<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="">You have the protocol conformance, why can’t you simply call the method directly?</div><br class=""><div><blockquote type="cite" class=""><div class="">On Dec 10, 2015, at 12:22 PM, Matthew Davies via swift-users <<a href="mailto:swift-users@swift.org" class="">swift-users@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">I'm building a URL router in which I'd like to pass a controller and a method. I don't want to instantiate all the controllers up front and pass the methods in as closures, nor do I want old controller instances still kept around. If there's a better way, I'm definitely open to any suggestions. I'm still learning the "Swift" way to do things.</div></div><div class="gmail_extra"><br clear="all" class=""><div class=""><div class="gmail_signature"><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div class=""><br class=""></div><div class=""><div style="color:rgb(136,136,136);font-size:12.8000001907349px;max-width:600px;direction:ltr" class=""><div style="max-width:470px;margin:8px 8px 0px 0px" class=""><table border="0" cellspacing="0" cellpadding="0" width="470" style="width:470px" class=""><tbody class=""><tr valign="top" class=""><td style="font-family:Arial;font-stretch:normal;font-size:14px;color:rgb(100,100,100);padding-left:10px" class=""><div class=""><b class="">Matthew Davies</b><br class="">Junior Developer, <a href="http://geostrategies.com/" target="_blank" class="">GeoStrategies</a></div><div class="">Director of Photography, <a href="http://offblockfilms.com/" target="_blank" class="">OffBlock Films</a></div><div style="color:rgb(141,141,141);font-size:13px;padding:5px 0px" class=""><a href="tel:209-225.3246" style="color:rgb(141,141,141);text-decoration:none" target="_blank" class="">209-225-3246</a> <span style="color:rgb(102,102,102);display:inline-block" class="">|</span> <span style="display:inline-block" class=""><a href="tel:209-202-3284" style="color:rgb(141,141,141);text-decoration:none" target="_blank" class="">209-202-3284</a></span> <span style="color:rgb(102,102,102);display:inline-block" class="">|</span> <span style="display:inline-block" class=""><a href="mailto:daviesgeek@gmail.com" style="color:rgb(141,141,141);text-decoration:none" target="_blank" class="">daviesgeek@gmail.com</a></span> <span style="color:rgb(102,102,102);display:inline-block" class="">|</span> <span style="white-space:nowrap;display:inline-block" class=""><a href="https://daviesgeek.com/" style="color:rgb(141,141,141);text-decoration:none" target="_blank" class="">daviesgeek.com</a></span></div><div style="margin-top:5px" class=""><a href="http://facebook.com/daviesgeek" style="color:rgb(17,85,204)" target="_blank" class=""><img src="https://s3.amazonaws.com/images.wisestamp.com/icons/facebook.png" width="16" height="16" class=""></a> <a href="http://us.linkedin.com/in/daviesgeek" style="color:rgb(17,85,204)" target="_blank" class=""><img src="https://s3.amazonaws.com/images.wisestamp.com/icons/linkedin.png" width="16" height="16" class=""></a> <a href="http://twitter.com/daviesgeek" style="color:rgb(17,85,204)" target="_blank" class=""><img src="https://s3.amazonaws.com/images.wisestamp.com/icons/twitter.png" width="16" height="16" class=""></a> <a href="http://daviesgeek.com/feed.xml" style="color:rgb(17,85,204)" target="_blank" class=""><img src="https://s3.amazonaws.com/images.wisestamp.com/icons/blogRSS.png" width="16" height="16" class=""></a> <a href="http://github.com/daviesgeek" style="color:rgb(17,85,204)" target="_blank" class=""><img src="https://s3.amazonaws.com/images.wisestamp.com/icons/github.png" width="16" height="16" class=""></a></div></td></tr></tbody></table></div><br class=""></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
