Property Observers in Swift

Seeing changes

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Before we start


Keywords and Terminology

This article


This article on the other hand covers Property Observers, and it is about time that I did just that.

The Repo

What is a Property Observer anyway?

The use of Property Observers

This would involve (perhaps) the use of a timer and perhaps a closure, and this is not a good approach for a well-coded App.

Much better would to be observe when changes are made, and then react accordingly. In steps Property Observers.

An example

This is then kicked off with an instance of the Game class, and playerOne won the first game! This means that we will set the score to be 1, and then print out the score. We will do that by using the following three lines:

The answer

What if the property is changed to the same value?

Let us write out this line:

So we have three lines that are then written to the console


The Repo makes things rather easier to follow in this project, and I do recommend you download this project.

If you’ve any questions, comments or suggestions please hit me up on Twitter

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