title: What is reason of Warning "Pointer is missing a nullability type specifier"?
body: <pre><code>+ (UIColor*) getColorWithHexa(NSString*)hexString;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/QWB2F.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QWB2F.png" alt="enter image description here"></a>:</p>
  
  <p>This is a method definition in my class. It's causing a warning. What is cause of similar warnings and how can these be resolved?</p>
  
  <p>I am returning an UIColor object, while that question relates to blocks, which is given in comments.</p>
  
  <p>So, it's helpful.</p>