title: implicit conversion of int to NSString is disallowed with arc in Objective-C
body: <p><a href="https://i.stack.imgur.com/s6nPx.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/s6nPx.png" alt="enter image description here"></a><br>
  Could anybody suggest where I'm going wrong? </p>