That capital letter makes a real difference — Difficulty: Beginner | Easy | Normal | Challenging Prerequisites: No specific prerequisites are required for this article Video: Some find a video to be more to their liking, so here is the video support for this article What is self? self (with a lowercase s) is a property of an instance that holds the…

If we aren’t interested in nil — Keywords and Terminology Array: an ordered series of objects which are the same type (article) compactMap: Returns an array containing the non-nil results of calling the given transformation with each element of this sequence Force unwrapping: A method in which an optional is forced to return a concrete value. …

Make then final! — I’ve previously written about favouring composition over inheritance when coding in Swift. I can even pull in my own definition of inheritance here: Inheritance: A fundamental OO concept that enables new objects to take on the properties of existing objects. …

Proceed with caution — Difficulty: Beginner | Easy | Normal | Challenging You probably shoudn’t be doing this. You probably shouldn’t be doing this. Core Data can store data, but storing large images like this? Probably you want to use file. But I can see that you **really** want to store UIImage. …

Not every question. It depends. — There aren’t clear reasons for anything when we live in a complex and uncertain world. You will, however seem rather indecisive if you reply “It Depends” to a question about your favourite food. It is, though, probably the correct answer. Architecture You might have a favourite architecture. Actually, probably we…

It’s possible, but is it preferable? — Imagine that you are working to create views, and making each one have subviews placed in a scrollview. Nothing wrong with that, but it’s quite a bit of work isn’t it? What if we use UITableView as our basic view? How would we go about something like this. Read on…

Make it fit the content — Difficulty: Beginner | Easy | Normal | Challenging Terminology: Auto Layout: A constraint-based layout system intrinsicContentSize: The natural size for the receiving view, considering only properties of the view itself Prerequisites: There aren’t any, although you will need to set up a project, although you might like to read through subclassing…

They are SO useful — Difficulty: Beginner | Easy | Normal | Challenging Prerequisites: None Terminology: Property Wrapper: A property wrapper adds a layer of separation between code that manages how a property is stored and the code that defines a property The Context We can calculate the area of a square. It’s not too tricky, so we…

All Aboard and Manage! — Prerequisites: Be able to produce a “Hello, World!” iOS application (guide HERE) Video link: Here is similar material presented in a video format Terminology Retain cycles: This is the state when two objects hold weak references to one another. Since the first object’s reference count cannot be 0 until the second object is…