[swift-users] Regression in Xcode8-beta6 Swift?

David Hart david at hartbit.com
Thu Aug 25 02:23:36 CDT 2016

You can’t call arbitrary functions on AnyObject anymore. Previously, you could do this:

let a: AnyObject = UIView()
a.hasPrefix(“test”) // This compiled (because hasPrefix(:_) exists on NSString), but would obviously crash

This is not allowed anymore.

> On 25 Aug 2016, at 03:33, Travis Griggs via swift-users <swift-users at swift.org> wrote:
> Upgrading to beta6 of Xcode8, I’ve read through various SE’s and made fixes as appropriate, but the following behavior I didn’t catch an explanation as to why its now an error where it was fine before.
> In a ViewController, I have something that looks like:
>    var addButton = UIButton(type: .custom)
>    var addPrompt = UILabel()
>    var timesButton = UIButton(type: .system)
>    var removeButton = UIButton(type: .system)
>    var menuButton = UIButton(type: .system)
>    func commonInit() {
>        [self.addButton, self.addPrompt, self.timesButton, self.removeButton, self.menuButton].forEach { control in
>            control.sizeToFit()
>            self.addSubview(control)
>    }
> This code was fine until the latest update. It seemed to a heterogenous array of UILabel and UIButtons was a homogeneous array of UIView objects. But now I get the errors:
>    Value of type ‘Any’ has no member ‘sizeToFit'
>    Cannot covert value of type ‘Any’ to expected argument type of ‘UIView’
> This seems like it might be related to SE-0116 (Import Objective-C id as Swift Any ) but I’m not sure why the inferencer can no longer find the shared parent type, where it could before.
> Aside, I can fix it by simply helping it a little, e.g.
>    [self.addButton, self.addPrompt, self.timesButton, self.removeButton, self.menuButton].forEach { (control:UIView) in...
> But remain curious why the inferencer can’t handle this for me anymore.
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