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ViewController respondsToSelector: message sent to deallocated instance (CRASH)
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Use Instruments to track down deallocated instance errors. Profile your application (Cmd ⌘+I) and choose Zombies template. After your application is running, try to crash it. You should get something like that:
Click on the arrow next to address in the popover to show ob...
What is the proper way to test if a parameter is empty in a batch file?
...s in the argument, otherwise you will get a …was unexpected at this time error.
– Synetech
Feb 4 '13 at 19:41
14
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Uninstall / remove a Homebrew package including all its dependencies
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Second line gives an error: This command requires a keg argument.
– Shmidt
Sep 20 '14 at 8:37
7
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Is it safe to check floating point values for equality to 0?
...s because when calculations come into the ground, floating point precision error appears - a concept which does not exist in Real number arithmetics in Mathematics.
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Using try vs if in python
...import timeit
>>> timeit.timeit(setup="a=1;b=1", stmt="a/b") # no error checking
0.06379691968322732
>>> timeit.timeit(setup="a=1;b=1", stmt="try:\n a/b\nexcept ZeroDivisionError:\n pass")
0.0829463709378615
>>> timeit.timeit(setup="a=1;b=0", stmt="try:\n a/b\nexcept ZeroD...
How to play audio?
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If you are getting the following error:
Uncaught (in promise) DOMException: play() failed because the user
didn't interact with the document first.
That means the user needs to interact with the website first (as the error message says). In this case...
How to get the caller's method name in the called method?
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Hello, I am getting below error when i run this: File "/usr/lib/python2.7/inspect.py", line 528, in findsource if not sourcefile and file[0] + file[-1] != '<>': IndexError: string index out of range ...
How to “return an object” in C++?
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How does this work in C++98? I get errors on CINT interpreter and was wondering it's due to C++98 or CINT itself...!
– xcorat
May 31 '17 at 17:35
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Understanding slice notation
...[:-2] and a only contains one element, you get an empty list instead of an error. Sometimes you would prefer the error, so you have to be aware that this may happen.
Relation to slice() object
The slicing operator [] is actually being used in the above code with a slice() object using the : notati...
Android check internet connection [duplicate]
...!address.equals("");
} catch (UnknownHostException e) {
// Log error
}
return false;
}
Permission needed:
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
https://stackoverflow.com/a/17583324/950427
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