Miguel Angel Quiñones

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Knowing when to delete code

Much of the literature and writing related to sofware development focuses on the creation, new ideas, fresh ideas and things to improve in your next project. But when is it a good moment to delete the old stuff in an long term project? Here’s my short rant about this; I recently deleted a chunk of code in my current project and just felt I wanted to write my thoughts.

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Dear SDK developer

As an application developer I get to use many third party code to integrate it into my current project. I want to share a checklist of things a user of an SDK really appreciates.

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Xcode 7.3 analyzer improvements

The latest xcode beta is available for downloading. There are many improvements, and the usual problems with stuff that stops working… Ah the love of Apple for it’s developers :). But I want to tell you about a feature that caught my attention: New analyzer settings!

New analyzer settings

From the release notes:

The static analyzer warns when nil is returned from a method or function with a nonnull return type or is passed to a parameter marked nonnull.

The static analyzer checks for common misuses of Objective-C generics.

The static analyzer checks for missing localizability. This check is off by default and can be enabled by selecting ‘Yes’ for ‘Missing localizability’ in the ‘Static Analyzer - Generic Issues’ build settings.



Objective-C continues to get some love! Adding into the changes for nullability and generics, now the analyzer will start to warn you about usage not in line with your annotations. That’s very good news, considering that the compiler checks were a bit lacking. Additional kudos because both settings are enabled by default.


This is an intriguing one. Let’s investigate further; Let’s say you have some code where you set a string to a label:

label.text = @"not-localized";

You’ll now get a nice analyzer warning: “User-facing text should use localized string macro”


But you won’t get a warning when the key is not localized. Like:

label.text = NSLocalizedString(@"not-localized", nil);

Hey, we can’t have everything, but here’s my request for improvement submitted.

Anyway, go ahead and enable these new settings! And use the analyzer!

Transitioning iOS versions

Having worked in companies developing their own products, I’ve faced many times the problem developers encounter when building iOS applications: Your biggest 3rd party dependency - the OS SDK - is changing under you every year. How does your team deal with this in a maintainable way?

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Building Swift on OSX

Swift is finally open source! This is great because of many reasons, namely the transparency and chances to learn from the people responsible of building the foundational language you work on. I’ve been checking how easy was to build the runtime, REPL and compiler, and it turns out the team made an excellent job to make the process very easy. Let’s see how to do it.

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Three months with XVim

‘Know your key shortcuts’ is the mantra of the productive programmer. I’ve chosen to try using the same keybindings everywhere, investing time and learning Vim. And using xvim in Xcode. In this article I’m going to try to explain why I did this, and I’ll share my experience of the process.

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Poor man’s functional programming

It’s a very exciting time to be an iOS or Mac developer. The platform moves very fast and we got a new toy (language) to play with: Swift. It’s the perfect time to reevaluate, learn and evolve as a programmer, because you will be forced to adopt this new language (yes, I think Swift is the future, 100%).

I want to relate this to the fact that most iOS engineers, or mobile application developers, are traditionally familiar with Object Oriented Programming paradigm. But Swift offers more than different syntax and OOP.

I’m referring to some features inspired by functional languages. If you’ve ever had an interest, but never the chance or motivation to go forth and look into this paradigm, now it’s the perfect time to do it.

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Freehand Drawing

Yesterday my last post on the series ‘Let’s build Freehand Drawing for iOS’ has been published at Badoo Tech blog. It’s been a very good experience for me, and of course I recommend you visit the tutorials if you are interested.

I divided the tutorials in 3 parts:

  • Part 1: Introduces the feature and a naive implementation
  • Part 2: Adds undo functionality, refactoring along the way
  • Part 3: Improves stroke to make it look smoother

Building tutorials is hard

This series has been my first take on writing technical tutorials. And I must say that it’s a lot harder than I thought. You need to keep track of the content, code correctness, and the pace of the articles so it’s readable and understandable. Coding while writing an article is challenging, but the experience has been very gratifying.

I also get to brag about something I was really happy to build for the Bumble project. So I think I’ll definitely write other tutorials in the future.


As an iOS developer or Apple-centric developer, WWDC is a time of excitement and news. The yearly event at Apple offers many networking opportunities, but most importantly sets the stage for the next year of development in the company’s platform. As this year event is closing in, I wanted to write my thoughts on a related, and often overlooked topic; fragmentation

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Adopting nullability annotations

Apple introduced nullability annotations to Objective-C compiler from XCode 6.3. I was really surprised by this change, and welcomed it with open arms when I saw the release notes. My first thought was: Objective-C is learning from Swift! I want to share my 2 cents on this new annotation and what it means for more modern Objective-C code.

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Tip: ExFat HDD with Raspberry Pi

A few days ago I switched my HDD on my Raspberry Pi to a SSD drive. I use the Pi as a NAS serving files at home and I wanted to use a HDD for music with less storage but more reliability. This drive runs 24/7. I also chose exFat for the filesystem. I write this as a future self-reference, but may be useful for somebody else, so here it goes.

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Travis + octopress = Yay!

I just finished setting up Travis CI integration with this blog. So now I don’t even need to do rake generate_deploy. Just git push to source and deploy after 3 mins. Happiness.

I based my config on Hari Menon’s post.

My small contribution to whoever happens to read this post is: Don’t forget to set up your user.name and user.email in Travis CI. Check my final travis.yml if you are curious.

Happy coding!

iOS Code Injection

Write code, compile, wait, navigate to screen in application. Fix problem, recompile wait. Oh it was not fixed, start again… Does it sound familiar? For compiled languages there seems to be no workaround this bottleneck. Even though this is true, there are situations where we can reduce the waiting time, increasing our productivity and happiness. Enter code injection.

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Technical fanatism

Whenever I meet some developer, I can always get a really interesting conversation. Be it tools, opinions on platforms, favorite blogs, books, or some new technique I didn’t know about.
That’s why it’s important to discuss with other people in the field their opinions, they challenge your assumptions and you can gain useful insights which otherwise would be hidden to you for longer. But sometimes, you hit a wall. Somebody does not listen.

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Apple watch: love it and hate it

Let me confess: I always loved smart watches. I am a geek and I like gadgets, I love to see new features ‘just because they are cool’. I own a Pebble watch and I love it, and I most probably will buy Apple Watch. But I think Apple did not solve the main issue with today’s mobile technology, and Smart watches in particular.

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Hello WWWorld

Hi there!

Welcome to my technical blog! I may write here from time to time. My intention is to write about technical stuff, mainly programming and iOS.