Objective-C - How to force low memory on iOS simulator -

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i have error users having of exc_bad_access when device low on memory. stack trace pointing if line below, , believe it's because of utf8string that's being deallocated , still being used:

dispatch_sync(dbqueue, ^{     if (sqlite3_bind_text(sql_stmt, 1, pid.utf8string, -1, sqlite_static) != sqlite_ok) { ...

i'm having hard time reproducing issue on end, how can force or simulate low-memory on simulator or device?

update:

i've tried adding breakpoint line above, , using option simulator -> simulate memory warning, still can't reproduce exc_bad_access error.

in simulator there menu item: hardware : simulate memory warning

or

shiftcommandm


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