CAShapeLayer 动画问题

Question

我有一个CAShapeLayer(下图(，用于绘制气泡。根据设计，这一切都可以正常工作，但是当我开始使用tableView.beginUpdates((和tableView.endUpdates((在tableView中调整它的大小时。我最终暂时拥有黑色的旧层。这看起来很糟糕。我真的很困惑如何解决这个问题。感觉层是黑色的，填充物像面具一样涂在上面。 我已经尝试了几种在不同位置添加/删除图层的方法。等等，但结果总是这样。

视频来描述它

override func draw(_ rect: CGRect) {
self.layer.backgroundColor = UIColor.clear.cgColor
let fillColor: UIColor = self.shapeColor
let shapeLayer = CAShapeLayer()
shapeLayer.contentsScale = UIScreen.main.scale
let path = UIBezierPath()
shapeLayer.fillColor = fillColor.cgColor
let width = self.bounds.size.width
let height = self.bounds.size.height
path.move(to: CGPoint(x: 3.02, y: height * 0.5))
path.move(to: CGPoint(x: 3.02, y: 24.9))
path.addLine(to: CGPoint(x: 3.02, y: 14.62))
path.addLine(to: CGPoint(x: 3.02, y: 14.62))
path.addCurve(to: CGPoint(x: 17.64, y: -0), controlPoint1: CGPoint(x: 3.02, y: 6.55),controlPoint2: CGPoint(x: 9.57, y: -0))
path.addLine(to: CGPoint(x: width - 15.85, y: 0))
path.addLine(to: CGPoint(x: width - 15.85, y: 0))
path.addCurve(to: CGPoint(x: width, y: 14.62), controlPoint1: CGPoint(x: width - 7.77, y: 0), controlPoint2: CGPoint(x: width, y: 6.55))
path.addLine(to: CGPoint(x: width, y: height - 15.1))
path.addLine(to: CGPoint(x: width, y: height - 15.1))
path.addCurve(to: CGPoint(x: width - 15.85, y: height), controlPoint1: CGPoint(x: width, y: height - 7.03), controlPoint2: CGPoint(x: width - 7.77, y: height))
path.addLine(to: CGPoint(x: 17.64, y: height))
path.addLine(to: CGPoint(x: 17.64, y: height))
path.addCurve(to: CGPoint(x: 8.69, y: height - 3.56), controlPoint1: CGPoint(x: 14.39, y: height),controlPoint2: CGPoint(x: 11.24, y: height - 1.57))
path.addLine(to: CGPoint(x: 8.79, y: height - 3.46))
path.addCurve(to: CGPoint(x: 0, y: height), controlPoint1: CGPoint(x: 7.27, y: height - 1.27), controlPoint2: CGPoint(x: 3.84, y: height + 0.51))
path.addCurve(to: CGPoint(x: 3.02, y: height - 14.1), controlPoint1: CGPoint(x: 4.06, y: height - 4.22), controlPoint2: CGPoint(x: 3.02, y: height - 9.62))
path.close()
if self.reverted {
let mirrorOverXOrigin: CGAffineTransform = CGAffineTransform(scaleX: -1.0, y: 1.0);
let translate: CGAffineTransform = CGAffineTransform(translationX: width, y: 0);
// Apply these transforms to the path
path.apply(mirrorOverXOrigin)
path.apply(translate)
}
path.fill()
shapeLayer.path = path.cgPath
shapeLayer.rasterizationScale = UIScreen.main.scale
shapeLayer.shouldRasterize = true
if let bubbleLayer = self.bubbleLayer {
self.layer.replaceSublayer(bubbleLayer, with: shapeLayer)
} else {
self.layer.insertSublayer(shapeLayer, at: 0)
}
self.bubbleLayer = shapeLayer
}
shapeLayer.path = path.cgPath
shapeLayer.rasterizationScale = UIScreen.main.scale
shapeLayer.shouldRasterize = true
self.layer.insertSublayer(shapeLayer, at: 0)
self.bubbleLayer?.removeFromSuperlayer()
self.bubbleLayer = shapeLayer
}

Answer 1

您的解决方案无法正常工作。 在动画块期间不调用Draw(_ :)。它是在tableView.endUpdates((之后绘制的，在UITableView结束动画之后。

Draw(_ :)- 我认为你根本不应该使用它来满足你的需求。

如果我能推荐你一些解决方案：

1( 在awakeFromNib：

override func awakeFromNib() {
super.awakeFromNib()
self.contentView.backgroundColor = self.shapeColor
self.contentView.layer.cornerRadius = 15
/** make  left view and attach it to the left bottom anchors with fixed size and draw into this view the shape of your left arrow***/
self.leftArrowView.isHidden = self.isReverted
/** make  right view and attach it to the right bottom anchors with fixed size and draw into this view the shape of your right arrow***/
self.rightArrowView.isHidden = !self.isReverted
}

2( 在prepareForReuse：

override func prepareForReuse() {
super.prepareForReuse()
self.leftArrowView.isHidden = self.isReverted
self.rightArrowView.isHidden = !self.isReverted
}

这应该会导致您的单元格顺利改变大小。