Animation code Error: Type of expression is ambiguous without more context

Question

我在Xcode 7 beta 2-

中输入了一些简单的动画代码

 UIView.animateWithDuration( 0.5, delay: 1, options: nil, animations: ({
        self.W.frame = CGRect(x: 107, y: 268, width: 30, height: 33)
        self.nameLabel.alpha = 0
        self.wd.alpha = 0

    } ), completion:{ finished in
        UIView.animateWithDuration(0.5, animations: ( { ()-> Void in self.wd.alpha = 1 } ), completion: {finished in
            UIView.animateWithDuration(0.5, delay: 1, options: nil, animations: ({()-> Void in
                self.greenLaunchScreenView.alpha = 0
                self.nameLabel.alpha = 0
                self.wd.alpha = 0
                self.W.alpha = 0
                self.launchScreenCircle.alpha = 0
                self.navigationController?.setNavigationBarHidden( false, animated: true )
            }), completion: nil )

            }
        )})

当我在 Xcode 6 中键入相同的代码时，它工作得很好，但它在 Xcode 7 beta 2 中不起作用，因为它给我一个错误- "Type of expression is ambiguous without more context" . 我怎样才能让这段代码在 Xcode 7 beta 中工作？

Answer 1

在Xcode7(Swift2)中，UIView.animateWithDuration中的参数options:请用[]代替nil。