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[英]CAGradientLayer issues for animated circle created using CAShapeLayer
[英]Improve Performance of Gradient Border using CAShapeLayer and CAGradientLayer
我正在使用此方法將漸變邊框應用於視圖。 但是,當視圖位於表格視圖的單元格中時,表格視圖的滾動幀速率會顯着下降。 有沒有辦法提高性能? 我嘗試將opaque,drawsAsynchronously設置為true,並且應該按照Apple的建議將true正確設置為true,但沒有任何更改。
func addBorder(colors:[UIColor]? = nil,size:CGSize? = nil) {
_ = self.sublayers?.filter({$0.name == "GradientBorder"}).map({$0.removeFromSuperlayer()})
let shapeFrame = CGRect(origin: CGPointZero, size: size ?? bounds.size)
let gradientLayer = CAGradientLayer()
gradientLayer.name = "GradientBorder"
gradientLayer.frame = shapeFrame
gradientLayer.startPoint = CGPointMake(0.0, 0.5)
gradientLayer.endPoint = CGPointMake(1.0, 0.5)
gradientLayer.colors = colors == nil ? [UIColor.blueColor().CGColor,UIColor.redColor().CGColor] : colors!.map({$0.CGColor})
gradientLayer.contentsScale = UIScreen.mainScreen().scale
let shapeLayer = CAShapeLayer()
shapeLayer.lineWidth = 2
shapeLayer.path = UIBezierPath(roundedRect: shapeFrame, cornerRadius: self.cornerRadius).CGPath
shapeLayer.fillColor = nil
shapeLayer.strokeColor = UIColor.blackColor().CGColor
gradientLayer.shouldRasterize = true
gradientLayer.opaque = true
gradientLayer.drawsAsynchronously = true
shapeLayer.drawsAsynchronously = true
shapeLayer.opaque = true
gradientLayer.mask = shapeLayer
self.addSublayer(gradientLayer)
}
好的,我找到了解決方案,這非常容易。 我只是添加了這三行。
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
self.layer.shouldRasterize = true
self.opaque = true
self.layer.rasterizationScale = UIScreen.mainScreen().scale
}
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