multithreading - NSProgressIndicator built-in animation raises CA_ASSERT_MAIN_THREAD_TRANSACTIONS -


this looks bug in either nsprogressindicator or xcode 9 me:

  • run xcode 9 beta 1 or beta 4, in macos 10.12.6.
  • file > new project, macos, cocoa app, objective-c or swift, arc or not, no storyboards, latest (10.13) sdk.
  • in app target's environment, set ca_assert_main_thread_transactions=1.
  • in app delegate, add iboutlet progressindicator.
  • in nib, add nsprogressindicator window, connect outlet. leave checkbox indeterminate switched on.
  • in -applicationdidfinishlaunching, call -startanimation: on progressindicator.
  • build , run.

expected result:

progress indicator should happily show indeterminate progress, because did on main thread.

actual result:

app crashes, citing ca_assert_main_thread_transactions, when -startanimation: called.

you can see in tiny demo project.

did wrong? expected result incorrect?

p.s. asked on apple's developer forums, still awaiting moderator approval after 2 working days, deleted , came here instead :(

update: still lacking explanation, filed apple bug 33593575.

this bug in nsprogressindicator. bug report (thank filing!) marked duplicate of earlier bug, resolved in macos 10.13.


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