New “When In Use” Location Tracking in iOS 8

Posted by on Sep 12, 2014 in code, iOS | No Comments

If your app tracks the user’s location, you may notice when you run it in iOS8, the location tracking alert asks for permission to “access your location even when you are not using the app“. If your app only accesses the user’s location when the app is running, you can present a less scary message […]

Not Cuckoo for CocoaPods

Posted by on Dec 10, 2013 in iOS | 7 Comments

The projects we work on generally have have dependencies on one or more (often several) open source projects, including our own libraries. We’ve always managed those dependencies using git submodules. As submodules have some quirks, a few projects have cropped up trying to make dependency management easier. The one that’s gained the most traction is […]

Frame geometry macros to improve your UIKit code

I find myself doing more and more dynamic UI layout in iOS apps these days. When elements of a UI need to resize to fit their contents, or move to accommodate other elements, the layout code can get complex and verbose. We’ve developed a set of Objective-C UIKit macros that help make this code more […]

Objective-C Singleton Pattern Updated For Testability

Objective-C Singleton Pattern Updated For Testability

Posted by on Jan 24, 2013 in BDD, iOS, iPad, iPhone, Mac OS X, Software Development, TDD | 10 Comments

At Two Bit Labs we do a fair amount of unit testing. In places where we use singletons we use a variation on the the Objective-C dispatch_once pattern of thread safe singleton creation. This variation supports resetting the singleton or replacing it with a mock object. That way in our unit tests we can do […]

Objective-C Blocks Cheat Sheet

Posted by on Dec 6, 2012 in iOS, iPad, iPhone, Mac OS X | 6 Comments

Blocks are an incredibly powerful addition to Objective-C, introduced in iOS 4. However, their syntax can be maddeningly difficult to remember. Matt Gallagher has an excellent post that breaks down the syntax to help you understand it. If you haven’t read this article, go do it now. Even after working with blocks for a while, […]

GSM 0338 encoding for SMS

Posted by on Aug 27, 2012 in iOS, Mac OS X, Mobile Applications | One Comment

Here’s a little Objective-C helper class we wrote to make it easier to convert NSString’s to GSM 03.38 encoding on the iPhone, iPad, or Mac: Handles stripping out characters not included in the GSM0338 character set Calculates the length of a GSM 0338 string (e.g. ^,[,|,etc each require 14 bits instead of 7 Gives you […]

Kickstart your apps with the iOS Xcode Starter Project

Kickstart your apps with the iOS Xcode Starter Project

We created the iOS Xcode Starter Project to make it quick and easy to start a new iPhone or iPad app. Our goal was to create a template to save the hours of effort it takes on a new project configuring essential open source libraries, the unit and functional testing environments, analytics, multiple targets, multiple […]

Block initialization for testability and reuse

Block initialization for testability and reuse

Since Apple introduced block support in iOS 4, more and more APIs are moving from delegation to block callbacks. While block callbacks can be declared inline, in most cases you should initialize your block callback in a method that returns the block. This keeps the code that calls an external API succinct, allows you to […]

The reviews are in!

So be honest: What’s your answer to the question “Do you enjoy reading the latest app store reviews for your app?” (a) “Our users are so smart, kind, and thoughtful that I relish the chance to read their pearls of wisdom.” (b) “Unless they’re written on the bottom of a pint glass, no.” (c) “I’d […]

TechCrunch covers FarFaria, the new iPad app we helped out on

Posted by on Apr 15, 2012 in iOS, iPad, Mobile Applications | No Comments

TechCrunch covers FarFaria, the new iPad app we helped out on