RefreshView.swift: 用了Then协议库
import UIKit
class RefreshView: UIView {
let circleLayer =CAShapeLayer()
let indicatorView =UIActivityIndicatorView().then {
$0.frame = CGRect(x:0, y: 0, width:16, height: 16)
}
fileprivatevar refreshing = false
fileprivatevar endRef = false
overrideinit(frame: CGRect) {
super.init(frame: frame)
creatCircleLayer()
}
overridefunc layoutSubviews() {
super.layoutSubviews()
circleLayer.position =CGPoint(x: frame.width/2, y: frame.height/2)
indicatorView.center = CGPoint(x: frame.width/2, y: frame.height/2)
}
func creatCircleLayer() {
circleLayer.path =UIBezierPath(arcCenter: CGPoint(x: 8, y:8),
radius: 8,
startAngle: CGFloat(M_PI_2),
endAngle: CGFloat(M_PI_2 +2*M_PI),
clockwise: true).cgPath
circleLayer.strokeColor =UIColor.white.cgColor
circleLayer.fillColor =UIColor.clear.cgColor
circleLayer.strokeStart =0.0
circleLayer.strokeEnd =0.0
circleLayer.lineWidth =1.0
circleLayer.lineCap =kCALineCapRound
circleLayer.bounds =CGRect(x: 0, y:0, width: 16, height:16)
circleLayer.anchorPoint =CGPoint(x: 0.5, y:0.5)
layer.addSublayer(circleLayer)
}
requiredinit?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
extension RefreshView {
//向下拖拽视图准备刷新的过程会响应
func pullToRefresh(progress:CGFloat) {
circleLayer.strokeEnd = progress
}
//开始刷新
func beginRefresh(begin:@escaping () -> Void) {
ifrefreshing {
//防止刷新未结束又开始请求刷新
return
}
refreshing =true
circleLayer.removeFromSuperlayer()
addSubview(indicatorView)
indicatorView.startAnimating()
begin()
}
//结束刷新
func endRefresh() {
refreshing =false
indicatorView.stopAnimating()
indicatorView.removeFromSuperview()
}
//重制刷新控件
func resetLayer() {
DispatchQueue.main.asyncAfter(deadline:DispatchTime.now() +0.5) {
self.creatCircleLayer()
}
}
}