How to define functionality to be executed after a ui transformation

问题

I have an element I need to animate and I followed this question to transform it as follows.

I defined a button that when I click it, the view would move horizontally. However, I need to define certain functions after the transformation (For example, I would need the print statement to be working after the transformation is completed in 5 seconds). But currently, it is printed simultaneously.

How can I define functionality to be done after the transformation.

   @IBAction func mybutton(_ sender: Any) {
        UIView.animate(withDuration: 5.0) {
            
            self.hhview.transform = CGAffineTransform(translationX: -160, y: 0)
            
            print("Voila!")
        }
        
    }

回答1:

You can use a completion handler to execute code after the transformation:

UIView.animate(withDuration: 5.0) {
    self.hhview.transform = CGAffineTransform(translationX: -160, y: 0)
} completion: { _ in
    print("Completed")
}

来源：https://stackoverflow.com/questions/65640960/how-to-define-functionality-to-be-executed-after-a-ui-transformation