[swift-evolution] extend trailing closure rule

[Matt Neuburg]

Well, I guess I didn't pick a strong enough case. Try this one:

        UIView.animate(withDuration:0.4, delay: 0, options: [.autoreverse]) {
            self.view.backgroundColor = UIColor.red()
        }

That doesn't compile. I'm suggesting that it would be cool if it did. m.

> On Jun 8, 2016, at 12:29 PM, Rimantas Liubertas <rimantas at gmail.com> wrote:
> 
>> 
>> That's ugly. I'd rather write:
>> 
>> UIView.animate(withDuration:0.4) {
>> self.v.backgroundColor = UIColor.red()
>> }
>> 
>> What stops me is that `animations:` is not eligible for trailing closure syntax, because it isn't the last parameter — `completion:` is.
> 
> Actually you can. UIView has three signatures ‘animateWithduration’:
> 
> class func animateWithDuration(_ duration: NSTimeInterval,
>                     animations animations: () -> Void)
> 
> class func animateWithDuration(_ duration: NSTimeInterval,
>                     animations animations: () -> Void,
>                     completion completion: ((Bool) -> Void)?)
> 
> class func animateWithDuration(_ duration: NSTimeInterval,
>                          delay delay: NSTimeInterval,
>                        options options: UIViewAnimationOptions,
>                     animations animations: () -> Void,
>                     completion completion: ((Bool) -> Void)?)
> 
> so your version is valid.
> 
> 
> Best regards,
> Rimantas

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