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
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