我正在编写一个应用程序，其中我需要使用先前定义的bezier路径填充500个左右的层，并且我遇到了PERFORMANCE或INTERACTIVITY问题，具体取决于我选择的路径。请注意，我不需要动画功能，因为我绘制的路径是静态的：
如果我使用CALayers，绘制屏幕的路径大约需要15秒（不好），但最终的交互式体验（即在屏幕上移动）非常棒。
如果我使用CAShapeLayers，绘制到屏幕的路径只需要几分之一秒（好），但交互性很差。
这是我的CALayers代码：
func drawPathToCALayer (myView: UIImageView, pointArray: [CGPoint], bbox: CGRect, color: UIColor) {
// step 1. create path
let path = CGPathCreateMutable()
var pathOffset = CGAffineTransformMakeTranslation( (bbox.origin.x * -1), (bbox.origin.y * -1))
CGPathAddLines(path, &pathOffset, pointArray, pointArray.count)
CGPathCloseSubpath(path)
// step 2. draw to context -- this is the part that kills the amount of time that we call this function repeatedly
UIGraphicsBeginImageContextWithOptions(bbox.size, false, 0)
CGContextAddPath(UIGraphicsGetCurrentContext(), path)
CGContextSetFillColorWithColor(UIGraphicsGetCurrentContext(), color.CGColor)
CGContextFillPath(UIGraphicsGetCurrentContext())
// step 3. assign context drawing to sublayer
let sublayer = CALayer()
let strokeImage = UIGraphicsGetImageFromCurrentImageContext()
sublayer.frame = bbox
sublayer.contents = strokeImage.CGImage
UIGraphicsEndImageContext()
myView.layer.addSublayer(sublayer)
这是CAShapeLayers的代码
func drawPathToCAShapeLayer (myView: UIImageView, pointArray: [CGPoint], bbox: CGRect, color: UIColor) {
// step 1. create path
let path = CGPathCreateMutable()
var pathOffset = CGAffineTransformMakeTranslation( (bbox.origin.x * -1), (bbox.origin.y * -1))
CGPathAddLines(path, &pathOffset, pointArray, pointArray.count)
CGPathCloseSubpath(path)
// step 2. assign path to sublayer
let sublayer = CAShapeLayer()
sublayer.path = path
sublayer.fillColor = color
myView.layer.addSublayer(sublayer)
我喜欢CAShapeLayer方法的简洁性和速度，但从交互性的角度来看，这条路线是不行的。
问题是（感谢挂在那里），是否有办法进行混合方法，我暂时将其绘制到CAShapeLayer，并使用它来填充这样的CALayer？
func drawPathToHybrid (myView: UIImageView, pointArray: [CGPoint], bbox: CGRect, color: UIColor) {
// step 1. create path
let path = CGPathCreateMutable()
var pathOffset = CGAffineTransformMakeTranslation( (bbox.origin.x * -1), (bbox.origin.y * -1))
CGPathAddLines(path, &pathOffset, pointArray, pointArray.count)
CGPathCloseSubpath(path)
// step 2. assign path to sublayer
let sublayer = CALayer()
let tmplayer = CAShapeLayer()
tmplayer.path = path
tmplayer.fillColor = color
sublayer.contents = tmplayer.contents // ---> i know this doesn't work, but is there something similar I can take advantage of that doesn't rely on defining a context?
myView.layer.addSublayer(sublayer)
或者更好的是，还有其他一些方法可以填充一系列具有贝塞尔路径的CALayers，以获得良好的交互性和性能吗？