Auto Closure

gistfile1.txt

import UIKit
import XCPlayground

// Please enable simulator to view results in playground

extension UIView {
    class func animate(duration : NSTimeInterval, @autoclosure _ animations : () -> Void) {
        UIView.beginAnimations(nil, context: nil)
        UIView.setAnimationDuration(duration)
        animations()
        UIView.commitAnimations()
    }
}

let view = UIView(frame:CGRectMake(0, 0, 200, 180))
view.backgroundColor = .redColor()
XCPShowView("View", view)

UIView.animate(2.0, view.backgroundColor = .blueColor())