How to trigger UIButton action programmatically

UIButton has a method to invoke the targets/selectors that are linked to a certain control event:

[button sendActionsForControlEvents:UIControlEventTouchUpInside];

2022 Swift syntax:

someButton.sendActions(for: .primaryActionTriggered)

Swift 3.0/4.0/5.0

button.sendActions(for: .touchUpInside)