第一次使用BezierPaths时,我想知道这个函数实际上是如何实现的。当前,bezier路径在图像的框架内移动,而不是在屏幕上绘制。
有没有更好的方法呢?
func drawLineFromPoint(start : CGPoint, toPoint end:CGPoint, ofColor lineColor: UIColor, inView view:UIView) {
var maxWidth = abs(start.x - end.x)
var maxHeight = abs(start.y - end.y)
var contextSize : CGSize!
if maxWidth == 0 {
contextSize = CGSize(width: 1, height: maxHeight)
}else {
contextSize = CGSize(width: maxWidth, height: 1)
}
//design the path
UIGraphicsBeginImageContextWithOptions(contextSize, false, 0)
var path = UIBezierPath()
path.lineWidth = 1.0
lineColor.set()
//draw the path and make visible
path.moveToPoint(start)
path.addLineToPoint(end)
path.stroke()
//create image from path and add to subview
var image = UIGraphicsGetImageFromCurrentImageContext()
var imageView = UIImageView(image: image)
view.addSubview(imageView)
UIGraphicsEndImageContext()
}
发布于 2014-10-31 04:54:12
最终是这样做的:
func drawLineFromPoint(start : CGPoint, toPoint end:CGPoint, ofColor lineColor: UIColor, inView view:UIView) {
//design the path
let path = UIBezierPath()
path.move(to: start)
path.addLine(to: end)
//design path in layer
let shapeLayer = CAShapeLayer()
shapeLayer.path = path.cgPath
shapeLayer.strokeColor = lineColor.CGColor
shapeLayer.lineWidth = 1.0
view.layer.addSublayer(shapeLayer)
}
发布于 2017-08-12 13:57:12
要在顶部绘制水平线,请执行以下操作:
let path = UIBezierPath()
path.moveToPoint(CGPoint(x: 0, y: 0))
path.addLineToPoint(CGPoint(x: yourView.frame.width, y: 0))
let shapeLayer = CAShapeLayer()
shapeLayer.path = path.CGPath
shapeLayer.strokeColor = UIColor.lightGrayColor().CGColor
shapeLayer.lineWidth = 0.5
yourView.layer.addSublayer(shapeLayer)
要在底部绘制水平线,请执行以下操作:
let path = UIBezierPath()
path.moveToPoint(CGPoint(x: 0, y: yourView.frame.height))
path.addLineToPoint(CGPoint(x: yourView.frame.width, y: yourView.frame.height))
let shapeLayer = CAShapeLayer()
shapeLayer.path = path.CGPath
shapeLayer.strokeColor = UIColor.lightGrayColor().CGColor
shapeLayer.lineWidth = 0.5
yourView.layer.addSublayer(shapeLayer)
https://stackoverflow.com/questions/26662415
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