title: How to add the random number value in swift
body: <p>I want a label to display 3 random numbers from 1 -10. Each time the displayed number will change randomly, and the number will appear in the label in 1 second before change to other number. After displaying 3 random number, it will give the total value of 3 numbers it appeared.</p>
  
  <p>For example: when I click button, the label give me a first number, 1 second later, the label give me the second number, 1 second later the label give me the third number then label stop and give me the total number (number1 + number2 + number3 )in the other result label.</p>
  
  <p>Could you give me some clues?</p>