我怎么知道reloadData已经完成了

时间:2017-07-19 20:42:32

标签: swift tableview reloaddata

我有一个TableView,其中一些单元格有一个开始一个Activityindicator,但它更新了那个单元格,但是我只是在reloadData()完成后才尝试完成我的ActivityIndi​​cator,但是我看到了答案使用dispatch_async,因为指标首先完成,然后它更新了TableView

,因此无法正常工作

修改

DispatchQueue.main.async(execute: {

              self.tableView.reloadData()

              //From here
              self.initOrEndMed = false                                           
              let myAlert = UIAlertController(title: "Alerta", message: "Tratamento finalizado", preferredStyle: UIAlertControllerStyle.alert)
              let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.cancel, handler: {(alert: UIAlertAction!) -> Void in

                                         self.loadingView(loadingText: "", on: false)  

                                        })

              myAlert.addAction(okAction)
              self.present(myAlert, animated: true, completion: nil)
             //To here i want to do after reloadData has finished
                                    })

这是我的loadingView()

func loadingView(loadingText: String, on: Bool) {

    self.labelForLoad.text = loadingText
    self.labelForLoad.textAlignment = .center
    self.labelForLoad.numberOfLines = 2
    self.labelForLoad.sizeToFit()
    self.labelForLoad.textColor = UIColor(red:0.24, green:0.69, blue:1.00, alpha:1.0)
    self.labelForLoad.center = CGPoint(x: activityIndicator.center.x, y: activityIndicator.center.y + 40)

    self.overlay.center = CGPoint(x: self.view.bounds.midX, y: self.view.bounds.midY)
    self.overlay.addSubview(labelForLoad)

    if on {

        UIView.beginAnimations(nil, context: nil)
        UIView.setAnimationDuration(0.5)
        overlay.alpha = overlay.alpha > 0 ? 0 : 0.95
        UIView.commitAnimations()
        self.view.isUserInteractionEnabled = false
        activityIndicator.startAnimating()

    } else {

        self.view.isUserInteractionEnabled = true
        overlay.alpha = 0
        activityIndicator.stopAnimating()
    }

}

1 个答案:

答案 0 :(得分:1)

没有任何方法可以告诉您UITableView已经完成加载所有单元格。解决方法是在获得此dataSource回调时检查indexPath.row是否是数据集中的最后一项 -

  

tableView(UITableView,cellForRowAt:IndexPath)

然后从cellForRowAt:method。

中调用loadingView()