How to detect when an iOS app crashes

Great post on StackOverflow about detecting when an app is killed, due to an exception, a signal, etc. Most crashes can be caught using a 3-fold approach: appWillTerminate exception handler signal handler This translates into using: // installs HandleExceptions as the Uncaught Exception Handler NSSetUncaughtExceptionHandler(&HandleExceptions); // create the signal action structurestruct sigaction newSignalAction; // initialize […]

Online resources to learn Apple’s Swift Language

A collection of resources to start with the new Swift language.

Apple introduces iOS 8 SDK and Xcode 6

Another post for InfoQ: “At its 2014 Worldwide Developer Conference, Apple announced its new mobile operating system, iOS 8, alongside new SDKs and development tools. New Apple software includes over 4000 new APIs, including all new frameworks such as HealthKit, HomeKit, and CloudKit, and enhancements to the platform gaming capabilities.” Read it all.

My latest contribution to InfoQ

In the last couple of months, I have been contributing to InfoQ as a News Editor for the Mobile topic. Although this might not look like the most elegant behaviour, I will link here some of my writing for them. here you have my last one: Android 4.1.1 Vulnerable to Reverse Heartbleed Google announced last […]

How Instruments can be used to fix a graphics performance issue

Lately, I have been investigating an issue a customer of mine’s app showed. My customer’s app is a sort of PDF viewer that also allow to add annotations. Such annotations are not stored in the PDF itself, instead they are managed in a custom way and drawn on top of the PDF in a dedicated […]

What’s new in iOS 7 User Interface – Part 2: Deference

In a previous post, I began describing what changes the introduction of iOS 7 brought to iOS UI/UX dimension. In that post, I listed 4 main principles shaping the idea of iOS flat-UI: Clarity Deference Depth Detail Here I will try and clarify what a “deferent” UI should be. Again in the New Oxford American […]

What’s new in iOS 7 User Interface – 1

The new iOS 7 has radically changed the way user interface is conceived on iOS. Indeed, the change has been so radical that along the past few months many not so positive comments and criticism could be found on the web. Now that iOS 7 has officially shipped this is starting to change and many […]

Hitchhiker’s guide to MKStoreKit

In-App Purchase is one of those great feature of the iOS ecosystem that I wish were easier to understand and implement in my apps. In the end it is just a machinery that will not really add value to my apps, and it would be great if the Apple motto “it just works” could be […]

Core Graphics Image Interpolation Performance

Recently, I have done quite a bit of Core Graphics programming and discovered that one key point in ensuring that an app performs well is choosing the right CGContext interpolation level. Interpolation, according to the Wikipedia, “is a method of constructing new data points within the range of a discrete set of known data points.” […]

iOS6: dynamic autorotation

One of the most intrusive changes brought by iOS6 is the way autorotation is handled in UIViewControllers. If you have an autorotating app for iOS5, you will need to change it to correctly support autorotation under iOS6. If you develop an app which is supposed to run both on iOS5 and iOS6, then you will […]

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