问题描述
我要制作一个通用的调谐器应用程序,但是当我尝试绘制模拟仪表时,它会在不同的设备上混乱。也许是非常硬编码的。检查此内容:
I'm about to make a universal Tuner app but when I try to draw an Analog meter it gets messed on different devices. Maybe it's very hardcoded.. Check this:
标签也位于同一UIView下。检查代码以绘制以下路径:
The labels are under the same UIView too. Check the code to draw these paths:
override func draw(_ rect: CGRect) {
let center = CGPoint(x:bounds.width/2, y: bounds.height)
var radius: CGFloat = max(bounds.width, bounds.height+50)
// Define the thickness of the arc.
let arcWidth: CGFloat = 1
let startAngle: CGFloat = π
let endAngle: CGFloat = 2 * π
var path = UIBezierPath(arcCenter: center,
radius: radius/2 - arcWidth/2,
startAngle: startAngle,
endAngle: endAngle,
clockwise: true)
path.lineWidth = arcWidth
counterColor.setStroke()
path.stroke()
radius = max(bounds.width, bounds.height+70)
path = UIBezierPath(arcCenter: center,
radius: radius/2 - arcWidth/2,
startAngle: startAngle,
endAngle: endAngle,
clockwise: true)
let strokeColor = UIColor.black.cgColor
roundThinLayer.path = path.cgPath
roundThinLayer.strokeColor = strokeColor
roundThinLayer.lineWidth = 16.0
roundThinLayer.fillColor = UIColor.clear.cgColor
roundThinLayer.lineDashPattern = [ 0.5, 4.55 ]
//roundThinLayer.lineDashPhase = 0.25
self.layer.addSublayer(roundThinLayer)
radius = max(bounds.width, bounds.height+90)
path = UIBezierPath(arcCenter: center,
radius: radius/2 - arcWidth/2,
startAngle: startAngle,
endAngle: endAngle,
clockwise: true)
roundThickLayer.path = path.cgPath
roundThickLayer.strokeColor = strokeColor
roundThickLayer.lineWidth = 40
roundThickLayer.fillColor = UIColor.clear.cgColor
roundThickLayer.lineDashPattern = [ 1.5, 140 ]
roundThickLayer.lineDashPhase = 0.25
self.layer.addSublayer(roundThickLayer)
}
有人可以帮助我获得这些值而无需进行硬编码吗?即,我想像情节提要(在iPhone 7上运行)那样使细线/粗线破折号。我想使这个应用程序通用化。
Can someone help me get these values without hardcoding? i.e. I want to make the thins/thicks dashes as in the storyboard (that's running on an iPhone 7). I want to make this app universal.
注意:自动调整大小正确,对吧?
Note: The autoresizing is correctly, right?
预先感谢。
推荐答案
@Denis-是的,我认为您的硬编码值正在伤害您,尤其是对于lineDashPattern。
@Denis - yeah, I think your hard-coded values are hurting you, particularly for the lineDashPattern.
尝试一下。它使用线的长度(arc)和刻度的数量来计算lineDashPattern的间隙(可能需要对边界进行一些调整,诸如此类)。
Give this a try. It uses the length of the line (arc) and the number of ticks to calculate the "gaps" for the lineDashPattern (will likely need some tweaking for bounds and what-not)).
public override func draw(_ rect: CGRect) {
let center = CGPoint(x:bounds.width/2, y: bounds.height)
var radius: CGFloat = max(bounds.width, bounds.height+50)
// Define the thickness of the arc.
let arcWidth: CGFloat = 1
let startAngle: CGFloat = CGFloat(M_PI) // π
let endAngle: CGFloat = CGFloat(2 * M_PI) // π
let counterColor = UIColor.red
var path = UIBezierPath(arcCenter: center,
radius: radius/2 - arcWidth/2,
startAngle: startAngle,
endAngle: endAngle,
clockwise: true)
path.lineWidth = arcWidth
counterColor.setStroke()
path.stroke()
// init vars for later use
var nTicks = 0
var tickWidth = 0.0
var gapWidth = 0.0
radius += 20
path = UIBezierPath(arcCenter: center,
radius: radius/2 - arcWidth/2,
startAngle: startAngle,
endAngle: endAngle,
clockwise: true)
let strokeColor = UIColor.black.cgColor
let roundThinLayer = CAShapeLayer()
// number of short ticks to draw
nTicks = 150
// thickness of short ticks
tickWidth = 0.5
// calculate the gap between ticks
gapWidth = ((M_PI * Double(radius) / 2) - (tickWidth * Double(nTicks))) / Double(nTicks - 1)
roundThinLayer.path = path.cgPath
roundThinLayer.strokeColor = strokeColor
roundThinLayer.lineWidth = 20.0
roundThinLayer.fillColor = UIColor.clear.cgColor
roundThinLayer.lineDashPattern = [ tickWidth as NSNumber, gapWidth as NSNumber ]
roundThinLayer.lineDashPhase = CGFloat(tickWidth / Double(2))
self.layer.addSublayer(roundThinLayer)
radius += 20
path = UIBezierPath(arcCenter: center,
radius: radius/2 - arcWidth/2,
startAngle: startAngle,
endAngle: endAngle,
clockwise: true)
let roundThickLayer = CAShapeLayer()
// number of tall ticks to draw
nTicks = 7
// thickness of tall ticks
tickWidth = 1.5
// calculate the gap between ticks
gapWidth = ((M_PI * Double(radius) / 2) - (tickWidth * Double(nTicks))) / Double(nTicks - 1)
roundThickLayer.path = path.cgPath
roundThickLayer.strokeColor = strokeColor
roundThickLayer.lineWidth = 40
roundThickLayer.fillColor = UIColor.clear.cgColor
roundThickLayer.lineDashPattern = [ tickWidth as NSNumber, gapWidth as NSNumber ]
roundThickLayer.lineDashPhase = CGFloat(tickWidth / Double(2))
self.layer.addSublayer(roundThickLayer)
self.clipsToBounds = true
}
这篇关于如何在Swift上使用UIbezierPath进行通用的圆形绘制(使用lineDashPattern)的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!