CAShapeLayer决议

Question

请帮助您了解有关图层及其分辨率的问题。在边线的旋转看起来是阶梯式的

之后，我绘制立方体，每个立方体由三个层（背景，边框和字母）组成

screen shot of cubes

let backLayer = CAShapeLayer()
    backLayer.anchorPoint = CGPoint(x: 0.5, y: 0.5)
    backLayer.bounds = backBounds
    backLayer.backgroundColor = color
    backLayer.cornerRadius = cornerRadius
    backLayer.position = position
    backLayer.shadowColor = UIColor.blackColor().CGColor
    backLayer.shadowOffset = CGSize(width: shadowWidth, height: shadowWidth)
    backLayer.shadowOpacity = 0.5
    backLayer.shadowRadius = shadowRadius
    backLayer.contentsScale = UIScreen.mainScreen().scale
    let subPosition = CGPoint(x: backLayer.bounds.height / 2  + dipper, y: backLayer.bounds.height / 2)


    // Border Layer
    let borderLayer = CAShapeLayer()
    borderLayer.bounds = CGRect(x: 0.0  , y: 0.0, width: backLayer.bounds.width - dipper, height: backLayer.bounds.height)
    borderLayer.position = subPosition
    borderLayer.anchorPoint = CGPoint(x: 0.5, y: 0.5)
    borderLayer.cornerRadius = cornerRadius
    borderLayer.borderColor = color
    borderLayer.borderWidth = borderWidth
    borderLayer.shadowColor = UIColor.blackColor().CGColor
    borderLayer.shadowOffset = CGSize(width: 1, height: 1)
    borderLayer.shadowRadius = shadowRadius
    borderLayer.shadowOpacity = 0.6
    borderLayer.contentsScale = UIScreen.mainScreen().scale



    // char layer
    let charLayer = CATextLayer()
    charLayer.bounds = borderLayer.bounds
    charLayer.anchorPoint = CGPoint(x: 0.5, y: 0.5)
    charLayer.position = subPosition
    charLayer.string = NSString(UTF8String: char)
    charLayer.alignmentMode = kCAAlignmentCenter
    charLayer.wrapped = true
    charLayer.shadowColor = UIColor.blackColor().CGColor
    charLayer.shadowOffset = CGSize(width: shadowWidth / 3, height: shadowWidth / 3)
    charLayer.shadowRadius = 2
    charLayer.shadowOpacity = 0.8
    charLayer.truncationMode = kCATruncationMiddle
    charLayer.font = "BookmanOldStyle-Bold"
    charLayer.fontSize = height / 1.4
    charLayer.contentsScale = UIScreen.mainScreen().scale

Answer 1

您可以尝试在图层上启用边缘抗锯齿。像这样：

layer.allowsEdgeAntialiasing = true

如果您想在特定边缘上进行抗锯齿处理（在此示例中仅为左侧和右侧）：

layer.edgeAntialiasingMask = [.LayerLeftEdge, .LayerRightEdge]

最后，值得注意的是，如果您愿意，可以在info.plist中全局设置。

密钥为UIViewEdgeAntialiasing，但要小心，因为the docs＆＃34; 会对性能产生明显影响＆＃34;