<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">The other concern with patterns like this is that they tend to lead to reference cycles due to unintentional closure capture.<div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre">        </span>David</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Dec 4, 2015, at 11:25 AM, Cole Kurkowski &lt;<a href="mailto:crk@fastmail.com" class="">crk@fastmail.com</a>&gt; wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">I agree that a closure is a much better solution to the target-action pattern in Swift, especially since you could pass a declared method with “self.functionToCall” which is basically a type safe version of the current paradigm. All of that said, I believe the reason it <b class="">doesn’t</b>&nbsp;work this way right now is compatibility with objective-c and Cocoa. I’d love to see this changed, as it’s one of the least Swifty things I have to use on a regular basis. I’m just not sure exactly how large of an effort it would be to make it compatible.<div class=""><br class=""></div><div class=""><div class="">Thanks for your time,</div><div class="">Cole Kurkowski</div><div class=""><blockquote type="cite" class=""><div class="">On Dec 4, 2015, at 12:49, Chris Byatt &lt;<a href="mailto:byatt.chris@gmail.com" class="">byatt.chris@gmail.com</a>&gt; wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">It feels a lot more Swift-like to me to allow a Selector argument to have the option of being a closure.<div class=""><br class=""></div><div class="">For example, instead of:</div><div class=""><br class=""></div><div class=""><pre class="default prettyprint prettyprinted" style="margin-top:0px;padding:5px;border:0px;font-size:13px;overflow:auto;width:auto;max-height:600px;background-color:rgb(238,238,238);font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,sans-serif;color:rgb(57,51,24);word-wrap:normal"><code style="margin:0px;padding:0px;border:0px;font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,sans-serif;white-space:inherit" class=""><span class="typ" style="margin:0px;padding:0px;border:0px;color:rgb(43,145,175)">UIBarButtonItem</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">(</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;">title</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">:</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;"> </span><span class="str" style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">"Press"</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">,</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;"> style</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">:</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;"> </span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">.</span><span class="typ" style="margin:0px;padding:0px;border:0px;color:rgb(43,145,175)">Done</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">,</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;"> target</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">:</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;"> </span><span class="kwd" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,139)">self</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">,</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;"> action</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">:</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;"> </span><span class="str" style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">"functionToCall"</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">)</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;">

func functionToCall</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">()</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;"> </span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">{</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;">
    </span><span class="com" style="margin:0px;padding:0px;border:0px;color:rgb(128,128,128)">// Do something</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;">
</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">}</span></code></pre>We should be able to do:</div><div class=""><br class=""></div><div class=""><pre class="default prettyprint prettyprinted" style="margin-top:0px;padding:5px;border:0px;font-size:13px;overflow:auto;width:auto;max-height:600px;background-color:rgb(238,238,238);font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,sans-serif;color:rgb(57,51,24);word-wrap:normal"><code style="margin:0px;padding:0px;border:0px;font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,sans-serif;white-space:inherit" class=""><span class="typ" style="margin:0px;padding:0px;border:0px;color:rgb(43,145,175)">UIBarButtonItem</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">(</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;">title</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">:</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;"> </span><span class="str" style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">"Press"</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">,</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;"> style</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">:</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;"> </span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">.</span><span class="typ" style="margin:0px;padding:0px;border:0px;color:rgb(43,145,175)">Done</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">,</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;"> target</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">:</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;"> </span><span class="kwd" style="margin:0px;padding:0px;border:0px;color:rgb(0,0,139)">self</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">,</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;"> action</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">:</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;"> </span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">{</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;">
    </span><span class="com" style="margin:0px;padding:0px;border:0px;color:rgb(128,128,128)">// Do Something</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px;">
</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px;">})</span></code></pre>For simple tasks it would be a lot neater, and indeed faster to code this way.</div><div class=""><br class=""></div><div class="">Thanks,</div><div class=""><br class=""></div><div class="">Chris</div></div>
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