Swift 2：表達式在沒有更多上下文的情況下是模糊的

Question

class Example: NSObject, UIViewControllerAnimatedTransitioning, UIViewControllerTransitioningDelegate {

var aView : UIView!

UIView.animateWithDuration(duration, delay: 0.0, usingSpringWithDamping: 0.8, initialSpringVelocity: 0.8, options: nil, animations: {

       self.aView.transform = CGAffineTransformIdentity //This line is throwing the error mentioned in the Title


            }, completion: { finished in
                transitionContext.completeTransition(true)
      })


}

這在早期版本的Swift中有效，但在版本2中失敗並不確定原因

Answer 1

你只需要改變

UIView.animateWithDuration(duration,
  delay: 0.0,
  usingSpringWithDamping: 0.8,
  initialSpringVelocity: 0.8,
  options: nil,
  animations: {

有：

UIView.animateWithDuration(duration,
  delay: 0.0,
  usingSpringWithDamping: 0.8,
  initialSpringVelocity: 0.8,
  options: [],
  animations: {

只有改變的“選項”。