Why you should use CocoaPods?

This blog post has the intention to show to beginners the tool called CocoaPods, if you’re already familiar with it you may find it boring because I’ll probably show you something you already now.

What’s CocoaPods?

“CocoaPods is a dependency manager for Swift and Objective-C Cocoa projects. It has over 37 thousand libraries and is used over 2.6 million apps. CocoaPods can help you scale your projects elegantly.”(CocoaPods)

If you’re familiar with Rails, you may remember the Gemfile system, and yes, it works just like that. In fact CocoaPods is a gem for Ruby. You can contribute for the project by sending a pull request on the official repository.


The advantages of using CocoaPods

You are ready to develop your first iOS project, you’re full of ideias, at first having a dependency manager seems to be pretty not necessary, but remember, you app won’t be the same after every update, in fact, if you’re planning to build the next successful app, you may need starting worrying about how to organize it, this where CocoaPods comes in.

Managing a project dependencies by hand it is not the best ideia, actually, it is a terrible idea, imagine having a project with 50 dependencies and having to update all of them ? Scary huh ? That’s the reason you need a project manager, with CocoaPods if you want to update a pod(That’s how a dependency is called in CocoaPods, like a gem in Ruby) you just need to type:

pod update the_name_of_the_pod

and it will do all the work for you, after that you just need to recompile your project on XCode, and that’s all.

Another reason to use CocoaPods is: a lot of big companies are using it, like Facebook , Google and many others.

You have a lot of support, there are thousands of apps using it, and Stackoverflow if full of questions about it.


Thanks for reading this post, it is always a pleasure writing for you guys. If you like what you just read and somehow you want to support me, you can become a Patreon . Being my Patreon makes you get my private posts about programming with iOS and Ruby.

If you’d like to know more about my or what I do, you can follow me on Instagram or Twitter .

See you next time!


Why did I choose Ruby as my first programming language ?


Back in the time when I was starting learning how to program, I remember a bunch of guys talking about Java and many other cool stuff and I was really excited about it, but there was also a guy, a shy one, which said me he was learning a different programming language, the one you won’t get scared at first glance, the one with an easy syntax and also a a cool framework called Rails. The programming language he was talking about was Ruby.

At first I thought “Man, this guy is insane, Java is the future, this programming language is not even popular”, but I was wrong, I live in Brazil and that time (January 2010) Ruby wasn’t a known programming language here, but after some research I realized it was popular in other countries like the USA, then I’ve decided to take a look at it.

The First Book

I remember the first book I got for learning Ruby, it was Programming Ruby by The Pragmatic Programmer’s Guide  , at first I was amazed by the way the book was organized, they used a non convencional way of teaching a new programming language, which sounded pretty amazing.

After I finished that book I decided to read “The Agile Development with Rails ” also from The Pragmatic Programmer’s Guide, and once again, another cool way of teaching a framework, it was like, reading some basic stuff and then jump into a real application.

The First Job

After studying lots of things about Ruby/Rails I realized I needed a job, but then I thought: How to get a job in a country where Ruby is not even known ? Lucky, I met a guy that was working for a company which I don’t remember the name right now, but he was using Rails and that fitted perfectly for me, so I asked him for an opportunity to work with him, and surprisingly he said yes.

We started working from his garage (I know this sounds like a cliche, but it was like that), the first projected I did was a simple web site with a couple of pages like: Contact, Bio, Fotos. I was really excited when I finished it, you know, the feeling you have when you get something done.

After a couple of months working with him, I realized I learnt how to program faster as I’d be if I’d studied Java. I’m not saying here Java is a bad language, but in that time I was a beginner and making a lot of things with less code and a more descriptive programming language sounded like a dream to me.



I’m still using Ruby on Rails on some projects, but not as much as before, but why ? Because now I’m working as a mobile developer and there are many things a I need to deal when making apps, one of them is: Scalability. Ruby is not scalable which is pretty bad for today’s applications. You may wondering, but there are a lot of solutions for that with Rails, I know, the fact is: I need something made for it, this is how I met Elixir , but this is a subject for another Post (which I promise I will do it soon).



If you’re new to the programming world, you should learn Ruby. Why ? Because it is still popular, and you can understand how the programming world works faster. There are still a lot of jobs for Ruby developers, of course, with a lot of skills needed, but still worth it.


Thanks for reading this post, it is always a pleasure writing for you guys. If you like what you just read and somehow you want to support me, you can become a Patreon . Being my Patreon makes you get my private posts about programming with iOS and Ruby.

If you’d like to know more about my or what I do, you can follow me on Instagram or Twitter .

See you next time!

How to check simulator or device in iOS

Sometimes you need to check if the app is running on a device or a simulator. Why? If you’re using GoogleMobileAds lib you may need to verify is you’re on simulator to show the testing ads provided by Google.

Bildschirmfoto 2017-09-22 um 15.48.38

Happily there’s a way to do it. I personally prefer creating a struct, since I don’t need a class for it.

