CABasicAnimation swift 不工作

Question

我刚从 obj C 迁移到 swift，我不确定为什么它不起作用，因为在 obj c 中它工作正常，请查看我的代码

这是我的代码

func addAnimationOnLayer( layer: CALayer, position: CGPoint, duration: TimeInterval, delay: TimeInterval, fromPosition: CGPoint, toPostion: CGPoint, key: String) {
        layer.setAffineTransform(CGAffineTransform(translationX: position.x, y: position.y))
        CATransaction.begin()
        CATransaction.setCompletionBlock {
            layer.setAffineTransform(CGAffineTransform(translationX: 0, y: 0))
        }
        let theAnimation = CABasicAnimation(keyPath: "transform.translation")
        theAnimation.isRemovedOnCompletion = false
        theAnimation.timingFunction = CAMediaTimingFunction(name:kCAMediaTimingFunctionEaseInEaseOut)
        theAnimation.fillMode = kCAFillModeForwards
        theAnimation.duration = duration
        theAnimation.beginTime = delay
        theAnimation.fromValue = fromPosition
        theAnimation.toValue = toPostion

        layer.add(theAnimation, forKey: key)
        CATransaction.commit()
    }

我用这个调用函数

self.addAnimationOnLayer(layer: self.logoImage.layer, position: CGPoint(x: 0, y:100), duration: 0.8, delay: 0.1, fromPosition: CGPoint(x: 0,y: 100), toPostion: CGPoint(x: 0,y: 0), key: "logoStartAnimation")

Answer 1

在致电CATransaction.begin() 之前，请尝试致电CATransaction.flush()。

您的代码将如下所示：

func addAnimationOnLayer( layer: CALayer, position: CGPoint, duration: TimeInterval, delay: TimeInterval, fromPosition: CGPoint, toPostion: CGPoint, key: String) {
    layer.setAffineTransform(CGAffineTransform(translationX: position.x, y: position.y))
    CATransaction.flush()
    CATransaction.begin()
    CATransaction.setCompletionBlock {
        layer.setAffineTransform(CGAffineTransform(translationX: 0, y: 0))
    }
    let theAnimation = CABasicAnimation(keyPath: "transform.translation")
    theAnimation.isRemovedOnCompletion = false
    theAnimation.timingFunction = CAMediaTimingFunction(name:kCAMediaTimingFunctionEaseInEaseOut)
    theAnimation.fillMode = kCAFillModeForwards
    theAnimation.duration = duration
    theAnimation.beginTime = delay
    theAnimation.fromValue = fromPosition
    theAnimation.toValue = toPostion

    layer.add(theAnimation, forKey: key)
    CATransaction.commit()
}

试一试，让我知道，我之前遇到过动画没有发生的问题，因为之前的动画残留了一些。