Ios 如何为动画添加完成？

嘿，我想创建一个设置游戏应用程序，现在我想我的卡（UIView）移动到一个新位置。动画结束后，我希望此视图从超级视图中删除

   func btnUp(card: CardSubview, frame: CGRect) {

        let newPosition = CGRect(x: (self.superview?.frame.minX)!, y: (self.superview?.frame.maxY)!, width: card.bounds.width, height: card.bounds.height)
        //UIView.animate(withDuration: 3.0, animations: {card.frame = newPosition})
        UIView.animate(withDuration: 3.0, animations: {card.frame = newPosition}, completion: {if card.frame == newPosition {card.removeFromSuperview()}})

    }

这是可行的，但如果我想添加一个完成，我会得到以下错误：

无法将类型为“（）->（）”的值转换为所需的参数类型 “（（Bool）->Void”？”**

那么我做错了什么呢？

试试这个：

您需要设置

完成块

变量

func btnUp(card: CardSubview, frame: CGRect) {

    let newPosition = CGRect(x: (self.superview?.frame.minX)!, y: (self.superview?.frame.maxY)!, width: card.bounds.width, height: card.bounds.height)
    //UIView.animate(withDuration: 3.0, animations: {card.frame = newPosition})
    UIView.animate(withDuration: 3.0, animations: {
        card.frame = newPosition
        }, completion: { finish in
             if card.frame == newPosition {card.removeFromSuperview()

        }})
}

说：

完成

动画序列结束时要执行的块对象。这 块没有返回值，只接受一个 指示动画是否在开始之前实际完成 已调用完成处理程序

因此，您需要将该布尔参数指定给完成处理程序：

UIView.animate(withDuration: 3.0, animations: {card.frame = newPosition}, completion: { finish in
    if card.frame == newPosition {
         card.removeFromSuperview()
    }
})

可能重复的

UIView.animate(withDuration: 3.0, animations: {card.frame = newPosition}, completion: { finish in
    if card.frame == newPosition {
         card.removeFromSuperview()
    }
})