我怎么知道重新加载数据已经完成



我有一个带有一些单元格的表格视图,该单元格有一个开始活动指示器的屁股,它会更新该单元格,但我尝试仅在 reloadData(( 完成时才完成我的活动指标,但使用我在dispatch_async中看到的答案不起作用,因为指标首先完成,然后更新表格视图

编辑

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
})

这是我的加载视图((

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()
}
}

没有任何方法可以告诉您UITableView已完成加载所有单元格。解决方法是在获取此 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:方法中调用loadView((。

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