Swift 使用'时显示错误；动画的持续时间'；

我是Swift新手，无法解决问题，请指导我

像这样使用它

 UIView.animateWithDuration(duration, delay: 0.0, options: option, animations: { () -> Void in
        self.btnCallButton.hidden = true
       }, completion: nil)

它显示以下错误

Cannot invoke 'animateWithDuration' with an argument list of type '(Float, delay: FloatLiteralConvertible, options: UIViewAnimationOptions, animations: () -> Void, completion: NilLiteralConvertible)'

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请给出所需建议，并提供一些链接，这些链接描述swift中的块

隐藏在swift中不可设置动画。如果要通过淡入/淡出隐藏/显示，请使用以下淡出代码

UIView.animate(withDuration: duration, delay: 0.0, options: options, animations: {
    self.btnCallButton.isHidden = false
    self.btnCallButton.alpha = 0.0
}, completion: { finished in
    self.btnCallButton.isHidden = true
})

和法登的追随者

UIView.animate(withDuration: duration, delay: 0.0, options: options, animations: {
    self.btnCallButton.isHidden = false
    self.btnCallButton.alpha = 1.0
}, completion: { finished in

})

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在结尾处添加

return

，如下所示

UIView.animate(withDuration: duration, delay: 0.0, options: option, animations: { () -> Void in
    self.btnCallButton.hidden = true
    return
}, completion: nil)

像这样：

UIView.animate(withDuration: 0.35) {
  // animate things
  return
}

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注意斯威夫特=摆动在回答问题之前，请阅读有用的标签弹出窗口。隐藏的可能副本无论如何都不可设置动画，因此不需要动画代码。