<br class=""><div class="gmail_quote">On Thu, Dec 10, 2015 at 10:47 AM, Dan Stenmark <span dir="ltr" class=""><<a href="mailto:daniel.j.stenmark@gmail.com" target="_blank" class="">daniel.j.stenmark@gmail.com</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word" class=""><div class="">NSSelectorFromString() is still available in Swift, and you should be able to use the result of that in performSelector, though I’m hesitant to support this approach as it flies in the face of the safety Swift tries to enforce. I’m curious about your use case here; are you trying to create some kind of dynamic proxy for a remote object ala NSXPCConnection?</div><span class="HOEnZb"><font color="#888888" class=""><div class=""><br class=""></div><div class="">Dan</div></font></span><div class=""><div class="h5"><br class=""><div class=""><blockquote type="cite" class=""><div class="">On Dec 10, 2015, at 10:33 AM, Matthew Davies via swift-users <<a href="mailto:swift-users@swift.org" target="_blank" class="">swift-users@swift.org</a>> wrote:</div><br class=""><div class=""><div dir="ltr" style="font-family:Helvetica;font-size:12px;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" class=""><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Ooh okay. I think that should work for my purposes. Thanks.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br class=""></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Somewhat related to this, how would I then call a method dynamically on an instance of the class, after instantiating it?</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br class=""></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">---</div><div class="gmail_default"><div class="gmail_default"><font face="arial, helvetica, sans-serif" class="">class Graph {</font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif" class=""> func call(method: String) {</font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif" class=""> // Something goes here</font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif" class=""> }</font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif" class=""><br class=""></font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif" class=""> func redraw() -> String {</font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif" class=""> return "Redraws"</font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif" class=""> }</font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif" class="">}</font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif" class=""><br class=""></font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif" class="">let inst = Graph()</font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif" class="">inst.call("redraw")</font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif" class="">---</font></div></div></div><div class="gmail_extra" style="font-family:Helvetica;font-size:12px;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 clear="all" class=""><div class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div class=""><br class=""></div><div class=""><div style="color:rgb(136,136,136);font-size:12.8000001907349px;max-width:600px;direction:ltr" class=""><div style="max-width:470px;margin:8px 8px 0px 0px" class=""><table border="0" cellspacing="0" cellpadding="0" width="470" style="width:470px" class=""><tbody class=""><tr valign="top" class=""><td style="font-family:Arial;font-size:14px;color:rgb(100,100,100);padding-left:10px" class=""><div class=""><b class="">Matthew Davies</b><br class="">Junior Developer, <a href="http://geostrategies.com/" target="_blank" class="">GeoStrategies</a></div><div class="">Director of Photography,<span class=""> </span><a href="http://offblockfilms.com/" target="_blank" class="">OffBlock Films</a></div><div style="color:rgb(141,141,141);font-size:13px;padding:5px 0px" class=""><a href="tel:209-225.3246" style="color:rgb(141,141,141);text-decoration:none" target="_blank" class="">209-225-3246</a> <span style="color:rgb(102,102,102);display:inline-block" class="">|</span> <span style="display:inline-block" class=""><a href="tel:209-202-3284" style="color:rgb(141,141,141);text-decoration:none" target="_blank" class="">209-202-3284</a></span> <span style="color:rgb(102,102,102);display:inline-block" class="">|</span> <span style="display:inline-block" class=""><a href="mailto:daviesgeek@gmail.com" style="color:rgb(141,141,141);text-decoration:none" target="_blank" class="">daviesgeek@gmail.com</a></span> <span 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style="color:rgb(17,85,204)" target="_blank" class=""><img src="https://s3.amazonaws.com/images.wisestamp.com/icons/blogRSS.png" width="16" height="16" class=""></a> <a href="http://github.com/daviesgeek" style="color:rgb(17,85,204)" target="_blank" class=""><img src="https://s3.amazonaws.com/images.wisestamp.com/icons/github.png" width="16" height="16" class=""></a></div></td></tr></tbody></table></div><br class=""></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><br class=""><div class="gmail_quote">On Thu, Dec 10, 2015 at 10:18 AM, Daniel Dunbar<span class=""> </span><span dir="ltr" class=""><<a href="mailto:daniel_dunbar@apple.com" target="_blank" class="">daniel_dunbar@apple.com</a>></span><span class=""> </span>wrote:<br class=""><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div style="word-wrap:break-word" class="">Note that you can define a protocol which will allow your framework to instantiate the type, and to call methods on instances of that type. If you can structure your code in this fashion, it can be very elegant in that it doesn't require factory functions and it is type safe.<div class=""><br class=""></div><div class="">For example:</div><div class="">--</div><div class=""><div class="">struct GraphableDescription { }</div><div class=""><br class=""></div><div class="">protocol Graphable {</div><div class=""> <span class=""> </span>/// Construct a graphable item from a description.</div><div class=""> <span class=""> </span>init(description: GraphableDescription)</div><div class=""><br class=""></div><div class=""> <span class=""> </span>func graph()</div><div class="">}</div><div class=""><br class=""></div><div class="">// Example framework method.</div><div class="">func graphItem(description: GraphableDescription, graphable: Graphable.Type) {</div><div class=""> <span class=""> </span>// Instantiate the graphable.</div><div class=""> <span class=""> </span>let item = graphable.init(description: description)</div><div class=""><br class=""></div><div class=""> <span class=""> </span>// Graph it.</div><div class=""> <span class=""> </span>item.graph()</div><div class="">}</div><div class=""><br class=""></div><div class="">// Example Graphable client.</div><div class="">struct Circle: Graphable {</div><div class=""> <span class=""> </span>init(description: GraphableDescription) { }</div><div class=""><br class=""></div><div class=""> <span class=""> </span>func graph() { }</div><div class="">}</div><div class=""><br class=""></div><div class="">// Example framework client.</div><div class="">func foo() {</div><div class=""> <span class=""> </span>graphItem(GraphableDescription(), graphable: Circle.self)</div><div class="">}</div></div><div class="">--</div><div class=""><br class=""></div><div class=""><div class=""> - Daniel</div><div class=""><div class=""><div class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">On Dec 10, 2015, at 9:59 AM, Matthew Davies via swift-users <<a href="mailto:swift-users@swift.org" target="_blank" class="">swift-users@swift.org</a>> wrote:</div><br class=""><div class=""><div dir="ltr" class=""><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)<span class=""> </span><i class="">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 class=""></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 class=""></div><div class=""><br class=""></div></div></div><div class="gmail_extra"><br clear="all" class=""><div class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div class=""><br class=""></div><div class=""><div style="color:rgb(136,136,136);font-size:12.8000001907349px;max-width:600px;direction:ltr" class=""><div style="max-width:470px;margin:8px 8px 0px 0px" class=""><table border="0" cellspacing="0" cellpadding="0" width="470" style="width:470px" class=""><tbody class=""><tr valign="top" class=""><td style="font-family:Arial;font-size:14px;color:rgb(100,100,100);padding-left:10px" class=""><div class=""><b class="">Matthew Davies</b><br class="">Junior Developer, <a href="http://geostrategies.com/" target="_blank" class="">GeoStrategies</a></div><div class="">Director of Photography,<span class=""> </span><a href="http://offblockfilms.com/" target="_blank" class="">OffBlock Films</a></div><div style="color:rgb(141,141,141);font-size:13px;padding:5px 0px" class=""><a href="tel:209-225.3246" style="color:rgb(141,141,141);text-decoration:none" target="_blank" class="">209-225-3246</a> <span style="color:rgb(102,102,102);display:inline-block" class="">|</span> <span style="display:inline-block" class=""><a href="tel:209-202-3284" style="color:rgb(141,141,141);text-decoration:none" target="_blank" class="">209-202-3284</a></span> <span style="color:rgb(102,102,102);display:inline-block" class="">|</span> <span style="display:inline-block" class=""><a href="mailto:daviesgeek@gmail.com" style="color:rgb(141,141,141);text-decoration:none" target="_blank" class="">daviesgeek@gmail.com</a></span> <span style="color:rgb(102,102,102);display:inline-block" class="">|</span> <span style="white-space:nowrap;display:inline-block" class=""><a href="https://daviesgeek.com/" style="color:rgb(141,141,141);text-decoration:none" target="_blank" class="">daviesgeek.com</a></span></div><div style="margin-top:5px" class=""><a href="http://facebook.com/daviesgeek" style="color:rgb(17,85,204)" target="_blank" class=""><img src="https://s3.amazonaws.com/images.wisestamp.com/icons/facebook.png" width="16" height="16" class=""></a> <a href="http://us.linkedin.com/in/daviesgeek" style="color:rgb(17,85,204)" target="_blank" class=""><img src="https://s3.amazonaws.com/images.wisestamp.com/icons/linkedin.png" width="16" height="16" class=""></a> <a href="http://twitter.com/daviesgeek" style="color:rgb(17,85,204)" target="_blank" class=""><img src="https://s3.amazonaws.com/images.wisestamp.com/icons/twitter.png" width="16" height="16" class=""></a> <a href="http://daviesgeek.com/feed.xml" style="color:rgb(17,85,204)" target="_blank" class=""><img src="https://s3.amazonaws.com/images.wisestamp.com/icons/blogRSS.png" width="16" height="16" class=""></a> <a href="http://github.com/daviesgeek" style="color:rgb(17,85,204)" target="_blank" class=""><img src="https://s3.amazonaws.com/images.wisestamp.com/icons/github.png" width="16" height="16" class=""></a></div></td></tr></tbody></table></div><br class=""></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><br class=""><div class="gmail_quote">On Thu, Dec 10, 2015 at 9:30 AM, Jan Neumüller<span class=""> </span><span dir="ltr" class=""><<a href="mailto:swift-users@swift.org" target="_blank" class="">swift-users@swift.org</a>></span><span class=""> </span>wrote:<br class=""><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div style="word-wrap:break-word" class="">Please no factory madness in Swift. This stuff is bad enough in Java - don’t infect Swift with it.<div class=""><br class=""></div><div class="">Jan<br class=""><br class=""><div class=""><blockquote type="cite" class=""><div class=""><div class=""><div class="">On 10.12.2015, at 18:23, Jens Alfke via swift-users <<a href="mailto:swift-users@swift.org" target="_blank" class="">swift-users@swift.org</a>> wrote:</div><br class=""></div></div><div class=""><div style="word-wrap:break-word" class=""><div class=""><div class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">On Dec 10, 2015, at 7:26 AM, Harlan Haskins via swift-users <<a href="mailto:swift-users@swift.org" target="_blank" class="">swift-users@swift.org</a>> wrote:</div><br class=""><div class=""><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" class="">IIRC this isn’t possible because there’s no Runtime to query for classnames (it’s inherently unsafe anyway).</span></div></blockquote><div class=""><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" class=""><br class=""></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" class="">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" class=""><br class=""></div><blockquote type="cite" class=""><div class=""><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" class="">You might want to look into a better way of doing that you’re trying to do.</div></div></blockquote></div><br class=""><div class="">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 class=""><span style="white-space:pre-wrap" class=""> </span><a href="http://inessential.com/swiftdiary" target="_blank" class="">http://inessential.com/swiftdiary</a></div><div class=""><span style="white-space:pre-wrap" class=""> </span><a href="http://inessential.com/2015/07/20/swift_diary_1_class_or_struct_from_str" target="_blank" class="">http://inessential.com/2015/07/20/swift_diary_1_class_or_struct_from_str</a></div><div class=""><br class=""></div><div class="">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 class=""><br class=""></div><div class="">—Jens</div></div></div><img 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