ios - 删除按钮 ios swift 的所有动画

Question

我正在创建一个带有上下动画的应用程序。当我单击一个按钮时，标题文本向上移动，标签来自底部需要在 3 秒后向下移动。看下面的示例图片

这是原创设计。一旦我点击一个按钮动画工作正常。但是如果我点击相同的项目动画搞砸了。我尝试使用以下代码。

self.sub_item.layer.removeAllAnimations() 
item.layer.removeAllAnimations()
self.item.contentEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 0)
self.bottomConstraint.constant = 0
self.sub_item.hidden = false

UIView.animateWithDuration(0.25, delay: 0.0, options: UIViewAnimationOptions.CurveEaseInOut, animations: {
  self.bottomConstraint.constant = self.item.frame.height/3.0
  self.item.contentEdgeInsets = UIEdgeInsetsMake(-self.item.frame.height/3.0, 0, 0, 0)
  self.view.layoutIfNeeded()
}, completion: { finish in
   UIView.animateWithDuration(0.25, delay: 4.0, options:UIViewAnimationOptions.CurveEaseInOut, animations: {
     self.bottomConstraint.constant = 0
     self.nitem.contentEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 0)
     self.view.layoutIfNeeded()
   }, completion: {finish in
    self.sub_item.hidden = true
   })
})

注意:如果我的问题令人困惑，请提问。

Answer 1

只需重置约束，同时删除所有动画，就像您在点击按钮时所做的那样:-

//remove animation and reset constraints

 self.sub_item.layer.removeAllAnimations()
 item.layer.removeAllAnimations()
 self.bottomConstraint.constant = 0
 self.nitem.contentEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 0)
 self.view.layoutIfNeeded()
 self.view.setNeedsUpdateConstraints()
 self.view.updateConstraintsIfNeeded()
 self.sub_item.hidden = false

//start animation


UIView.animateWithDuration(0.25, delay: 0.0, options: UIViewAnimationOptions.BeginFromCurrentState, animations: {
    self.bottomConstraint.constant = self.item.frame.height/3.0
    self.item.contentEdgeInsets = UIEdgeInsetsMake(-self.item.frame.height/3.0, 0, 0, 0)
    self.view.layoutIfNeeded()
    }, completion: { finish in
        UIView.animateWithDuration(0.25, delay: 4.0, options: UIViewAnimationOptions.BeginFromCurrentState, animations: {
            self.bottomConstraint.constant = 0
            self.nitem.contentEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 0)
            self.view.layoutIfNeeded()
            }, completion: {finish in
            self.sub_item.hidden = true
        })
})