<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=""><div class="">Hi everybody,</div><div class=""><br class=""></div>I do agree with Kevin : trailing closures is only a possibility offered by the language, you are not forced to use it.<div class="">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 class=""><br class=""></div><div class="">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 class=""><br class=""></div><div class="">-1 for me thus.</div><div class=""><br class=""></div><div class="">Jerome<br class=""><div class=""><br class=""><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 04 Jan 2016, at 19:52, Kevin Ballard via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
<title class=""></title>
<div class=""><div class="">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 class=""></div>
<div class=""> </div>
<div class="">-Kevin Ballard<br class=""></div>
<div class=""> </div>
<div class="">On Mon, Jan 4, 2016, at 04:45 AM, QQ Mail via swift-evolution wrote:<br class=""></div>
<blockquote type="cite" class=""><div class="">Hi, All: <br class=""></div>
<div class=""><span style="white-space:pre;" class=""></span>trailing closure is good for most cases, but sometimes it is also make code unclear, for example: <br class=""></div>
<div class=""> </div>
<div class=""><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;" class=""><span class="colour" style="color:rgb(112, 61, 170)">UIView</span>.<span class="colour" style="color:rgb(61, 29, 129)">animateWithDuration</span>(<span class="colour" style="color:rgb(39, 42, 216)">0.3</span>, animations: { () -> <span class="colour" style="color:rgb(112, 61, 170)">Void</span> <span class="colour" style="color:rgb(187, 44, 162)">in</span><br class=""></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);" class=""><span class="colour" style=""></span>// animation code here<br class=""></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;" class=""> }) { (Bool) -> <span class="colour" style="color:rgb(112, 61, 170)">Void</span> <span class="colour" style="color:rgb(187, 44, 162)">in</span><br class=""></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);" class=""><span class="colour" style=""></span>// completion code here<br class=""></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;" class="">}<br class=""></div>
</div>
<div class=""> </div>
<div class="">the label been removed and the code also not aligned well. <br class=""></div>
<div class="">I would like to write like this: <br class=""></div>
<div class=""> </div>
<div class=""><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);" class=""><span class="colour" style="color:rgb(112, 61, 170)">UIView</span><span class="colour" style="">.</span>animateWithDuration<span class="colour" style="">(</span><span class="colour" style="color:rgb(39, 42, 216)">0.3</span><span class="colour" style="">,</span><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; min-height: 13px;" class=""><br class=""></div><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;" class=""> animations: { () -> <span class="colour" style="color:rgb(112, 61, 170)">Void</span> <span class="colour" style="color:rgb(187, 44, 162)">in</span><br class=""></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);" class=""><span class="colour" style=""></span>// animation code here<br class=""></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;" class=""> },<br class=""></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;" class=""> completion: { Bool -> <span class="colour" style="color:rgb(112, 61, 170)">Void</span> <span class="colour" style="color:rgb(187, 44, 162)">in</span><br class=""></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);" class=""><span class="colour" style=""></span>// completion code here<br class=""></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;" class=""> }<br class=""></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-size:11px;line-height:normal;font-family:Menlo;" class="">)<br class=""></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;" class=""> </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;" class="">It is possible, just every time you have to write it manually. It’s a little wast.<br class=""></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;" class="">So I have a thought, since we already know this function is not well suit for trailing <br class=""></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;" class="">closure, can we add a attribute to disable it, for example: <br class=""></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;" class=""> </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;" class=""><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;color:rgb(187, 44, 162);" class="">extension<span class="colour" style=""></span><span class="colour" style="color:rgb(112, 61, 170)">UIView</span><span class="colour" style=""> {</span><br class=""></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;min-height:13px;" class=""> </div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;" class=""><span class="colour" style="color:rgb(255, 40, 7)">@disable_trailing_closure</span><br class=""></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;" class=""><span class="colour" style="color:rgb(187, 44, 162)"> public</span> <span class="colour" style="color:rgb(187, 44, 162)">static</span> <span class="colour" style="color:rgb(187, 44, 162)">func</span> animateWithDuration(duration:<span class="colour" style="color:rgb(112, 61, 170)">NSTimeInterval</span>, animations:()-><span class="colour" style="color:rgb(112, 61, 170)">Void</span>, completion:()-><span class="colour" style="color:rgb(112, 61, 170)">Void</span>) {<br class=""></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;color:rgb(0, 132, 0);" class=""><span class="colour" style=""></span>// implementations ...<br class=""></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;" class=""> }<br class=""></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;" class="">}<br class=""></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;" class=""> </div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;" class="">I also found another one have issue for this too. link: <a href="http://www.natashatherobot.com/swift-trailing-closure-syntax/" class="">http://www.natashatherobot.com/swift-trailing-closure-syntax/</a><br class=""></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;" class="">what do you think?<br class=""></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;" class=""> </div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;" class="">Best Regards<br class=""></div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;" class=""> </div>
<div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;line-height:normal;" class="">ChenYungui<br class=""></div>
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