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.error { color:#AA0000; }</style></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class="bloop_markdown"><p>I believe this is just a ‘nice to have’ shortcut. I wouldn’t mind to have this:</p>
<ul>
<li><code>willSet(newValue, oldValue)</code></li>
<li><code>didSet(newValue, oldValue)</code></li>
<li><code>$0</code> for <code>newValue</code> and <code>$1</code> for <code>oldValue</code></li>
</ul>
<p>It’s nothing for phase one, so we’ll have to defer this until next year where we’ll start talking about sugar/additional features for Swift 4.</p>
<p></p></div><div class="bloop_original_html"><style>body{font-family:Helvetica,Arial;font-size:13px}</style><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;"><br></div> <br> <div id="bloop_sign_1472288996657490944" class="bloop_sign"><div style="font-family:helvetica,arial;font-size:13px">-- <br>Adrian Zubarev<br>Sent with Airmail</div></div> <br><p class="airmail_on">Am 27. August 2016 um 08:47:38, Charlie Monroe via swift-evolution (<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>) schrieb:</p> <blockquote type="cite" class="clean_bq"><span><div><div></div><div>The newValue is already set in the property, so you just use that property. I don't see much benefit in having "newValue" instead of just accessing it:<br><br>var anonymousUserMode = false {<br> didSet {<br> if oldValue == self.anonymousUserMode {<br> return <br> }<br> <br> renderLoginOverlay(show: newValue)<br> }<br>}<br><br>And the same goes for willSet, where you have newValue, but not "oldValue", since oldValue is still in the stored property...<br><br>> On Aug 26, 2016, at 8:20 PM, Eric Miller via swift-evolution <swift-evolution@swift.org> wrote:<br>> <br>> Just an idea.<br>> <br>> I use didSet a lot, and it'd be nice to have a generic way to access the newValue.<br>> <br>> For UI modes:<br>> <br>> var anonymousUserMode = false { didSet {<br>> if oldValue == anonymousUserMode { return }<br>> renderLoginOverlay(show: anonymousUserMode)<br>> }}<br>> <br>> For animated display strings:<br>> <br>> var errorMessage: String? = nil { didSet {<br>> if oldValue == errorMessage { return }<br>> errorLabel.text = errorMessage<br>> // Do some sliding or hiding based on the new value<br>> }}<br>> <br>> Has the idea of using $0 / $1 or oldValue / newValue been considered?<br>> <br>> I'd like to be able to write this as:<br>> <br>> var anonymousUserMode = false { didSet {<br>> if oldValue == newValue { return }<br>> renderLoginOverlay(show: newValue)<br>> }}<br>> _______________________________________________<br>> swift-evolution mailing list<br>> swift-evolution@swift.org<br>> https://lists.swift.org/mailman/listinfo/swift-evolution<br><br>_______________________________________________<br>swift-evolution mailing list<br>swift-evolution@swift.org<br>https://lists.swift.org/mailman/listinfo/swift-evolution<br></div></div></span></blockquote></div><div class="bloop_markdown"><p></p></div></body></html>