answered Jun 16 '15 at 18:29

Jorge Casariego

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why would one use that .. when you can only add 2 more alphabets. Laziness wins over this monstrous func call. – Rana Tallal Aug 20 '15 at 13:35
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Please note that in swift 2, the appendNewLine parameter is true by default, so you only need to pass it if you want it to be false. – PedroSilva Sep 25 '15 at 16:34
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Thanks @PedroSilva Now I've edited my answer! You were right! – Jorge Casariego Sep 25 '15 at 16:39

score 1 · Answer 4 · answered May 29 '16 at 09:09

For others who face the issue, they might have closed the area where messages are shown.

If you are using print() ( from Swift 2.0 ) to print and see debug messages, do this.

Click on View on top, Go To Debug Area and click Activate Console.

This will open the area where debug messages are printed.

score 0 · Answer 5 · answered Jun 25 '14 at 15:15

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Which version are you using? Xcode 6 beta 2? OS X 10.10?

If so, it should work.

enter image description here

answered Jun 25 '14 at 15:15

Cai

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I have exactly what you have written. Do not run Yosemite though, but should not make any difference. Or should it? – OscarWyck Jun 25 '14 at 15:26
Xcode 6 crashes all the time on my 10.9.3, so I end up install 10.10 on one of my Macs as a develop machine for Swift. It's hard to say there's a difference or not, only Apple and God knows. And I noticed that, even with the same 10.9 SDK, the one compiled on 10.10 won't run on 10.9, but when you do it on 10.9, it works. – Cai Jun 25 '14 at 15:30

Swift println command does not output in console

5 Answers5