title: IOS: Adjust UIButton height depend on title text using Autolayout?
body: <p>I have a <code>UIButton</code> and it can change the title at the runtime. Therefore, I want to increase the <code>UIButton</code> height depend on the title text for display full text by using <code>AutoLayout</code>.     </p>
  
  <p>I can increase the <code>UILabel</code> height by set the <code>height constraint</code> to "Greater than or Equal" but it not work with <code>UIButton</code>.<br>
  I have used <code>[myButton sizeToFit]</code> but it only increase the <code>UIButon</code> width (not increase height).  </p>
  
  <p>My current <code>UIButton</code> properties now is<br>
   - constraint height: 30 
   - leading : 15
   - trailing: 15
   - top: 5
   - fontsize: 12</p>
  
  <p><strong>UPDATE</strong><br>
  I created an IBOutlet for constraint height of <code>UIButton</code> for changing the height as <code>@NSNood</code> said.<br>
  Then I need to use <code>\n</code> in title text to split line.<br>
  But I don't know where should I put the <code>\n</code>? </p>
  
  <p><strong>Here is the <code>Button</code> that I want in portrait</strong></p>
  
  <p><a href="https://i.stack.imgur.com/JpU5V.png" rel="noreferrer"><img src="https://i.stack.imgur.com/JpU5V.png" alt="enter image description here"></a></p>
  
  <p><strong>Here is the <code>Button</code> that I want in landscape</strong>
  <a href="https://i.stack.imgur.com/8XCjj.png" rel="noreferrer"><img src="https://i.stack.imgur.com/8XCjj.png" alt="enter image description here"></a></p>
  
  <p>How can I determine the place to put <code>\n</code>?</p>
  
  <p>Please guide me how to achieve it with <code>AutoLayout</code>. Any help would be appreciated.  </p>