Swift facade design sample – The.Swift.Dev.


What’s a facade?

The title of the facade sample comes from actual life constructing structure.

one exterior facet of a constructing, often the entrance

In software program growth this definition might be translated to one thing like the whole lot that is outdoors, hiding all the interior components. So the principle function of a facade is to offer a phenomenal API over some extra advanced ugly ones. 😅

Normally the facade design sample comes useful if in case you have two or extra separate subsystems that should work collectively with a view to accomplish some type of duties. It will possibly disguise the underlying complexity, plus if something adjustments contained in the hidden strategies, the interface of the facade can nonetheless stay the identical. 👍

An actual-life facade sample instance

I promised a fast demo, so we could say an software with a toggle button that activates or off a selected settings. If the consumer faucets it, we modify the underlying settings worth within the default storage, plus we additionally need to play a sound as an additional suggestions for the given enter. That is three various things grouped collectively. 🎶

func toggleSettings() {
    
    let settingsKey = "my-settings"

    let originalValue = UserDefaults.customary.bool(forKey: settingsKey)
    let newValue = !originalValue

    UserDefaults.customary.set(newValue, forKey: settingsKey)
    UserDefaults.customary.synchronize()

    
    AudioServicesPlaySystemSound(1054);

    
    self.switchButton.setOn(newValue, animated: true)
}

Congratulations, we have simply created the simplest facade! If this code appears acquainted to you, which means you have already got utilized facades in your previous.

After all issues might be extra difficult, for instance if in case you have an internet service and it’s essential to add some information and an attachment file, you may also write a facade to cover the underlying complexity of the subsystems.

Facades are very easy to create, typically you will not even discover that you’re utilizing one, however they are often extraordinarily useful to cover, decouple or simplify issues. If you wish to study extra about them, please examine the linked articles. 😉