Hi, I’m Ole. I’m a developer from Berlin and co-author of Advanced Swift. Here, I mainly write about Swift and app development on Apple platforms. More about me.

1. PhotoKit’s data model

   An entity graph of the Core Data data model used by Apple’s Photos framework on iOS. More >

   September 28, 2018

2. It’s wrappers all the way down

   Swift 4.2 comes with a lastIndex(of:) method. I explore how one might implement this method manually and why this is a good exercise to understand the standard library’s collection design. More >

   September 25, 2018

3. The 2018 Macbook Pro

   My impressions after using a maxed-out 2018 MacBook Pro for three weeks. More >

   September 7, 2018

4. Why you’re not supposed to call description

   The documentation for the CustomStringConvertible protocol discourages accessing a value’s description property directly. Instead, you’re supposed to call String(describing:). Why? More >

   August 31, 2018

5. An iOS alert view with a text field and a “smart” OK button

   I wrote a UIAlertController extension that allows you to perform validation of the text the user has entered while the alert is on screen. It’s nothing earth-shattering, but what I like about it is that the behavior is entirely encapsulated in the initializer. Clients only deal with the same UIAlertController object they’re used to. More >

   August 13, 2018