iOS MJRefres自定义下拉控件

//

//  PullDownRefreshHeader.swift

//  greeMall

//

//  Created by fuzhongw on 2021/11/13.

//  Copyright © 2021 com.gree. All rights reserved.

//

importUIKit

importRxSwift

importRxCocoa

class PullDownRefreshHeader: MJRefreshHeader {

    // 转圈的菊花

    varstateLabel:UILabel= {

        letlabel =UILabel()

        label.textColor= .x999999

        label.font= .pingFangMedium(size:12)

        returnlabel

    }()

    // 下拉的icon

    vararrowImage:UIImageView= {

        letimageView =UIImageView()

        imageView.image=UIImage(named:"icon_pull_down")

        returnimageView

    }()

    // 下拉的icon

    varcontentView:UIView= {

        letv =UIView()

        returnv

    }()

    // 处理不同刷新状态下的组件状态

    overridevarstate: MJRefreshState {

        didSet{

            switchstate{

            case.idle:

                self.stateLabel.text="松开刷新"

                self.stopArrowView()

            case.pulling:

                self.startArrowView()

                self.stateLabel.text="松开刷新"

            case.refreshing:

                self.stateLabel.text="刷新中"

            default:

                print("")

            }

        }

    }

    override func prepare() {

        super.prepare()

        self.addSubview(self.contentView)

        self.contentView.addSubview(self.stateLabel)

        self.contentView.addSubview(self.arrowImage)

        self.arrowImage.frame=CGRect(x:0,y:0,width:20,height:20)

        self.arrowImage.snp.makeConstraints { makein

            make.left.equalToSuperview()

            make.top.equalToSuperview()

            make.bottom.equalToSuperview()

        }

        self.stateLabel.snp.makeConstraints { makein

            make.right.equalToSuperview()

            make.left.equalTo(self.arrowImage.snp_right).offset(10)

            make.centerY.equalToSuperview()

        }

        self.contentView.snp.makeConstraints { makein

            make.center.equalToSuperview()

        }

    }

    // 组件定位

    override func placeSubviews() {

        super.placeSubviews()

    }

    private func stopArrowView() {

        print("----22222222222--结束")

        self.arrowImage.layer.removeAllAnimations()

    }

    private func startArrowView() {

        print("----22222222222--开始")

        rotateView()

    }

   private func rotateView() {

        self.arrowImage.layer.removeAllAnimations()

       let animation: CABasicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")

       animation.isRemovedOnCompletion = false

       animation.fillMode=CAMediaTimingFillMode.forwards

       animation.fromValue=0

       animation.toValue= (Double.pi*2)

       animation.duration=1.0

       animation.repeatCount=Float(INT_MAX)

       self.arrowImage.layer.add(animation, forKåey:"rotate")

    }

}