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. The 2018 Macbook Pro

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

   September 7, 2018

2. 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

3. 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

4. Migrating an Objective-C class to Swift using subclassing

   Following up on last week’s article on migrating an Objective-C class to Swift using extensions, I discuss an alternative approach: adding a Swift subclass to the Objective-C class you want to convert. More >

   August 9, 2018

5. Migrating an Objective-C class to Swift: a piecemeal approach

   A piecemeal migration of an existing Objective-C class to Swift often means adding a Swift extension to the class. I describe a technique how you can provide stored properties to the the Swift extension, even if those properties aren’t compatible with Objective-C. More >

   July 31, 2018