title: Updating UILabel and UIButton immediately
body: <p>In a project, I change a UILabel's text with setText, a UIButton's color and after that do a time consuming calculation, followed by an animation.</p>
  
  <p>However, the text's and color's change is reflected after the calculation is executed (and before the animation begins) however I want to reflect the changes immediately before calculation (as you guess it is a waiting text)</p>
  
  <p>How can I achieve this? </p>