Question

这是我的代码：

  UIView.animate(withDuration: 2.5, animations: {
                        animatingScoreCircle.alpha = 0.0
                        let screenSize = UIScreen.main.bounds
                        let screenHeight = screenSize.height * 0.10
                        animatingScoreCircle.center.y += screenHeight
                    })

我想要的是，图像视图将从原始center.y位置向上移动，占当前屏幕大小的10％。但现在，它从最终位置（原始中心+屏幕高度的10％）到我想要的图像，到原始中心y。所以它是逆转的。所以它应该是：

步骤1：图像应处于正常状态，即center.y 第2步：图像应该慢慢进入最终状态，即center.y + 10

但现在好了：

步骤1：图像从center.y + 10开始第2步：图像缓慢移动到原始中心如果我将+=更改为-=，它会执行相同的操作，但现在图像从下方传到原始center.y位置。

我已经尝试过了：

                let originalCenterYForScoreCircle = animatingScoreCircle.center.y
                let screenSize = UIScreen.main.bounds
                let screenHeight = screenSize.height * 0.10
                animatingScoreCircle.center.y = screenHeight
                UIView.animate(withDuration: 2.5, animations: {
                    animatingScoreCircle.alpha = 0.0
                    animatingScoreCircle.center.y = originalCenterYForScoreCircle
                })

但它有相同的结果。如何修复此代码？谢谢。

编辑：我正在使用自动布局，我正在制作纸牌游戏。当用户点击UIButton时，我想使用动画使其看起来更好。所以这就是我打电话的动画。当用户点击按钮时，将触发此动画。该功能自动调整该按钮的约束。之后，我想使用上面描述的动画。这是更多代码：

let animatingScoreCircle = UIImageView()
                    animatingScoreCircle.image = UIImage(named: "emptyPicture")
                    animatingScoreCircle.layer.cornerRadius = animatingScoreCircle.frame.size.width / 2
                    animatingScoreCircle.clipsToBounds = true
                    animatingScoreCircle.translatesAutoresizingMaskIntoConstraints = false
                    view.addSubview(animatingScoreCircle)
                    let horizontalConstraint = animatingScoreCircle.centerXAnchor.constraint(equalTo: sender.centerXAnchor)
                    let verticalConstraint = animatingScoreCircle.centerYAnchor.constraint(equalTo: sender.centerYAnchor)
                    let heigthContraint = animatingScoreCircle.heightAnchor.constraint(equalTo: sender.heightAnchor, multiplier: 1.0)
                    let widthConstraint = animatingScoreCircle.widthAnchor.constraint(equalTo: sender.widthAnchor, multiplier: 1.0)
                    NSLayoutConstraint.activate([horizontalConstraint, verticalConstraint, heigthContraint, widthConstraint])
                    let originalCenterYForScoreCircle = animatingScoreCircle.center.y
                    let screenSize = UIScreen.main.bounds
                    let screenHeight = screenSize.height * 0.10
                    animatingScoreCircle.center.y = screenHeight
                    UIView.animate(withDuration: 2.5, animations: {
                        animatingScoreCircle.alpha = 0.0
                        animatingScoreCircle.center.y = originalCenterYForScoreCircle
                    })

                }

当用户点击按钮时会调用此方法。

UIView.animation正在颠倒我的动画

0 个答案: