Category Archives: iPhone

In my Fightcard application, I had to implement a lot of “picker” screens – screens that essentially let the user select one of a list of options, much as a drop-down does in a conventional GUI. Since the behavior of … Continue reading →

Today, a quick guide through basic location services on the iPhone 3G (i.e. I’m not handling heading information here.) I run through a quick overview of the steps involved in building a basic location-aware app, and provide a complete Xcode … Continue reading →

I’m pleased to announce that Apple has approved my very first “real” iPhone application: Fightcard. This app implements a boxing scorecard (also suitable, I guess, for MMA on the 10-point-must system) that allows you to systematically and properly score a … Continue reading →

The iPhone makes the database underlying it’s built-in Contacts application available through a framework. This is handy, for two reasons: If you want to let the user contact people from inside your app, it’s a good idea to make it … Continue reading →

We’ve been talking about some Core Graphics trickery recently, related either to fancy gradients used to create shiny buttons, or complicated clipping. I wanted to take a moment to time some of this stuff out on the iPhone, and see … Continue reading →

I want to revisit Tuesday’s discussion of clipping; when I wrote that post I was laboring under certain misconceptions related to Core Graphics paths, which I would like to discuss. As a consequence of correcting these misconceptions, I can see … Continue reading →

We’ve seen that we can use clipping paths to draw gradients inside rounded rectangles, as in the example to the left. Now, suppose that we want to clip a gradient to a “hollow” shape: Will Core Graphics handle this properly? … Continue reading →

A quick list of interesting posts on the subject of autorelease: Overview (Don Yacktman) When does autorelease release? (Parmanoir) Retain/Autorelease in Cocoa Getters (Seth Willits) More Fun With Autorelease (Mike Ash)

The trickiest part of developing for the iPhone is probably signing your code s.t. it will install on a device and/or be accepted by the App Store. While there are harder (and more interesting) problems, this is the only one … Continue reading →