iOS 渐变进度条

Posted 2022-11-22 博BOBO

直接上代码

import UIKit

class ViewController: UIViewController 

    lazy var colorImage: myVIew = 
            let imageView = myVIew(image: UIImage.init(named: "aaaa"))
            imageView.frame = CGRect(x: 100, y: 100, width: 100, height: 100)
            return imageView
    ()
    
    var percent :CGFloat = 0.7

    
    override func viewDidLoad() 
        super.viewDidLoad()
        
    
//        let myView = myVIew.init(frame: CGRect(x: 100, y: 100, width: 100, height: 100));
//
//        myView.backgroundColor = .yellow
        
        self.view.addSubview(colorImage)
        
        self.setRect(CGRect(x: 100, y: 100, width: 100, height: 100))
        // Do any additional setup after loading the view.
    

    
    
    func setRect(_ rect: CGRect) 
           let path = UIBezierPath.init(arcCenter:CGPoint(x: colorImage.bounds.size.width * 0.5, y: colorImage.bounds.size.height * 0.5), radius: colorImage.bounds.size.width * 0.5 - 5, startAngle: CGFloat.pi * 0.8, endAngle: CGFloat.pi * 2.5, clockwise: true)

     
           let shapeLayer = CAShapeLayer()
           shapeLayer.bounds = colorImage.bounds
           shapeLayer.lineCap = CAShapeLayerLineCap.round
           shapeLayer.position = CGPoint(x: colorImage.bounds.size.width * 0.5, y: colorImage.bounds.size.height * 0.5)
          
           shapeLayer.path = path.cgPath
           shapeLayer.fillColor = UIColor.clear.cgColor
           shapeLayer.strokeColor = UIColor.white.cgColor
           shapeLayer.lineWidth = 6.0
        colorImage.layer.mask = shapeLayer//关键步骤
           
           /**
           设置进度条动画
           */
           let ani = CABasicAnimation(keyPath: "strokeEnd")
           ani.duration = 2
           ani.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeOut)
           ani.fromValue = 0
           ani.toValue = self.percent ?? 0
           ani.fillMode = CAMediaTimingFillMode.forwards
           ani.isRemovedOnCompletion = false
           shapeLayer.add(ani, forKey: nil)
       
    




class myVIew : UIImageView 
   

看效果