使用 'animateWithDuration' 时显示错误

Question

我是Swift的新人，所以无法弄清楚问题，请指导我

喜欢使用它

 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)'

请提供所需的建议并提供一些描述 swift

中的块的链接

Answer 1

Hidden 在 Swift 中不可设置动画。如果你想通过 fade in/out hide/show 使用以下代码进行 fadeout

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
})

以及 fadein 的后续

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

})

Answer 2

在闭包末尾添加 return 作为

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

Answer 3

像这样：

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

使用 'animateWithDuration' 时显示错误

Showing error while using 'animateWithDuration'

swift

block

uiviewanimation