Xcode 6 Beta / Swift - Playground not updating

Question

I was playing around with the Playground feature of Xcode 6's first beta - and I notice half the time the Playground doesn't update (simply doesn't display the result calculation or how many loop iterations are happening) simple code/loops/functions that are in there. Even the Swift Tour https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/GuidedTour.html

has several lines of code that don't show up in Playground. If you mess with the code sometimes it will show up, by moving the code around or placing it elsewhere. Anyone else? Any fixes? Is this just a beta problem?

score 36 · Accepted Answer · answered Jun 08 '14 at 20:24

36

Make sure you haven't inadvertently added an error to your Playground code. Unfortunately, there is no inline notification of an error, and after an error is created, nothing in the Playground will update.

To help with this, open up the Assistant Editor (File > View > Assistant Editor > Show Assistant Editor), which should include a Console Output box. If there are any errors in your Playground, they will show up there. Once corrected, your Playground should hopefully update once more.

That said, it can be a bit slow depending on the complexity of your Playground and its size.

answered Jun 08 '14 at 20:24

rcw3

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rcw3 thank you, that was it! At the bottom of Assistant Editor it gives you an error you don't see unless you have it open. Thank you for the help. – harveytech Jun 09 '14 at 03:04
I had two projects open and found that closing the non-playground project convinced Xcode to start updating the playground again... – Adam Sep 02 '14 at 23:31

score 3 · Answer 2 · edited May 23 '17 at 10:29

3

This answer (Undeclared Type 'NSView' in Playground) did it for me (restarting Xcode and the machine didn't help):

rm -rf "$(getconf DARWIN_USER_CACHE_DIR)/org.llvm.clang/ModuleCache"

edited May 23 '17 at 10:29

Community

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answered Dec 02 '14 at 11:34

Michael Markowski

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3

score 1 · Answer 3 · answered Aug 24 '14 at 17:26

Had the same strange errors after upgrading to xcode 6 beta 6. For me the problem got fixed with a Product -> Clean. And if that does not fix the errors hold down option key and click again on Product in the Menubar then you will see in the dropdown menu Clean Build Folder... click on that. Or you could download Watchdog app from appstore. This little helper automatically cleans your xcode projects.

Muhammad · Answer 4 · 2015-07-12T06:14:37.440

You have to be very careful with swift. the language is very case sensitive so while using playground make sure all things are spaced out. The following code will NOT give you a syntax error but it will stop processing the rest of your code in playground :

for index in 1...5 {
    if index %2 !=0{
    continue
    }
println(index)
}

The error in the code above is in line 2. The code has to be written

    for index in 1...5 {
       if index % 2 != 0 {
       continue
       }
    println(index)
    }

Hope that answers your question :)

Xcode 6 Beta / Swift - Playground not updating

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