New created Xcode 10 playgrounds are offering a play button to execute a playground step by step.
If I open a playground created on an iPad or in a previous versions of Xcode the play button is missing.
I would like to convert all my existing playgrounds to Xcode 10 style playgrounds but did not find any possibility to do so in a simple way.
Those playgrounds must be set to Automatically Run
, it is unrelated to the device on which it was created/Xcode version.
The play button shows up when the playground is set to Manually Run