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Open Letter to Long Lost Contacts

Jun 21, 2014

I extracted all E-Mail addresses from my archive, dating back almost 6 years. From the resulting 7303 I filtered all that didn’t seem to address individual people. That left 5466.

For a while I considered sending an email to all of these via Mailchimp. I even wrote the letter below, in English because I figured that most people would understand that. But then I decided against sending a mass e-mail, fearing that it would cause me more trouble than positive outcomes.

Instead I’m posting it on my blogs. Much less of a nuisance …

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E-Mail Validation

Jun 18, 2014

For the ProductLayer sign-up form I wanted to make sure that the user can only send a sign up if the email address is valid. If you google for ways to validate an email address you most often solutions involving regular expressions. But since I don’t trust a RegEx unless I know it by heart, I implemented the validation with Apple’s own NSDataDetector for links.

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For Hire

Jun 11, 2014

Over the last 8 months I worked almost exclusively on my book on Barcodes with iOS 7. That meant that during this time I could not take on any new projects. That has changed now, that my book is feature complete. There are some edits remaining to be made, as well as adding info on enhancements coming in iOS 8.

But as I need to earn a living I am now back on the market for taking on project work. I am acting Developer Evangelist for our Product Layer startup and am now looking for contract work to fill the income gap. I’ve summarized my skills and interests for your reference.

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Should I switch to Swift?

Jun 09, 2014

Angelina asks:

I was very surprised when I heard about Swift.  I was curious what your thoughts are about Swift and phasing out Objective-C specifically since you are in the process of writing the Barcodes book.  Are you going to update your book to use Swift instead of Objective-C?

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DTCoreText 1.6.12

Jun 04, 2014

It’s been a while since the previous update to DTCoreText. Now that I mostly finished my book I pulled together a new maintenance release.

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DTFoundation 1.7.0

Jun 02, 2014

This release of DTFoundation contains fixes for the most part, but also one new class DTProgressHUD. Also it is the first released via the new CocoaPods Trunk mechanism. This is why it gets a minor release number bump.

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Book: Feature Complete

May 31, 2014

On the last working day of May, I handed in the 7th and final chapter of my book. This chapter on Geofencing and iBeacons rounds off the offering of all technologies in iOS you need to know to build apps centring around physical products.

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Radar: Ranging of iBeacons might fail if beacon is emitted on same device

May 22, 2014

This problem was encountered by me while research for chapter 7 of my book. Apparently other developers have encountered it as well as you can see from several questions on Stack Overflow:

So I am filing this as a dupe hoping for it to be fixed in iOS 8. Or if not, that it will become more visible to Apple.

Filed as rdar://17003408 and on Open Radar.

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Radar: Monitoring CLRegion immediately after removing one fails

May 21, 2014

This gotcha became apparent to me while putting together the sample app for the seventh and last chapter of my book. There I am monitoring for the 10 regions from a plist which are closest to the user. I was removing all monitored regions and re-added the 10 I am interested in. To update the state I called the requestStateForRegion: but didn’t get a state update. Instead the monitoring failed with error code 5. Fortunately a workaround is possible.

Submitted as rdar://16986842 and to OpenRadar.

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Forward Geocoding

May 16, 2014

There are two kinds of Geocoding which you might encounter: forward and reverse. The class doing that for you in iOS is CLGeocoder. It is both capable of doing it forward (from address to lat/long) and reverse (from geo coordinates to placemarks). For this tutorial we will build an app that lets you search for addresses and display the results individually on a map view.

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