Why IBOutlet is nil?

When you override the loadView method, the it is your responsibility to init your subviews. Since you override it, the views from interface builder do not get the chance to convert to cocoa objects and thus outlets remain nil.

Why are IBOutlets weak in Swift?

Outlets that you create will therefore typically be weak by default, because: Outlets that you create to, for example, subviews of a view controller’s view or a window controller’s window, are arbitrary references between objects that do not imply ownership.

Should IBOutlets be weak or strong?

The official answer from Apple is that IBOutlets should be strong. The only case when an IBOutlet should be weak is to avoid a retain cycle. A strong reference cycle can result in memory leaks and app crashes.

What is IBAction and IBOutlet in Swift?

@IBAction is similar to @IBOutlet , but goes the other way: @IBOutlet is a way of connecting code to storyboard layouts, and @IBAction is a way of making storyboard layouts trigger code. This method takes one parameter, called sender . It’s of type UIButton because we know that’s what will be calling the method.

How do I connect IBOutlet to storyboard?

drag a “custom view” view from the object library to your storyboard scene. CTRL-drag from the view to the viewController. You should get presented with a list of suitable items to connect to. Your IBOutlet should be in the list.

What is awake from nib?

The nib-loading infrastructure sends an awakeFromNib message to each object recreated from a nib archive, but only after all the objects in the archive have been loaded and initialized. When an object receives an awakeFromNib message, it is guaranteed to have all its outlet and action connections already established.

Should Iboutlets be optional or implicitly unwrapped?

Optionals Are Safe The downside is that you need to work with an optional. To access the value stored in the optional, you need to safely unwrap it. If you want to take a shortcut by force unwrapping the optional, then you might as well have declared the outlet as an implicitly unwrapped optional in the first place.

What is awakeFromNib in Swift?

From Apple documentation: awakeFromNib : The nib-loading infrastructure sends an awakeFromNib message to each object recreated from a nib archive, but only after all the objects in the archive have been loaded and initialized.