So let’s get started:

struct Platform {

    static let isSimulator: Bool = {

        var isSim = false

        #if arch(i386) || arch(x86_64)

          isSim = true


        return isSim




What does the code do ? It basically checks if the architecture is i386 or x86_64 which means a computer.(Simulator)

The arch(i386) build configuration returns true when code is compiled for the 32–bit iOS simulator.

Then you can use it on your code:


    //your code goes here


That’s all, I hope you enjoy it. If you want to see more blog posts or some cool stuff about iOS and macOS dev, follow me on twitter @gabriellidenor

If you like photos or pets, you can follow me on Instagram @gabriellidenor

See ya!

iOS – How to round the corners of a button

In this post I’m going to cover how to round the corners of a button in iOS.

I’ve seen a lot of solutions for this, but I found a really simple one.

First of all, you need to select the button and then go to the Object Inspector and click on the + button, then you need to create the keypath: layer.cornerRadius type as a number, then add the value 4 or the value you want as shown below.

Captura de Tela 2016-02-03 às 12.11.12

After that you can run your app and see the result.

PS: you can only see the result when running the app

That’s all for today. See you in the nexts posts

Swift 3.0: How to call a method on main thread?

Hi guys, long time no posting on my blog, from now on I’m going to post a lot of useful stuff about Swift 3.0+.

Most of the time when we are building an app we need to make a method call on main thread even if we are not actually on main thread.

The most common case is when we are using tableview and need to refresh its content like this:


If you run the code above it won’t work properly or it will show an error, because you need to run it in the main thread. To make this code actually work, you need to call it like this:


        DispatchQueue.main.async(execute: {() -> Void in



DispatchQueue manages the execution of work items. Each work item submitted to a queue is processed on a pool of threads managed by the system.

Basically the code above is calling the class DispatchQueue with the property main, which means you want to call the method inside the main thread, this method won’t return anything.

That’s it, see you in the next post.

How to send Push Notifications from a Mac OS X – Push Robot

Mobile Developers love to imagine the users of their apps using the app all day. Push notifications allows developers to reach their users and perform small tasks even when users aren’t actively using an app.

Google has created Firebase Cloud Messaging for helping developers sending Push Notifications to their apps. You just need to login to your Google account and after some setup, you can easily send push notifications. What if you could send notifications from your Mac ? With this in mind, I’ve decided to create a Mac OS X App called Push Robot.

Push Robot allows you to send Push Notifications to your apps using FCM, all you need is the Server Key and the Topic or Device’s Token(to send push notifications to a single app).

Screen Shot 2017-04-12 at 07.54.21

To get the Server Key:

  1. click the settings icon/cog wheel next to your project name at the top of the new Firebase Console
  2. Click Project settings
  3. Click on the Cloud Messaging tab
  4. The key is right under Server Key

Now you can send a push notification to a topic which can reach millions of users or for specific users using the device’s token.

That’s all for today, I hope you guys enjoy the app.

See ya!

How to build an API using Rails – Part 1

The Rails 5 is out, and of course it came with a lot of new features and improvements, on this tutorial I’m going to cover the Rails API feature.

With all the Javascript stuff coming out, we have a lot of tools for building APIs these days, we have Express, Sails Js and many others. How about Ruby Developers? The most cool feature of Rails 5 is Rails API.

Rails::API is a subset of a normal Rails application, created for applications that don’t require all functionality that a complete Rails application provides. It is a bit more lightweight, and consequently a bit faster than a normal Rails application. The main example for its usage is in API applications only, where you usually don’t need the entire Rails middleware stack nor template generation.

Before you starting doing something you should download the most recent version of Ruby and Rails. I’d recommend using RVM for managing many versions of Ruby.

With all set the first command you should run is:

rails new rails_api_tutorial –api

This command will generate only the basic structure for building an API. It will make the ApplicationController inherit from ActionController::API instead of ActionController::Base. It will also configure the generators to skip generating views, helpers and assets when you generate a new resource.

The next step is to setup the testing stuff like: Rspec, FactoryGirl, Shoulda-Matchers and Rails Controller Testing.

After you adding all those gems your Gemfile should looks like this:


Hit bundle install to install those gems, and check the documentation of each one for more information about putting them to work.

After that you should create a folder called models inside of the spec/ folder, which will contain all the model specs of the API.

With all set, now we will create the first model spec of the application. Inside the spec/models folder create a Ruby file called post_spec.rb

The things the should be tested on model are: Table Fields, Validations, Relationships and any method you’d create. 

We are going to create a simple table for handling our posts, but first we need to create the spec for it:



If we run this spec it will shows an error, because we haven’t implemented the Post model yet. Let’s do it:


We also need to create a migration with all the fields. For creating a migration run:

rails g migration post

After that, open the migration and add the fields:


Now you can migrate:

rails db:migrate

And prepare the migration for the tests:

rails db:test:prepare

After all you can run the command:


And all the tests should  pass:


The first part of this tutorial we covered:

  • The creation of an API only Rails Application
  • The setup of all the testing stuff
  • The creating of the Post model

On the next part of this tutorial I’m going to cover about controllers, how to test them and so on.

The source code of this tutorial is available on my Github: https://goo.gl/7Gr8WC

Do you like this post ? Would you mind to follow it ?

See you guys on the next part.