swift 绘制下载进度
发布时间:2020-12-14 06:47:45 所属栏目:百科 来源:网络整理
导读:class ProgressView: UIView { // MARK:- 定义属性 var progress : CGFloat = 0 { didSet { setNeedsDisplay() } } // MARK:- 重写drawRect方法 override func drawRect(rect: CGRect) { super.drawRect(rect) // 获取参数 let center = CGPoint(x: rect.wid
class ProgressView: UIView { // MARK:- 定义属性 var progress : CGFloat = 0 { didSet { setNeedsDisplay() } } // MARK:- 重写drawRect方法 override func drawRect(rect: CGRect) { super.drawRect(rect) // 获取参数 let center = CGPoint(x: rect.width * 0.5,y: rect.height * 0.5) let radius = rect.width * 0.5 - 3 let startAngle = CGFloat(-M_PI_2) let endAngle = CGFloat(2 * M_PI) * progress + startAngle // 创建贝塞尔曲线 let path = UIBezierPath(arcCenter: center,radius: radius,startAngle: startAngle,endAngle: endAngle,clockwise: true) // 绘制一条中心点的线 path.addLineToPoint(center) path.closePath() // 设置绘制的颜色 UIColor(white: 1.0,alpha: 0.4).setFill() // 开始绘制 path.fill() } } progressView.bounds = CGRect(x: 0,y: 0,width: 50,height: 50) progressView.center = CGPoint(x: UIScreen.mainScreen().bounds.width * 0.5,y: UIScreen.mainScreen().bounds.height * 0.5) // 3.设置控件的属性 progressView.hidden = true progressView.backgroundColor = UIColor.clearColor() // 4.设置imagView的图片 progressView.hidden = false imageView.sd_setImageWithURL(getBigURL(picURL),placeholderImage: image,options: [],progress: { (current,total) -> Void in self.progressView.progress = CGFloat(current) / CGFloat(total) }) { (_,_,_) -> Void in self.progressView.hidden = true } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |