Everyone, <div><br></div><div>The sticking point here is that xcode generates the first syntax automatically. </div><div><br></div><div>Simply filing a radar about this would be useless, so I believe the original proposal is meant to sort-of "light a fire" under the Xcode team; by introducing a new language feature they would be forced to support it. </div><div><br></div><div>Personally, I think it should just be fixed in Xcode as well, but it's not that simple. <br><br><div class="gmail_quote"><div dir="ltr">On Tue, Jan 5, 2016, 8:35 AM Jérôme Duquennoy <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><div>Hi everybody,</div><div><br></div>I do agree with Kevin : trailing closures is only a possibility offered by the language, you are not forced to use it.<div>In the case you show, I agree that the second syntax is more readable than the first one. Good news is : it does compile :-).</div><div><br></div><div>I think adding a specific keyword or annotation to locally forbid trailing closure would add complexity to the language for no real advantage.</div><div><br></div><div>-1 for me thus.</div><div><br></div><div>Jerome</div></div><div style="word-wrap:break-word"><div><br><div><br><div><br><div><blockquote type="cite"><div>On 04 Jan 2016, at 19:52, Kevin Ballard via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> wrote:</div><br><div>
<div><div>What's the point of this? What problem does it solve? If you don't want a trailing closure, just don't use trailing closure syntax. I don't see what benefit there is in explicitly annotating the function to disallow trailing closure syntax with it; just because you don't want to use trailing closure syntax doesn't mean nobody should be able to use it. And other people using it shouldn't affect you.<br></div>
<div> </div>
<div>-Kevin Ballard<br></div>
<div> </div>
<div>On Mon, Jan 4, 2016, at 04:45 AM, QQ Mail via swift-evolution wrote:<br></div>
<blockquote type="cite"><div>Hi, All: <br></div>
<div><span style="white-space:pre-wrap"></span>trailing closure is good for most cases, but sometimes it is also make code unclear, for example: <br></div>
<div> </div>
<div><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo"><span style="color:rgb(112,61,170)">UIView</span>.<span style="color:rgb(61,29,129)">animateWithDuration</span>(<span style="color:rgb(39,42,216)">0.3</span>, animations: { () -> <span style="color:rgb(112,61,170)">Void</span> <span style="color:rgb(187,44,162)">in</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,132,0)"><span></span>// animation code here<br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo"> }) { (Bool) -> <span style="color:rgb(112,61,170)">Void</span> <span style="color:rgb(187,44,162)">in</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,132,0)"><span></span>// completion code here<br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo">}<br></div>
</div>
<div> </div>
<div>the label been removed and the code also not aligned well. <br></div>
<div>I would like to write like this: <br></div>
<div> </div>
<div><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(61,29,129)"><span style="color:rgb(112,61,170)">UIView</span><span>.</span>animateWithDuration<span>(</span><span style="color:rgb(39,42,216)">0.3</span><span>,</span><br></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo;min-height:13px"><br></div><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo"> animations: { () -> <span style="color:rgb(112,61,170)">Void</span> <span style="color:rgb(187,44,162)">in</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,132,0)"><span></span>// animation code here<br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo"> },<br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo"> completion: { Bool -> <span style="color:rgb(112,61,170)">Void</span> <span style="color:rgb(187,44,162)">in</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,132,0)"><span></span>// completion code here<br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo"> }<br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo">)<br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;min-height:13px"> </div>
</div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;min-height:13px">It is possible, just every time you have to write it manually. It’s a little wast.<br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;min-height:13px">So I have a thought, since we already know this function is not well suit for trailing <br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;min-height:13px">closure, can we add a attribute to disable it, for example: <br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;min-height:13px"> </div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;min-height:13px"><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;color:rgb(187,44,162)">extension<span></span><span style="color:rgb(112,61,170)">UIView</span><span> {</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;min-height:13px"> </div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="color:rgb(255,40,7)">@disable_trailing_closure</span><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"><span style="color:rgb(187,44,162)"> public</span> <span style="color:rgb(187,44,162)">static</span> <span style="color:rgb(187,44,162)">func</span> animateWithDuration(duration:<span style="color:rgb(112,61,170)">NSTimeInterval</span>, animations:()-><span style="color:rgb(112,61,170)">Void</span>, completion:()-><span style="color:rgb(112,61,170)">Void</span>) {<br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;color:rgb(0,132,0)"><span></span>// implementations ...<br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"> }<br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal">}<br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"> </div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal">I also found another one have issue for this too. link: <a href="http://www.natashatherobot.com/swift-trailing-closure-syntax/" target="_blank">http://www.natashatherobot.com/swift-trailing-closure-syntax/</a><br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal">what do you think?<br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"> </div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal">Best Regards<br></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal"> </div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal">ChenYungui<br></div>
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