Ios 用swift制作多色条
我试着画一条线（基本上是UIView），它有固定的高度和宽度，被分成九段。我希望能够控制每个片段的高度及其颜色。例如，我希望第一段为黄色，占线路总高度的30%，第二段为红色，占线路总高度的8%，等等 我不太擅长Swift，所以我的解决方案是制作9个UIView，将它们堆叠在我的故事板上，然后手动设置每个视图的高度和背景色，使它们看起来像一条多色线。是否有更干净、体积更小的解决方案？谢谢我强烈建议您为此使用核心图形。 由于绘图非常简单（您只想在视图中堆叠一些彩色线条），您可以通过子类化Ios 用swift制作多色条,ios,swift,Ios,Swift,我试着画一条线（基本上是UIView），它有固定的高度和宽度，被分成九段。我希望能够控制每个片段的高度及其颜色。例如，我希望第一段为黄色，占线路总高度的30%，第二段为红色，占线路总高度的8%，等等 我不太擅长Swift，所以我的解决方案是制作9个UIView，将它们堆叠在我的故事板上，然后手动设置每个视图的高度和背景色，使它们看起来像一条多色线。是否有更干净、体积更小的解决方案？谢谢我强烈建议您为此使用核心图形。 由于绘图非常简单（您只想在视图中堆叠一些彩色线条），您可以通过子类化UIView
UIViewdrawRect（）class LineView : UIView {
let colors:[UIColor] = [UIColor.redColor(), UIColor.blueColor(), UIColor.greenColor()]
let values:[CGFloat] = [0.35, 0.45, 0.2]
override func drawRect(rect: CGRect) {
let r = self.bounds // the view's bounds
let numberOfSegments = values.count // number of segments to render
let ctx = UIGraphicsGetCurrentContext() // get the current context
var cumulativeValue:CGFloat = 0 // store a cumulative value in order to start each line after the last one
for i in 0..<numberOfSegments {
CGContextSetFillColorWithColor(ctx, colors[i]) // set fill color to the given color
CGContextFillRect(ctx, CGRectMake(0, cumulativeValue*r.size.height, r.size.width, values[i]*r.size.height)) // fill that given segment
cumulativeValue += values[i] // increment cumulative value
}
}
}
class LineView : UIView {
/// An array of optional UIColors (clearColor is used when nil is provided) defining the color of each segment.
var colors : [UIColor?] = [UIColor?]() {
didSet {
self.setNeedsDisplay()
}
}
/// An array of CGFloat values to define how much of the view each segment occupies. Should add up to 1.0.
var values : [CGFloat] = [CGFloat]() {
didSet {
self.setNeedsDisplay()
}
}
override init(frame: CGRect) {
super.init(frame: frame)
backgroundColor = UIColor.clearColor()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
override func drawRect(rect: CGRect) {
let r = self.bounds // the view's bounds
let numberOfSegments = values.count // number of segments to render
let ctx = UIGraphicsGetCurrentContext() // get the current context
var cumulativeValue:CGFloat = 0 // store a cumulative value in order to start each line after the last one
for i in 0..<numberOfSegments {
CGContextSetFillColorWithColor(ctx, colors[i]?.CGColor ?? UIColor.clearColor().CGColor) // set fill color to the given color if it's provided, else use clearColor
CGContextFillRect(ctx, CGRectMake(0, cumulativeValue*r.size.height, r.size.width, values[i]*r.size.height)) // fill that given segment
cumulativeValue += values[i] // increment cumulative value
}
}
}
let lineView = LineView(frame: CGRectMake(50, 50, 20, view.bounds.size.height-100))
lineView.colors = [
UIColor(red: 1.0, green: 31.0/255.0, blue: 73.0/255.0, alpha: 1.0), // red
UIColor(red:1.0, green: 138.0/255.0, blue: 0.0, alpha:1.0), // orange
UIColor(red: 122.0/255.0, green: 108.0/255.0, blue: 1.0, alpha: 1.0), // purple
UIColor(red: 0.0, green: 100.0/255.0, blue: 1.0, alpha: 1.0), // dark blue
UIColor(red: 100.0/255.0, green: 241.0/255.0, blue: 183.0/255.0, alpha: 1.0), // green
UIColor(red: 0.0, green: 222.0/255.0, blue: 1.0, alpha: 1.0) // blue
]
lineView.values = [0.15, 0.1, 0.35, 0.15, 0.1, 0.15]
view.addSubview(lineView);
class LineView : UIView {
let colors:[UIColor] = [UIColor.redColor(), UIColor.blueColor(), UIColor.greenColor()]
let values:[CGFloat] = [0.35, 0.45, 0.2]
override func drawRect(rect: CGRect) {
let r = self.bounds // the view's bounds
let numberOfSegments = values.count // number of segments to render
let ctx = UIGraphicsGetCurrentContext() // get the current context
var cumulativeValue:CGFloat = 0 // store a cumulative value in order to start each line after the last one
for i in 0..<numberOfSegments {
CGContextSetFillColorWithColor(ctx, colors[i]) // set fill color to the given color
CGContextFillRect(ctx, CGRectMake(0, cumulativeValue*r.size.height, r.size.width, values[i]*r.size.height)) // fill that given segment
cumulativeValue += values[i] // increment cumulative value
}
}
}
class LineView : UIView {
/// An array of optional UIColors (clearColor is used when nil is provided) defining the color of each segment.
