Strategy Design Pattern

I was over in Sweden last week teaching a Java design patterns course. Having spent so much time with iOS recently, it was interesting to put my Java hat back on and talk about designing enterprise scale applications. Some of my students probably thought I was a little slow writing code during demos but I […]
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Testing for Memory Warnings

Have you ever opened up an app on your iPhone or iPad and noticed that it crashed immediately? Then it was OK when you restarted it? That’s usually because there is a bug in the way the application responds to the memory management processes in iOS. Memory Management in iOS One of the objectives of […]
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URL Schemes on iOS

The URL scheme is a useful little feature in iOS that allows unrelated applications to communicate with each other in a controlled way. One application can use a custom URL scheme registered by another to pass control to it, supplying arguments as required. Standard URL Schemes Some of the standard iOS apps have URL schemes […]
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Refactoring with Xcode

I’ve spent quite a bit of time this week tidying up the course exercises and solutions for Learning Tree’s Building iPhone® and iPad® Applications: Extended Features course. There were a few bug fixes based on instructor feedback but it was mostly a process of upgrading to modern Objective-C and refactoring the existing code to make […]
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Modern Objective-C

Xcode 4.4 was released on the 25th July and as an update doesn’t make many changes to the basic operation of what was already an excellent IDE. Code completion is more informative, with a new information strip at the bottom of the code completion window, but most tasks are unchanged from the 4.3 release. Of […]
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