Category Archives: iPhone

Maybe it’s just me, but there’s a quirk in the iPhone’s navigation controller infrastructure that just drives me batty: If you set the leftBarButtonItem of a view controller’s navigationItem while the navigation bar is displaying a “back” button, the back … Continue reading →

I saw a disturbing thing today. I was running a new app in the debugger, and I suddenly began to see messages like this in the console: crasher(8502,0xa07a6500) malloc: *** error for object 0x2017000: pointer being freed was not allocated … Continue reading →

Today I present a simple design technique that can make your UITableViewControllers a lot more flexible. To put it concisely: You should use indirection when considering section indices in your flow-of-control. This technique makes section re-ordering much easier, and may … Continue reading →

About 5 months ago I wrote about my unsuccessful attempt to add more memory to my Mac Mini. Today I gave it another shot, and seem to have been successful. Below, I share a few pieces of information that you … Continue reading →

The iPhone documentation discusses a technique for laying out certain types of tables in NIB files; you add the table’s cells to the NIB file, connect them to outlets that you add to the table view controller, and then write … Continue reading →

In the app I’m currently building, there are many longish text fields that can be edited. I decided to create a little utility class to handle the presentation of an editing interface for these fields, and I’d like to share … Continue reading →

Sudoku Grab is a neat little iPhone app that enables you to solve a Sudoku puzzle by taking a picture of it. The author was kind enough to post an overview of the computer vision mechanics behind the app; if … Continue reading →

Today I want to talk about how two individually reasonable design decisions in Core Data can combine to bite the unwary programmer. I’ve mentioned the benefits of the NSFetchedResultsController class’s ability to monitor the objects in its MOC for changes, … Continue reading →