<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><div class="gmail_default">I don't really like the idea of a factory function, but unfortunately that might be the only way to do it :( However, due to my specific use case, I don't think a factory function will work. I'm working on a framework that will need to both instantiate the class from a string (or class type) <i>and</i> call methods dynamically on it. Which, I'm not sure I can do in the build tools that are provided in the open source package. Foundation hasn't been fully implemented and is missing a lot of the methods that would allow this to work.</div><div class="gmail_default"><br></div><div class="gmail_default">@Jens thanks for that blog post. I'll have to make sure I check back to see what his solution is for it.</div><div class="gmail_default"><br></div><div><br></div></div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><br></div><div><div style="color:rgb(136,136,136);font-size:12.8000001907349px;max-width:600px;direction:ltr"><div style="max-width:470px;margin:8px 8px 0px 0px"><table border="0" cellspacing="0" cellpadding="0" width="470" style="width:470px"><tbody><tr valign="top"><td style="font-family:Arial;font-stretch:normal;font-size:14px;color:rgb(100,100,100);padding-left:10px"><div><b>Matthew Davies</b><br>Junior Developer, <a href="http://geostrategies.com" target="_blank">GeoStrategies</a></div><div>Director of Photography, <a href="http://offblockfilms.com" target="_blank">OffBlock Films</a></div><div style="color:rgb(141,141,141);font-size:13px;padding:5px 0px"><a href="tel:209-225.3246" style="color:rgb(141,141,141);text-decoration:none" target="_blank">209-225-3246</a> <span style="color:rgb(102,102,102);display:inline-block">|</span> <span style="display:inline-block"><a href="tel:209-202-3284" style="color:rgb(141,141,141);text-decoration:none" target="_blank">209-202-3284</a></span> <span style="color:rgb(102,102,102);display:inline-block">|</span> <span style="display:inline-block"><a href="mailto:daviesgeek@gmail.com" style="color:rgb(141,141,141);text-decoration:none" target="_blank">daviesgeek@gmail.com</a></span> <span style="color:rgb(102,102,102);display:inline-block">|</span> <span style="white-space:nowrap;display:inline-block"><a href="https://daviesgeek.com/" style="color:rgb(141,141,141);text-decoration:none" target="_blank">daviesgeek.com</a></span></div><div style="margin-top:5px"><a href="http://facebook.com/daviesgeek" style="color:rgb(17,85,204)" target="_blank"><img src="https://s3.amazonaws.com/images.wisestamp.com/icons/facebook.png" width="16" height="16"></a> <a href="http://us.linkedin.com/in/daviesgeek" style="color:rgb(17,85,204)" target="_blank"><img src="https://s3.amazonaws.com/images.wisestamp.com/icons/linkedin.png" width="16" height="16"></a> <a href="http://twitter.com/daviesgeek" style="color:rgb(17,85,204)" target="_blank"><img src="https://s3.amazonaws.com/images.wisestamp.com/icons/twitter.png" width="16" height="16"></a> <a href="http://daviesgeek.com/feed.xml" style="color:rgb(17,85,204)" target="_blank"><img src="https://s3.amazonaws.com/images.wisestamp.com/icons/blogRSS.png" width="16" height="16"></a> <a href="http://github.com/daviesgeek" style="color:rgb(17,85,204)" target="_blank"><img src="https://s3.amazonaws.com/images.wisestamp.com/icons/github.png" width="16" height="16"></a></div></td></tr></tbody></table></div><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
<br><div class="gmail_quote">On Thu, Dec 10, 2015 at 9:30 AM, Jan Neumüller <span dir="ltr"><<a href="mailto:swift-users@swift.org" target="_blank">swift-users@swift.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Please no factory madness in Swift. This stuff is bad enough in Java - don’t infect Swift with it.<div><br></div><div>Jan<br>
<br><div><blockquote type="cite"><div><div class="h5"><div>On 10.12.2015, at 18:23, Jens Alfke via swift-users <<a href="mailto:swift-users@swift.org" target="_blank">swift-users@swift.org</a>> wrote:</div><br></div></div><div><div style="word-wrap:break-word"><div><div class="h5"><br><div><blockquote type="cite"><div>On Dec 10, 2015, at 7:26 AM, Harlan Haskins via swift-users <<a href="mailto:swift-users@swift.org" target="_blank">swift-users@swift.org</a>> wrote:</div><br><div><span style="font-family:Alegreya-Regular;font-size:15px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:none;display:inline!important">IIRC this isn’t possible because there’s no Runtime to query for classnames (it’s inherently unsafe anyway).</span></div></blockquote><div><div style="font-family:Alegreya-Regular;font-size:15px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div></div><div style="font-family:Alegreya-Regular;font-size:15px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">It’s not unsafe if you specify a base class/protocol that the loaded class must conform to.</div><div style="font-family:Alegreya-Regular;font-size:15px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><blockquote type="cite"><div><div style="font-family:Alegreya-Regular;font-size:15px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">You might want to look into a better way of doing that you’re trying to do.</div></div></blockquote></div><br><div>I disagree with “a better way” — “a workaround” is how I’d rephrase it. This kind of dynamism is often the best tool for the job, and a lot of Cocoa developers are frustrated by its absence in Swift. For example, there’s a series of blog posts from earlier this year by the highly respected Brent Simmons [NetNewsWire, MarsEdit, Glassboard, etc., currently at Omni]:</div><div><span style="white-space:pre-wrap"> </span><a href="http://inessential.com/swiftdiary" target="_blank">http://inessential.com/swiftdiary</a></div><div><span style="white-space:pre-wrap"> </span><a href="http://inessential.com/2015/07/20/swift_diary_1_class_or_struct_from_str" target="_blank">http://inessential.com/2015/07/20/swift_diary_1_class_or_struct_from_str</a></div><div><br></div><div>The workaround I’d suggest is a factory function that contains a switch statement that matches class names and returns newly initialized instances.</div><div><br></div><div>—Jens</div>
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