新建一个继承自uiview的类 FCCycleView是我的类名 oc的UIview swift不写init方法会报错 写了又多此一举 还不能写不带参数的 init函数 但是可以写便利构造函数（but 会crash） 所以就参数问题写成了属性 参考了其他的文章 几乎都是写成带frame的函数 （有大神知道的话 忘告知 谢谢！！！）
import UIKit
class FCCycleView:UIView{
varprogressWidth :CGFloat=10//线宽
varbottomColor :UIColor?//底线
vartopColor :UIColor?//progress线条
var origin :CGPoint=CGPoint(x:0, y:0)//圆点
var radius :CGFloat=0//半径
var startAngle :CGFloat=0//起始
var endAngle :CGFloat=0//结束
var blocks : ((_progressfloat:CGFloat)->())?//回调进度比例的
//进度label
private lazy var progressLabel :UILabel= {
let lab =UILabel()
lab.frame=CGRect(x:0, y:0, width:100, height:15)
lab.center = CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2)
lab.textColor = UIColor.red
lab.font=UIFont.systemFont(ofSize:13)
lab.textAlignment= .center
returnlab
}()
privatelazyvarbottomLayer :CAShapeLayer= {
letlayers =CAShapeLayer()
layers.fillColor=UIColor.clear.cgColor
returnlayers
}()
privatelazyvartopLayer :CAShapeLayer= {
letlayers =CAShapeLayer()
layers.lineCap=kCALineCapRound
layers.fillColor=UIColor.clear.cgColor
returnlayers
}()
overridefuncdraw(_rect:CGRect) {
setUPUI()
addRound()
setMethoud()
blocks= {(profloat:CGFloat)->()in
self.progressLabel.text="\(Int(profloat *100))"+"%"
self.startAngle= -CGFloat(Double.pi/2)
self.endAngle=self.startAngle+ profloat *CGFloat(Double.pi*2)
lettopPath =UIBezierPath.init(arcCenter:self.origin, radius:self.radius, startAngle:self.startAngle, endAngle:self.endAngle, clockwise:true)
self.topLayer.path=topPath.cgPath//添加路径
//添加动画
letpathAnimation =CABasicAnimation.init(keyPath:"strokeEnd")
pathAnimation.duration=1//动画持续时间
pathAnimation.timingFunction = CAMediaTimingFunction.init(name: kCAMediaTimingFunctionEaseOut)
pathAnimation.fromValue=0
pathAnimation.toValue=1
self.topLayer.add(pathAnimation, forKey:"strokeEndAnimation")
}
}
overrideinit(frame:CGRect) {
super.init(frame: frame)
self.backgroundColor=UIColor.white
}
requiredinit?(coder aDecoder:NSCoder) {
fatalError("init(coder:) has not been implemented")
}
funcsetUPUI() {
layer.addSublayer(bottomLayer)
layer.addSublayer(topLayer)
addSubview(progressLabel)
}
funcaddRound() {
origin = CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2)
radius = self.bounds.size.width/2
letbottomPath =UIBezierPath.init(arcCenter:origin, radius:radius, startAngle:0, endAngle:CGFloat(Double.pi*2), clockwise:true)
bottomLayer.path=bottomPath.cgPath
}
funcsetMethoud() {
bottomLayer.strokeColor = bottomColor?.cgColor
topLayer.strokeColor = topColor?.cgColor
topLayer.lineWidth = progressWidth
bottomLayer.lineWidth=progressWidth
}
}
VC调用方法
我用的snapit 约束 （可以打开下面注释）
import UIKit
classTargetCycleVC:UIViewController{
// 画圆
privatelazyvarcircleProgress :FCCycleView= {
letcycle =FCCycleView()
cycle.frame=CGRect(x:100, y:100, width:200, height:200)
cycle.topColor=UIColor.purple
cycle.bottomColor=UIColor.cyan
cycle.progressWidth=10
returncycle
}()
overridefuncviewDidLoad() {
super.viewDidLoad()
view.backgroundColor=UIColor.white
setUPUI()
// addLayOuts()
}
overridefunctouchesBegan(_touches:Set, with event:UIEvent?) {
// 回调圆的比例 值为0-1
if self.circleProgress.blocks != nil{
self.circleProgress.blocks!(0.88)
}
}
privatefuncsetUPUI() {
view.addSubview(circleProgress)
}
// private func addLayOuts() {
// circleProgress.snp.makeConstraints { (make) in
// make.top.equalTo(view.snp.top).offset(50)
// make.centerX.equalTo(view.snp.centerX)
// make.size.equalTo(CGSize(width: 200, height:200))
// }
// }
}
源码地址 麻烦给个star: https://github.com/fc931127/cycle.git