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M7 Pedometer

Mar 28, 2014

Apple’s iPhone 5S features a dedicated motion coprocessor, dubbed the “M7”. Probably because the M stands for Movement/Motion similar to the A in “A7” standing for … um, Apple. This coprocessor collects and analyzes data from multiple iPhone sensors and determines two interesting pieces of information:

  • the motion activity state of its user (car, walking, running, standing still) ad hoc and history
  • the number of steps taken ad hoc and history

Let’s build a functional pedometer app so that we can learn about and explore the latter.

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Radar: AV Foundation wastes energy processing Audio even if not captured

Mar 21, 2014

For my book I wanted to see if there is a way to see the performance impact of various settings. So I launched the Energy Diagnostics instrument for the first time. I was not able to conclusively demonstrate the impact of any capture setting, but I did see something odd. Even though my barcode scanner sample app does not have any need for audio data AV Foundation appears to insist on capturing and processing it.

As the energy diagnostics performance instrument indicates, this causes energy usage for “Audio Processing” even though for the purpose of scanning barcodes audio is not needed. In the least developers should be able to indicate to iOS that they have no use for audio processing so that the system can conserve this energy.

This bug report is filed as rdar://16389364 and on Open Radar.

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Radar: Make Aztec and PDF417 Core Image generators public

Mar 18, 2014

There are 3 generators in Core Image for 2D barcodes, but only the one for creating QR codes is documented. So I filed a bug report suggesting that the documentation was “missing”. I also sent an email to the responsible Apple evangelist.

The response I got from Apple was that if something was not documented it is to be considered private. The bug report about adding the documentation for Aztec and PDF417 was closed.

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DTCoreText 1.6.11

Mar 18, 2014

In the 3 months since the previous release quite a few things happened on the development branch of DTCoreText. Additionally there were some issues related to iOS 7.1 and Xcode 5.1 that needed urgent addressing. Even though there are a few new features I decided to go with a bug fix version number. This way if somebody is using DTCoreText via CocoaPods and has the the version restricted to 1.6.x he gets all the critical fixes.

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DTDownload 1.1

Mar 17, 2014

This minor update to DTDownload adds a new feature: DTDownloadQueue now has a download priority.

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DTChartView 2.1

Mar 16, 2014

DTChartView is the very first component that I ever sold. Just like with the recent update to DTCalendarView there are still some stubborn users, so I finally brought it into the present.

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DTCalendarView 2.1

Mar 16, 2014

DTCalendarView is one of the very first components I started selling on the Cocoanetics Parts Store and the last update to it was 3 years ago. Because it still has a few stubborn users who love it (despite the dated iOS look), I updated it for iOS 7, 64 bit and fixed the warnings of Xcode 5.1.

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DTFoundation 1.6.2

Mar 12, 2014

This maintenance release addresses a few minor build issues with the new Xcode 5.1.

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Printing to Thermo-Labels

Mar 11, 2014

A few days ago I largely finished chapter 5 of my book where I explain how to print a sheet of QR stickers as well as individual serial number barcodes to roll-feed printers. The latter is a new capability of iOS 7 and extremely useful if all you want to print is a single label. This is why I picked the use case of a serial number barcode for my book. The assumption for the sample app is that you want to print a single serial number as Code 93 which you would stick to the back of some corporate IT hardware item.

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Read my Book!

Mar 06, 2014

For the past four months I have been working almost exclusively on my Book Barcodes and iOS 7, which is why there have been only very few tutorial blog posts on Cocoanetics.com. Now the first fruits of my labor of love are yours for the picking.

My publisher Manning has started the MEAP pre-order program for the book. This MEAP program gives you – of course – the final book when it is finished, but you can also read the chapters in their raw unedited state as I finish them.

Even better, you can read the first chapter for FREE, no purchase necessary. This chapter gives you a solid overview over the barcode types that iOS 7 can scan, explains their differences and shows where they are used.

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