UIView.animateWithDuration(1, delay: 0.5, options: nil, animations: {...}, completion: nil)
为什么我的options:nil老是会被报错？说是“ Cannot invoke 'animateWithDuration' with an argument list of type '(Int, delay: Double, options: NilLiteralConvertible, animations: () -> (), completion: NilLiteralConvertible)'”
