与CALayer的
问题描述:
一些视觉上的错误我有以下细胞UITableView的布局:与CALayer的
•UIView的
••的UIImageView
•••半透明叠加的UIView为的UIImageView子视图
也有模仿“播放”按钮和UILabel的图标视图,但它们似乎与此错误无关。
而且我有以下代码:
override func layoutSubviews() {
super.layoutSubviews()
createPath()
}
private func createPath() {
let padding = CGFloat(16)
let bottomLineLength = CGFloat(64)
let arcPadding = CGFloat(8)
let width = self.contentView.frame.width
let height = self.contentView.frame.height
if pathLayer != nil {
pathLayer?.removeFromSuperlayer()
}
pathLayer = CAShapeLayer()
let path = UIBezierPath()
path.move(to: CGPoint(x: padding + arcPadding, y: padding))
path.addLine(to: CGPoint(x: width - padding - arcPadding, y: padding))
// Top-Right arc
path.addArc(withCenter: CGPoint(x: width - padding - arcPadding, y: padding + arcPadding),
radius: arcPadding,
startAngle: CGFloat(3 * M_PI/2),
endAngle: CGFloat(M_PI * 2),
clockwise: true)
path.move(to: CGPoint(x: width - padding, y: padding + arcPadding))
path.addLine(to: CGPoint(x: width - padding, y: height - padding - arcPadding))
// Bottom-Right arc
path.addArc(withCenter: CGPoint(x: width - padding - arcPadding, y: height - padding - arcPadding),
radius: arcPadding,
startAngle: CGFloat(M_PI * 2),
endAngle: CGFloat(M_PI/2),
clockwise: true)
path.move(to: CGPoint(x: width - padding - arcPadding, y: height - padding))
path.addLine(to: CGPoint(x: width - padding - bottomLineLength, y: height - padding))
path.move(to: CGPoint(x: padding + bottomLineLength, y: height - padding))
path.addLine(to: CGPoint(x: padding + arcPadding, y: height - padding))
// Bottom-Left arc
path.addArc(withCenter: CGPoint(x: padding + arcPadding, y: height - padding - arcPadding),
radius: arcPadding,
startAngle: CGFloat(M_PI/2),
endAngle: CGFloat(M_PI),
clockwise: true)
path.move(to: CGPoint(x: padding, y: height - padding - arcPadding))
path.addLine(to: CGPoint(x: padding, y: padding + arcPadding))
// Top-Left arc
path.addArc(withCenter: CGPoint(x: padding + arcPadding, y: padding + arcPadding),
radius: arcPadding,
startAngle: CGFloat(M_PI),
endAngle: CGFloat(3 * M_PI/2),
clockwise: true)
pathLayer?.rasterizationScale = 2 * UIScreen.main.scale
pathLayer?.shouldRasterize = true
pathLayer?.strokeColor = UIColor(red: 0xFF/255, green: 0xFF/255, blue: 0xFF/255, alpha: 0.5).cgColor
pathLayer?.lineWidth = 2.0
pathLayer?.path = path.cgPath
contentView.layer.addSublayer(pathLayer!)
}
我称它在layoutSubviews对于重新创建的设备旋转的路径。
如果你看截图,会看到一些黑色,并在路径附近旋转了一些黑色的“洞”。它们全都看起来一样,并且它们当然不在UIImageView中的图像上。
我认为这是关系到我的CALayer。如何解决它?
答
你的问题是这些黑楔子:
的根本原因是,CAShapeLayer
的默认fillColor
是不透明的黑色。将其设为零,以避免填充:
pathLayer?.fillColor = nil
做完这些,让我告诉你一个较短的方式来构建你的路径:
let cgPath = CGMutablePath()
let start = CGPoint(x: padding + bottomLineLength, y: height - padding)
let blCorner = CGPoint(x: padding, y: height - padding)
let tlCorner = CGPoint(x: padding, y: padding)
let trCorner = CGPoint(x: width - padding, y: padding)
let brCorner = CGPoint(x: width - padding, y: height - padding)
let end = CGPoint(x: width - padding - bottomLineLength, y: height - padding)
cgPath.move(to: start)
cgPath.addArc(tangent1End: blCorner, tangent2End: tlCorner, radius: arcPadding)
cgPath.addArc(tangent1End: tlCorner, tangent2End: trCorner, radius: arcPadding)
cgPath.addArc(tangent1End: trCorner, tangent2End: brCorner, radius: arcPadding)
cgPath.addArc(tangent1End: brCorner, tangent2End: end, radius: arcPadding)
cgPath.addLine(to: end)
shapeLayer.path = cgPath
结果:
有一个沿着每个圆角矩形的内部左边缘的黑色楔子。如果您放大,则可以看到。沿着顶部,右侧和左下边缘也有楔形。 –
@robmayoff我很高兴你看到他的意思! – matt