Swift 3 conversion : value of type 'characterset' has no member 'characterIsMember'
<p>I am currently converting my codes to swift 3 and i encounter the above mentioned error with the following codes.</p>

<pre><code> func containsAlphabets() -&gt; Bool {
    //Checks if all the characters inside the string are alphabets
    let set = NSCharacterSet.letters
    return self.utf16.contains( { return set.characterIsMember($0)  } )
}
</code></pre>

<p>Any kind souls can assist on this?</p>