UIRefresh 控件 endRefreshing 不起作用

Question

当通过向下滑动表格视图触发刷新控件时，如果没有互联网连接，则会显示警报并且刷新控件预计会结束刷新，但即使添加到主线程中也不会结束刷新

class JobsForCategoryVC: UIViewController {
    //MARK:-Outlets
    @IBOutlet weak var jobTableView: UITableView!
    @IBOutlet weak var activityIndicator: UIActivityIndicatorView!

    //MARK:-Properties
    var refreshControl:UIRefreshControl!
    var jobCategory:JobCategoryDB!
    var pageNumber:Int = 1
    var downloadMore:Bool = true
    var jobs = [JobModel]()


    //MARK:-LifeCycle
    override func viewDidLoad() {
        super.viewDidLoad()
        setupView()
        freshDownload()
    }

    func setupView(){

        refreshControl = UIRefreshControl()
        refreshControl.attributedTitle = NSAttributedString(string: "Loading fresh Jobs")
        refreshControl.addTarget(self, action: #selector(self.freshDownload), for: .valueChanged)
        jobTableView.addSubview(refreshControl)     

    }

    func freshDownload(){
        pageNumber = 1
        downloadMore = true
        downloadJobsFrom(top: true)
    }


    func downloadJobsFrom(top:Bool){
        if !refreshControl.isRefreshing && top{
            activityIndicator.startAnimating()
        }


        let url = URLStringList.getSearchCategoryJobString(pageNumber: pageNumber, categoryId: jobCategory.id!)

        if let url = URL(string: url){
            Alamofire.request(url, method: .get).responseJSON { (response) in

                if response.result.isSuccess{
                    let json = response.result.value

                    let model = Mapper<JobModel>().mapArray(JSONArray: json as! [[String : Any]])

                    if model?.count == 0{
                        self.downloadMore = false
                    }
                    if let jobs = model{
                        if top{
                              self.jobs = jobs
                        }else{
                            self.jobs += jobs
                        }

                        self.jobTableView.reloadData()
                        self.pageNumber += 1
                    }
                    self.refreshControl.endRefreshing()
                    self.activityIndicator.stopAnimating()

                }else{

                    self.activityIndicator.stopAnimating()
                    DispatchQueue.main.async(execute: {
                        self.refreshControl.endRefreshing()
                        self.jobTableView.reloadData()
                    })

                    if top{
                        showInternetConnectionAlert(viewController: self, activityIndicator: self.activityIndicator, completion: nil)
                    }
                }

            }
        }

    }
}


extension JobsForCategoryVC:UITableViewDataSource{

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if jobs.count > 0 {
            jobTableView.backgroundView = nil
            let cellCount = jobs.count + ((jobs.count-1)/(AdForNumberOfCells-1)) + 1
            return cellCount
        }

        jobTableView.backgroundView =  Bundle.main.loadNibNamed("PullToRefreshView", owner: nil, options: nil)?.first as? PullToRefreshView
        return 0
    }


    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        if indexPath.row % AdForNumberOfCells  == 0{
            if let cell = tableView.dequeueReusableCell(withIdentifier: "JobsAdTableViewCell", for: indexPath) as? JobsAdTableViewCell{
                cell.controller = self
                return cell
            }

        }else{

            if let cell = tableView.dequeueReusableCell(withIdentifier: "JobsTableViewCell", for: indexPath) as? JobsTableViewCell{
                 let index = NSIndexPath(item: indexPath.row-(indexPath.row/AdForNumberOfCells)-1, section: 0)
                cell.configure(job: jobs[index.row])
                return cell
            }

        }

        return UITableViewCell()
    }

}

extension JobsForCategoryVC:UITableViewDelegate{


    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        if let webView = storyboard?.instantiateViewController(withIdentifier: "WKWebVC") as? WKWebVC{
            if indexPath.row % AdForNumberOfCells == 0 {
                return
            }
            let index =  NSIndexPath(item: indexPath.row-(indexPath.row/AdForNumberOfCells)-1, section: 0)

            if let urlString = jobs[index.row].url{
                webView.url = urlString
                webView.titleString = jobs[index.row].title
                present(webView, animated: true, completion: nil)
            }

        }
    }

    func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
        if indexPath.row == self.jobs.count - 1 && downloadMore{
            downloadJobsFrom(top: false)
        }
    }
}

Answer 1

请在主线程中添加所有 UI 个过程。

成功块 => 将您的代码变成：

if let jobs = model{
     if top{
        self.jobs = jobs
     }else{
        self.jobs += jobs
     }
     self.pageNumber += 1                       
}

DispatchQueue.main.async(execute: {
     self.refreshControl.endRefreshing()
     self.activityIndicator.stopAnimating()
     self.jobTableView.reloadData()
})

失败块：

DispatchQueue.main.async(execute: {
     self.refreshControl.endRefreshing()
     self.activityIndicator.stopAnimating()
     self.jobTableView.reloadData()
})

无论成功还是失败，你所有的 UI 进度都必须包含在主线程中 thread.I 以为你忘了在成功中包含 UI 主线程中的更改 Block.Or 你可以这样做，

Alamofire.request(url, method: .get).responseJSON { (response) in
     if response.result.isSuccess{
          ...
     }else{
          ...
     }
     DispatchQueue.main.async(execute: {
          self.refreshControl.endRefreshing()
          self.activityIndicator.stopAnimating()
          self.jobTableView.reloadData()
     })
}

看一看：

RefreshControlDemo [Swift 3 Xcode 8]

Answer 2

这样做的简单方法是

DispatchQueue.main.async(execute: {
     self.jobTableView.reloadData()
     self.refreshControl.endRefreshing()
     self.activityIndicator.stopAnimating()
     self.refreshControl.setContentOffset(CGPoint.zero, animated: true)

})

Answer 3

将UITableView contentOffset设置为zero

在Swift3.0

refreshControl.endRefreshing()
self.yourTableView.contentOffset = CGPoint.zero

Answer 4

我发现了同样的问题

如果另一个使用 self.refresh.endRefreshing() 不起作用

我引入这段代码 -> UIRefreshControl().endRefreshing() 替换状态 self.refresh.endRefreshing()

 DispatchQueue.main.async {

       UIRefreshControl().endRefreshing()
       self.yourTableView.contentOffset = CGPoint.zero

 }

谢谢

UIRefresh 控件 endRefreshing 不起作用

UIRefresh control endRefreshing doesn't work

ios

swift

uirefreshcontrol