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假设一个 CALayer 会生成一些子 layers ，重置的时候，各位是用removeFromSuperlayer，还是直接sublayers = []?
class Mycalayer: CALayer {
func update () {
// insert some Sublayers here
.....
}
func refresh () {
// reset all sublayers
self.sublayers?.forEach { layer in
layer.removeFromSuperlayer()
}
// OR Just
self.sublayers = []
}
}
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