[swift-users] extension on UISlider breaks interface builder??

[Jon Shier]

	In my experience, yes, it started with Xcode 8, though I don’t specifically remember extending types I was using in IB in Xcode 7.



Jon

> On Jul 14, 2017, at 11:54 PM, David Baraff <davidbaraff at gmail.com> wrote:
> 
>> 
>> On Jul 14, 2017, at 8:53 PM, Jon Shier via swift-users <swift-users at swift.org <mailto:swift-users at swift.org>> wrote:
>> 
>> 	Yep, known issue, fixed in Xcode 9 beta 3 according to the release notes. Hugely annoying, but comment out the extension, connect the outlet, and comment it back it and should work fine. 
> 
> thank you!  Just to clarify, this isn’t new breakage in xcode 9, but something broken in xcode 8, yes?
> all the more reason to want swift 4 and xcode 9 then...
>> 
>> 
>> Jon
>> 
>>> On Jul 14, 2017, at 11:51 PM, David Baraff via swift-users <swift-users at swift.org> wrote:
>>> 
>>> TL;DR
>>> Add an extension to UISlider and interface builder in xcode will no longer believe it has *any* actions.
>>> Is this a known issue?
>>> 
>>> 
>>> 1. I added a UISlider to a storyboard in xcode.  I right clicked on it, and saw the usual set of things, particularly, actions (sent events):
>>> 
>>> <PastedGraphic-1.tiff>
>>> 
>>> Next, I wrote this:
>>> 
>>> public protocol ModelDataValuedUIControl: class {
>>>   var xxcontrolValue:Any {
>>>       get set
>>>   }
>>> }
>>> 
>>> extension UISlider : ModelDataValuedUIControl {
>>>   public var xxcontrolValue:Any {
>>>       get {
>>>           return self.value
>>>       }
>>> 
>>>       set(newValue) {
>>>           self.value = newValue as! Float
>>>       }
>>>   }
>>> }
>>> 
>>> 
>>> Lo and behold, after compiling, interface builder *hates* sliders, because now the rightclick menu looks like this:
>>> <PastedGraphic-2.tiff>
>>> 
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>> 
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