what does Error Thread 1 EXC BAD INSTRUCTION code EXC I386 INVOP subcode 0x0 mean

Question

I got this error      Thread 1 EXC BAD INSTRUCTION  code EXC I386 INVOP  subcode 0x0    How can I solve this  The code works normally  but in the calculator when I click the only equal button  it gives that error    IBAction func equals sender  AnyObject         secondNumber   Screen text  toInt        here it shows an error which is  Thread 1 EXC BAD INSTRUCTION  code EXC I386 INVOP  subcode 0x0        if operation                 result   firstNumber   secondNumber           else if operation     -            result   firstNumber - secondNumber           else if operation     x            result   firstNumber   secondNumber           else           result   firstNumber   secondNumber           Screen text      result

User · Answer

try to clear workspace  rm -rf     Library Application  Support  quot your programm name quot

User · Answer

This line secondNumber   Screen text  toInt     means  Get the Screen object  get the text property and please crash if it doesn t exist  then get the text converted to an integer  and please crash if it doesn t exist  That s what the   means   quot I am sure this thing exists  so please crash if it doesn t quot   And crash is what it did

User · Answer

Generally  EXC BAD INSTRUCTION means that there was an assertion failure in your code  A wild guess  your Screen text is not an integer  Double check its type

User · Answer

I got this on WatchOS Sim  The issue persisted even after   Deleting the app Restarting Xcode Deleting Derived Data     and was finally fixed by  quot Erase all Content and Settings quot  in the simulator

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mine was DispatchQueue main sync inside the closer I made it DispatchQueue main async and it worked

User · Answer

Your secondNumber seems to be an ivar  so you have to use a local var to unwrap the optional  And careful  You don t test secondNumber for 0  which can lead into a division by zero  Technically you need another case to handle an impossible operation  For instance checkin if the number is 0 and do nothing in that case would at least not crash    IBAction func equals sender  AnyObject         guard let number   Screen text  toInt    number  gt  0 else           return            secondNumber   number      if operation                 result   firstNumber   secondNumber           else if operation     -            result   firstNumber - secondNumber           else if operation     x            result   firstNumber   secondNumber           else           result   firstNumber   secondNumber           Screen text      result

User · Answer

Mine was about      dispatch group leave group    was inside if closure in block  I just moved it out of closure

User · Answer

In my case this was caused by an integer overflow  I had a UInt16  and was doubling the value to put into an Int  The faulty code was  let result   Int myUInt16   2    However  this multiplies as a UInt16  then converts to Int  So if myUInt16 contains a value over 32767 then an overflow occurs    All was well once I corrected the code to  let result   Int myUint16    2

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In my case it happened when calling a function by passing a parameter of a Core Data managed object s property  At the time of calling the object was no longer existed  and that caused this error   I have solved the issue by checking if the managed object exists or not before calling the function

User · Answer

I got this error while I tried to write to a variable at the same time from different threads  Creating a private queue and making sure one thread at a time can write to that variabele at the same time  It was a dictionary in my case

User · Answer

If someone else have got a similar error message  you probably built the app with optimisations production  flag on and that s why the error message is not that communicative  Another possibility that you have got the error under development  from i386 I know you were using simulator   If that is the case  change the build environment to development and try to reproduce the situation to get a more specific error message

[ios] what does Error "Thread 1:EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)" mean?

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