var colors : [UIColor?] = [UIColor?]() {
didSet {
self.setNeedsDisplay()
}
}
/// An array of CGFloat values to define how much of the view each segment occupies. Should add up to 1.0.
var values : [CGFloat] = [CGFloat]() {
didSet {
self.setNeedsDisplay()
}
}
override init(frame: CGRect) {
super.init(frame: frame)
backgroundColor = UIColor.clearColor()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
override func drawRect(rect: CGRect) {
let r = self.bounds // the view's bounds
let numberOfSegments = values.count // number of segments to render
let ctx = UIGraphicsGetCurrentContext() // get the current context
var cumulativeValue:CGFloat = 0 // store a cumulative value in order to start each line after the last one
for i in 0..<numberOfSegments {
CGContextSetFillColorWithColor(ctx, colors[i]?.CGColor ?? UIColor.clearColor().CGColor) // set fill color to the given color if it's provided, else use clearColor
CGContextFillRect(ctx, CGRectMake(0, cumulativeValue*r.size.height, r.size.width, values[i]*r.size.height)) // fill that given segment
cumulativeValue += values[i] // increment cumulative value
}
}
}
let lineView = LineView(frame: CGRectMake(50, 50, 20, view.bounds.size.height-100))
lineView.colors = [
UIColor(red: 1.0, green: 31.0/255.0, blue: 73.0/255.0, alpha: 1.0), // red
UIColor(red:1.0, green: 138.0/255.0, blue: 0.0, alpha:1.0), // orange
UIColor(red: 122.0/255.0, green: 108.0/255.0, blue: 1.0, alpha: 1.0), // purple
UIColor(red: 0.0, green: 100.0/255.0, blue: 1.0, alpha: 1.0), // dark blue
UIColor(red: 100.0/255.0, green: 241.0/255.0, blue: 183.0/255.0, alpha: 1.0), // green
UIColor(red: 0.0, green: 222.0/255.0, blue: 1.0, alpha: 1.0) // blue
]
lineView.values = [0.15, 0.1, 0.35, 0.15, 0.1, 0.15]
view.addSubview(lineView);
完整项目：我刚刚意识到这不是您需要的。 不管怎样，我留下了答案，以便将来可能对其他人有所帮助 确保您的线视图有自己的UIView子类，这样我们就可以覆盖
drawRectclass BarLine: UIView {
override func drawRect(rect: CGRect) {
//Height of each segment, in percentage
var heights : [CGFloat] = [0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9]
//Lets create 9 rects and set each rect width to be 1/9th of the view size, then add them to the array
let width : CGFloat = rect.size.width / 9.0
var i : Int = Int()
//Loop to generate 9 segmnets
for (i = 0; i < 9; i++) {
//Each rect origin must be translated by i * width
let origin = CGPointMake(CGFloat(i) * width, rect.height)
//Generate a random color
let color = UIColor(red: heights[i], green: 0.5, blue: 0.5, alpha: 1)
let segment = CGRect(x: origin.x, y: origin.y, width: width, height: -heights[i] * rect.height)
//Set the color
color.set()
//Add the segment to the view by drawing it
UIRectFill(segment)
}
}
}
class条线：UIView{
重写func drawRect（rect:CGRect）{
//每段的高度，以百分比表示
变量高度：[CGFloat]=[0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9]
//让我们创建9个矩形，并将每个矩形宽度设置为视图大小的1/9，然后将它们添加到数组中
let width:CGFloat=rect.size.width/9.0
变量i:Int=Int（）
//循环以生成9个segmnet
对于（i=0；i<9；i++）{
//每个rect原点必须转换为i*宽度
让原点=CGPointMake（CGFloat（i）*宽度，矩形高度）
//生成随机颜色
让颜色=UIColor（红色：高度[i]，绿色：0.5，蓝色：0.5，alpha:1）
设线段=CGRect（x:origin.x，y:origin.y，width:width，height:-heights[i]*rect.height）
//设置颜色
color.set（）
//通过绘制线段将其添加到视图中
UIRectFill（段）
}
}
}
导入UIKit
公共类ColorLineView:UIView{
公共变量颜色：[UIColor？]=[UIColor？]（）{
迪塞特{
self.setNeedsDisplay（）
}
}
公共变量值：[CGFloat]=[CGFloat]（）{
迪塞特{
self.setNeedsDisplay（）
}
}
公共重写初始化（帧：CGRect）{
super.init（frame:frame）
背景颜色=.clear
}
必需的初始化？（编码器aDecoder:NSCoder）{
super.init（编码者：aDecoder）
}
公共覆盖函数绘图（rect:CGRect）{
设r=自界
让numberOfSegments=values.count
guard let ctx=UIGraphicsGetCurrentContext（）else{return}
var累积值：CGFloat=0
我在0 ..解决方案听起来不错，但考虑比例约束，你只是做简单的绘图在这里（只是多个颜色堆叠在对方），我将研究重写drawRect
并在核心图形中绘制线条。这肯定是一个比创建9个单独的子视图更干净的解决方案。@originaluser2是的，就是这个。可以对您的解决方案进行一点扩展吗？为了补充@originaluser2所说的内容，这里有一个关于核心图形的教程@EmilioPelaez，谢谢，我们将对此进行研究。@sh4rPEYE很乐意提供帮助！我们如何才能为此创建多行代码？这仍然是一个令人钦佩的答案，即使这不是OP想要的；）