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Got this runtime warning, how to get line where it happens?

runtime: UI API called from background thread: -[UIView bounds] must be used from main thread only

Is it any breakpoints i.e. symbolic breakpointfor this?

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2 Answers 2

Reset to default
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Main Thread checker has an option for pausing at the issue. You just need to enable it.

EditScheme->Run->Diagnostics->RunTime API Checking-> Select both Main Thread Checker and Pause On Issues

enter image description here

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3 Comments

What to do if I don't have "Runtime API Checking" in diagnostic options?
@mag_zbc upgrade > Xcode 9. If you have an earlier version the option is not available but neither is the error message.
@luk2302 you have update your UI using DispatchQueue.main.async
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The answer by Puneet Sharma is good, but it has a downside: it requires Xcode 9. However, what you want is possible in earlier version as well, using symbolic breakpoints

Symbolic breakpoint

It works, but I noticed it makes the app run dramatically slow, so whenever possible, use Puneet Sharma's method

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