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Author: Jeffrey Schneider

Blank white screen every time I run the iOS simulator

January 14, 2021 Jeffrey Schneider

Question or problem in the Swift programming language: I’ve created a simple program where a person can log in with a username and password. Every time I attempt to run it, I simply get a blank white screen. I tried changing the background color to a dark green one in hope that it would change […]

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12 useful Terminal commands on Mac

When did `guard let foo = foo` become legal?

January 14, 2021January 17, 2021 Jeffrey Schneider

Question or problem in the Swift programming language: Back in November of 2016 I posted a question asking why I couldn’t use guard to create an unwrapped version of a variable using the same name as the optional, like you can with if let:

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12 useful Terminal commands on Mac

Unable to access index of tabBar item using swift

January 14, 2021 Jeffrey Schneider

Question or problem in the Swift programming language: Environment: xcode 6GM, Language Swift. I was setting image color of a tabBar item using this code in xcode 6 beta2

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Iterate through dictionary values?

January 14, 2021 Jeffrey Schneider

Question or problem about Python programming: Hey everyone I’m trying to write a program in Python that acts as a quiz game. I made a dictionary at the beginning of the program that contains the values the user will be quizzed on. Its set up like so:

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12 useful Terminal commands on Mac

NSNotificationCenter: Add observer but only if not registered to observe? Possible to query observing status for an object?

January 14, 2021 Jeffrey Schneider

Question or problem in the Swift programming language: Is there a way to see if an object is already an observer for a type of notification?

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Iterate a certain number of times without storing the iteration number anywhere

January 14, 2021 Jeffrey Schneider

Question or problem about Python programming: I was wondering if it is possible to perform a certain number of operations without storing the loop iteration number anywhere. For instance, let’s say I want to print two “hello” messages to the console. Right now I know I can do: for i in range(2): print “hello” but […]

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Swift: Auto-Login user with Firebase

January 14, 2021 Jeffrey Schneider

Question or problem in the Swift programming language: I want to auto-login the user if he is already signed and just head to the main view but the code is running twice and you can see the transistion instead of the view just showing. How do I fix it?

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Python is a powerful general-purpose programming language.

Slice Pandas dataframe by index values that are (not) in a list

January 13, 2021 Jeffrey Schneider

Question or problem about Python programming: I have a pandas dataframe, df.

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Unicode identifiers in Python?

January 13, 2021 Jeffrey Schneider

Question or problem about Python programming: I want to build a Python function that calculates,

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numpy float: 10x slower than builtin in arithmetic operations?

January 13, 2021 Jeffrey Schneider

Question or problem about Python programming: I am getting really weird timings for the following code:

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