How to fix a "Duplicated Symbols" error on binary files

When including third party libraries into your project, you can run into a “Duplicated Symbols” error on the linking process. This annoying error is due to a name collision between one or more of your classes, usually caused by either:

iOS Performance tips (I): Drawing shadows

It is very common to see shadows in different apps. In many occasions shadows are just rendered by using an image with the shadow predrawn, which basically performs as any other UIImageView. However, sometimes you may need to draw the shadow from code. When this time comes you will face performance problems that in case of heavy use (especially in iPad in combination with table or collection views) it can slow down you UI. 

MVC in Objective-C (III): The view layer

In previous chapters we have exposed how the MVC pattern separate concerns in three layers and we have analyzed how to correctly implement the Model layer into your iOS project. In this post, I am going to continue with the next element in the MVC roles: the View role.

Localization in iOS apps made simple

Localizing iOS apps with the standard tools is tedious, especially when you use Interface Builder files. To resolve that, I have created a new tool called AGi18n that makes it extremely easy. But let’s first start by analyzing the existing approaches for it together with their problems, to later introduce the library and all the goodies that you get from it.

MVC in Objective-C (II): Model

Today, as part of the MVC in Objective-C series that I am writing, I am going to introduce the best practices that I have found so far when dealing with the Model role in your iOS app. But lets first give a quick introduction about the Model role: