<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="">I think the below proposal also tries to pave over the difference between will and didSet, which are both important. In addition to unclear use of super.foo.<div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Dec 15, 2015, at 12:57 AM, Adrian Kashivskyy 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=""><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'm -1 on that, willSet and didSet are great tools for performing side effects (such as locking, for example). It was a major problem in Objective-C, as no easy solution (except overriding accessors) existed and still you'd have to write a lot of boilerplate code.<br class=""><div class="">
<div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><font color="#929292" class=""><br class="Apple-interchange-newline">Pozdrawiam – Regards,</font></div><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><font color="#929292" class="">Adrian Kashivskyy</font></div>
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<br class=""><div class=""><blockquote type="cite" class=""><div class="">Wiadomość napisana przez Nicky Gerritsen via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> w dniu 15.12.2015, o godz. 08:50:</div><br class="Apple-interchange-newline"><div class=""><div class="">But how does this work if `super` does not have `foo`, exactly like in this example? UIView does not have a member named `foo`, so it will not work.<br class="">Moreover, currently if creating a setter, you also need to supply a getter.<br class=""><br class="">Regards,<br class=""><br class="">Nicky<br class=""><br class="">On 12/15/2015 08:23 AM, Tino Heth via swift-evolution wrote:<br class=""><blockquote type="cite" class=""><blockquote type="cite" class="">It *is* odd, and I do the described didSet trick *all* the time.<br class=""><br class="">Stuff like:<br class=""></blockquote>The alternative wouldn’t be that complicated:<br class=""><br class="">public class MyView: UIView {<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>public var foo: Int {<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span><span class="Apple-tab-span" style="white-space:pre"> </span>set(value) {<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span><span class="Apple-tab-span" style="white-space:pre"> </span><span class="Apple-tab-span" style="white-space:pre"> </span>super.foo = value<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span><span class="Apple-tab-span" style="white-space:pre"> </span><span class="Apple-tab-span" style="white-space:pre"> </span>setNeedsDisplay()<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span><span class="Apple-tab-span" style="white-space:pre"> </span>}<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>}<br class="">}<br class=""><br class="">It’s just one line more, but three(!) keywords less that could be removed from the language; and I bet in the wild there are many thousand errors in subclasses of UIViewController that happen because the author didn’t remember wether he has to call super in viewDid…, loadView etc.<br class="">_______________________________________________<br class="">swift-evolution mailing list<br class=""><a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a><br class=""><a href="https://lists.swift.org/mailman/listinfo/swift-evolution" class="">https://lists.swift.org/mailman/listinfo/swift-evolution</a><br class=""></blockquote><br class="">_______________________________________________<br class="">swift-evolution mailing list<br class=""><a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a><br class=""><a href="https://lists.swift.org/mailman/listinfo/swift-evolution" class="">https://lists.swift.org/mailman/listinfo/swift-evolution</a><br class=""></div></div></blockquote></div><br class="">
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