title: syntax for cgaffinetransformconcat in swift 3?
body: <p><strong>what is syntax for CGAffineTransformConcat in swift 3?</strong></p>
  
  <p>because on using it shows the error:</p>
  
  <blockquote>
    <p>use of unresolved identifier "CGAffineTranformConcat"</p>
  </blockquote>
  
  <p>please help me somebody</p>