Switching iOS devices and the Keychain

Unfortunately some of my MovieLoggr users ran into the following issue: After switching to a new phone and restoring it from a Backup MovieLoggr would behave unexpectetly (and in some cases crash) because the App could no longer access the user’s password and unfortunately did not handle this gracefully.


Using SSH for private and work account on a Mac

Disclaimer: I’m not a huge fan of configuring software; I’m primarily writing this to remember it for the future.

Using SSH instead of HTTPS to authenticate against services such as GitHub, Bitbucket or Heroku is very convenient, instead of typing a password for every interaction Mac OS simply exchanges SSH keys behind the scene. However, one can run into trouble when trying to use multiple accounts of the same service with SSH authentication.


The downside of Web APIs

Web APIs have done a lot for the world of technology. Services that have formerly been isolated islands can now be connected through a few simple HTTP Requests. Posting to Facebook on every GitHub commit? Printing a Postcard as soon as a new Photo is uploaded to a Dropbox folder? Basically anything is possible through Web Services.


Arithmetic Expressions in Swift

While I still cannot fully understand how the release of a new programming language didn’t leak before WWDC, most of us got surprised by the announcement of Apple’s new Programming Language Swift.

Like most iOS Developers I immediately took a look at the new language. Most language details seem fairly straightforward - however, arithmetic expressions were the first small pitfall for me.


Objective-C: Accessing backing iVars of properties in subclasses

Most Objective-C developers have a fairly good understanding of properties and instance variables and how these two work together.

Today I want to discuss an interesting case that will force you to understand the details of the relationship between instance variables and properties. In case you already know these details, this remains an interesting example of how complicated Objective-C can be every once in a while.


When You Can't Avoid Email

Don’t get me wrong, Email is a great tool and an evergreen in everyone’s communication stack. I use it, among many other things, to stay in touch with friends, receive food delivery confirmations and to consume newsletters. Emails are an essential part my everyday life.