Using Xcode 10 Instrument’s Time Profiler template to optimize Swift 4.2 code

My original article — “How to Use Xcode Instrument to Optimize Your Swift Code” — was published on

I still run across curmudgeons who flat out reject techniques like object-oriented programming (especially inheritance and polymorphism), protocols and protocol-oriented programming (especially composition), generics, and closures. On a conscious level, the curmudgeons usually reject these technique because of their supposed “massive” performance cost. On a subconscious level, the curmudgeons don’t understand these technologies. So do we give up all hope or do we accept the fact that compiler designers have come up with brilliant optimizations that ameliorate the use of such high-level technologies? We believe in Swift’s compiler designers. Do we realize that there are great tools like Xcode Instruments that help us find awkward implementations of these techniques and give us the opportunity to come up with our own optimizations? Yes.

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Dividing and conquering your Xcode projects with targets

My original article — “Dividing and Conquering Your Xcode Projects with Targets” — was published on

In this tutorial, I’ll show you how to leverage Xcode targets to control the massive complexity involved in building iOS (and macOS, watchOS, and tvOS) apps. A lot of time can be saved when developers realize that not everything they’re required to do has to be done by writing software language code, like Swift. Integrated development environments (IDEs) like Xcode offer very powerful tools, like targets, that allow developers to decouple nitty-gritty tasks that used to be done in code (or manually) out into project configuration settings. I’ve found that, because of the sheer number of project settings, developers often take one look at say, Xcode’s long, long list of Build Settings, and want to curl up and pass out. When finished reading this tutorial, you’ll see that you can neatly organize code into one project that’s capable of producing binaries for iOS, macOS, watchOS, and tvOS.

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