【iOS】Runloop优化列表滑动卡顿

此图是我卡顿的列表页截屏，为了避免打广告和泄漏隐私的缘故，部分地方会打马赛克，望谅解，不过绝对不影响读者阅读：

// // JCWFinancialFroductListVC.swift // HengYouCai // // Created by wll on 2017/11/9. // Copyright © 2017年 wll. All rights reserved. // 理财产品列表--代码

import UIKit

///定义blcok typealias RunloopBlock = ((IndexPath) -> Bool) private let cellID = "XXXFinancialFroductListVCCell"

//MARK:界面初始化 class XXXFinancialFroductListVC: BaseTableViewController {

//iOS11 系统bug会特别卡 ///时钟事件 var timer: Timer? ///任务数组 var tasksArr: [RunloopBlock] = [] ///任务对应indexPath数组 var tasksIndexPathArr: [IndexPath] = [] ///最大任务 10 let maxQueueLength = XXXLimitNumberPageSize

///上拉下拉刷新管理器 let pageManager = XXXRefreshPageManager() override func viewWillAppear(_ animated: Bool) { super.viewWillAppear(animated) //每次进来刷新 if pageManager.pageNo>1 {

let index = IndexPath(row: 0, section: 0) self.tableView.scrollToRow(at: index, at: .top, animated: true) } pageManager.pageNo = 1

loadData()

} override func viewDidLoad() { super.viewDidLoad() self.view.jcw_showGifLoading() ///界面配置 self.createNav() self.createCV()

//添加runloop的监听 self.addRunloopObserver()

weak var weakSelf = self self.tableView.mj_header = WLRefreshGifHeader(refreshingBlock: { weakSelf?.pageManager.pageNo = XXXLimitNumberStarPage weakSelf?.loadData() }) }

func createNav() { self.navigationItem.title = "理财产品" }

func createCV() {

self.tableView.register(XXXFinancialProductCell.self, forCellReuseIdentifier: cellID) self.tableView.backgroundColor = Normal_458Color self.tableView.separatorStyle = .none self.tableView.estimatedRowHeight = 0 self.tableView.estimatedSectionFooterHeight = 0 self.tableView.estimatedSectionHeaderHeight = 0 ///顶部间隙 let topGrayView = UIView(frame: CGRect(x: 0, y: 0, width: XXXSCREENW, height: 8)) topGrayView.backgroundColor = self.tableView.backgroundColor self.tableView.tableHeaderView = topGrayView } }

//MARK:表代理 extension XXXFinancialFroductListVC { override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return self.pageManager.dataArr.count }

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell: XXXFinancialProductCell = tableView.dequeueReusableCell(withIdentifier: cellID) as! XXXFinancialProductCell self.addTask(indexPath) { (indexP) -> Bool in cell.kaDunHandler(self.pageManager.dataArr, tableView, indexP) return true } cell.kaDunHandler2(self.pageManager.dataArr, tableView, indexPath) return cell }

override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat { return 128 }

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { let final = FinancialDetailVC() let model = pageManager.dataArr[indexPath.row] as! ProjectModel

final.homeModel = model final.idStr = model.id self.navigationController?.pushViewController(final, animated: true, withHideBottomBarWhenPush: true, pop: false) }

}

//MARK:处理卡顿 extension XXXFinancialFroductListVC {

///添加新的任务的方法! func addTask(_ indexP: IndexPath, unit: @escapingRunloopBlock) { self.tasksArr.append(unit) self.tasksIndexPathArr.append(indexP) //判断一下 保证没有来得及显示的cell不会绘制 if self.tasksArr.count > self.maxQueueLength { _ = self.tasksArr.remove(at: 0) _ = self.tasksIndexPathArr.remove(at: 0) } } ///添加runloop的监听 fileprivate func addRunloopObserver() { //获取当前RunLoop let runLoop: CFRunLoop = CFRunLoopGetCurrent() //定义一个上下文 var context: CFRunLoopObserverContext = CFRunLoopObserverContext(version: 0, info: unsafeBitCast(self, to: UnsafeMutableRawPointer.self), retain: nil, release: nil, copyDescription: nil) //定义一个观察者 if let observer = CFRunLoopObserverCreate(kCFAllocatorDefault, CFRunLoopActivity.beforeWaiting.rawValue, true, 0, self.observerCallbackFunc(), &context){ //添加当前RunLoop的观察者 CFRunLoopAddObserver(runLoop, observer, .commonModes); } } ///回调函数 func observerCallbackFunc() -> CFRunLoopObserverCallBack { return {(observer, activity, context) -> Void in if context == nil {//如果没有取到 直接返回 return } // 崩溃的与原因不在这里 isFromADGuide 的问题 不应该取反 //取出上下文 就是当前的vc let vc = unsafeBitCast(context, to: XXXFinancialFroductListVC.self) //取出任务 if let unit = vc.tasksArr.first, let indexP = vc.tasksIndexPathArr.first { var result = false while (result == false && !vc.tasksArr.isEmpty && !vc.tasksIndexPathArr.isEmpty){ //执行任务 result = unit(indexP); //干掉第一个任务 _ = vc.tasksArr.remove(at: 0) _ = vc.tasksIndexPathArr.remove(at: 0) } } } } }

//MARK:列表数据请求 extension XXXFinancialFroductListVC { fileprivate func loadData() { XXXNetService.productsList(withDict: ["XXX":"x","pageNo":self.pageManager.pageNo,"pageSize":XXXLimitNumberPageSize], onSuccess: { (result) in

//隐藏加载框 self.view.hideHUDLoading(0)

//坑 一定记得加可选值 否则 footer可能不存在 self.tableView.mj_header?.endRefreshing() self.tableView.mj_footer?.endRefreshing()

let resultList: [Any]? = JSON(result asAny).dictionaryValue["productsList"]?.arrayObject

if self.pageManager.pageNo == XXXLimitNumberStarPage { self.pageManager.dataArr.removeAll() //下拉清除任务 self.tasksArr.removeAll() self.tasksIndexPathArr.removeAll() }

if let count = resultList?.count, count >= XXXLimitNumberPageSize{ self.pageManager.pageNo += XXXLimitNumberStarPage weak var weakSelf = self self.tableView.mj_footer = WLRefreshFooter(refreshingBlock: { weakSelf?.loadData() }) }else{ self.tableView.mj_footer?.endRefreshingWithNoMoreData() } self.pageManager.dataArr.append(contentsOf: ProjectModel .mj_objectArray(withKeyValuesArray: resultList)) self.tableView.reloadData()

}) { (code, errMsg) in //隐藏加载框 self.view.hideHUDLoading(0) self.tableView.mj_header?.endRefreshing() self.tableView.mj_footer?.endRefreshing() } } }