title: Initialize a button with a title from a Label in swift
body: <p>I want to initialize a button's title from a Label. I have this code:</p>
  
  <pre><code>let smallSquare = CGSize(width: 30, height: 30)
  let button = UIButton(frame: CGRect(origin: CGPointZero, size: smallSquare))
  </code></pre>
  
  <p>But, I do not know how I can initialize a title with my label:</p>
  
  <pre><code>let label = UILabel(frame: CGRectMake(0, 0, 200, 21))
  label.center = CGPointMake(160, 284)
  label.textAlignment = NSTextAlignment.Center
  label.text = "I'am a test label"
  </code></pre>
  
  <p>Normally, I use this property to add a title with a string: </p>
  
  <p><code>button.setTitle("Button Title",for: .normal)</code></p>
  
  <p>Is it possible to simply put my Label in my button's title?</p>
  
  <p>Thanks in advance</p>