What happens when calling setNeedsLayout compared to layoutIfNeeded in terms of execution synchrony?

The setNeedsLayout method marks a view as requiring layout update, but the update itself occurs asynchronously — in the next interface update cycle. That is, after calling setNeedsLayout, the system will defer the call to layoutSubviews until the next rendering cycle.

In contrast, layoutIfNeeded performs layout synchronously if the view is marked as needing an update. That is, calling layoutIfNeeded immediately invokes layoutSubviews if necessary, and updates the layout of elements immediately.

Example:

view.setNeedsLayout() // Deferred layout
// layoutSubviews has not yet been called here

view.layoutIfNeeded() // Immediate layout if needed
// layoutSubviews has already been called here