ios 用 UIBezierPath 画一条线
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Draw a line with UIBezierPath
提问by William Falcon
First time using BezierPaths, wondering how this function is actually supposed to be implemented. Currently the bezier path moves within the frame of the image, as opposed to drawing on screen.
第一次使用 BezierPaths，想知道这个函数实际上应该如何实现。当前，贝塞尔路径在图像框架内移动，而不是在屏幕上绘制。
Is there a better way to do it?
有没有更好的方法来做到这一点？
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()
}
回答by William Falcon
Ended up doing it this way:
最终这样做了：
func drawLineFromPoint(start : CGPoint, toPoint end:CGPoint, ofColor lineColor: UIColor, inView view:UIView) {
//design the path
var path = UIBezierPath()
path.moveToPoint(start)
path.addLineToPoint(end)
//design path in layer
var shapeLayer = CAShapeLayer()
shapeLayer.path = path.CGPath
shapeLayer.strokeColor = lineColor.CGColor
shapeLayer.lineWidth = 1.0
view.layer.addSublayer(shapeLayer)
}
回答by RubberDucky4444
Swift 3.1 Version of William Falcon's Answer + Improved
Swift 3.1 版本的 William Falcon's Answer + 改进
This is just an updated version of already accepted answer, and I just added a little bit more to it.
这只是已经接受的答案的更新版本，我只是添加了一点。
func drawLineFromPointToPoint(startX: Int, toEndingX endX: Int, startingY startY: Int, toEndingY endY: Int, ofColor lineColor: UIColor, widthOfLine lineWidth: CGFloat, inView view: UIView) {
let path = UIBezierPath()
path.move(to: CGPoint(x: startX, y: startY))
path.addLine(to: CGPoint(x: endX, y: endY))
let shapeLayer = CAShapeLayer()
shapeLayer.path = path.cgPath
shapeLayer.strokeColor = lineColor.cgColor
shapeLayer.lineWidth = lineWidth
view.layer.addSublayer(shapeLayer)
}
And of course the implementation would be
当然，实施将是
drawLineFromPointToPoint(startX: Int, toEndingX: Int, startingY: Int, toEndingY: Int, ofColor: UIColor, widthOfLine: CGFloat, inView: UIView)
What I changed from accepted answer
我从接受的答案中改变了什么
I changed the vars to lets, and made it easier to input the start and end of both the x and the y. I also allow the user to change the width of the line.
我将 vars 更改为 let，并且更容易输入 x 和 y 的开始和结束。我还允许用户更改线条的宽度。
I chose for the values to be of type Int, but you can change those to be the other allowed options.
我选择了 Int 类型的值，但您可以将它们更改为其他允许的选项。
回答by Neha
Swift 4
斯威夫特 4
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)
}
回答by Zhanserik
To draw horizontal line on top:
在顶部绘制水平线：
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)
To draw horizontal line on bottom:
在底部绘制水平线：
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)
