Archive for May, 2009
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Images and Caching
If you are working with a large number of images in an iPhone application, read on, chances are I can save you some trouble when it comes to memory management. Let me provide some background information…
I’ve been working on an application which has images divided into several sub-directories:
Debugging Macros
In a previous post, Yet Another Debug Output Replacement, I wrote a macro that I prefer over NSLog as the output does not prepend the date/time and object information that NSLog does.
Since that time I’ve pulled together a few more macros that I use on a regular basis for printing debug information on rectangles, points [...]
Suspend or Ignore Touch Events
Temporarily stop/suspend touch events on the iPhone.
Save an Image to Camera Roll
Saving an image to the camera roll on the iPhone is as close as a method call in the UIKit. However, it takes a few steps to wrap together code to manage error handling and notification that the image has been saved. Let’s see how this works.
Let’s begin with the method description to save [...]
iPhone Video Tutorials – New Sponsor
John C Murphy , a new sponsor of iPhone Developer Tips.
John is the creator of an excellent series of video tutorials for aspiring iPhone and Mac developers. With topics ranging from Cocoa to Objective-C to Xcode, this is a good resource for those new to programming on the Mac platform. Many of the videos are [...]
Determining Elapsed Time
I recently wrote a short block of code to display an activity indicator while waiting for an image to be written to the iPhone camera roll. The problem I ran into is that the time to write the image file varies, depending on the image size. In some cases the activity indicator would be visible [...]
