我通过JSON获取数据,当我滚动屏幕时,我有一个请求到服务器,有时数据可以结束,然后应用程序崩溃insertRows
我该如何解决它?insertView在表查看
这里我的代码:
override func scrollViewDidScroll(_ scrollView: UIScrollView) {
if (!isMoreDataLoading) {
let down = "https://--.com/local/apps/apple/events.php/?nPageSize=\(nPageSize)&iNumPage=\(iNumPage)"
let scrollViewContentHeight = tableView.contentSize.height
let scrollOffsetThreshold = scrollViewContentHeight - tableView.bounds.size.height
if(scrollView.contentOffset.y > scrollOffsetThreshold && tableView.isDragging) {
isMoreDataLoading = true
requestD(url: down)
}
}
}
func requestD(url:String){
var urlRequest = URLRequest(url: URL(string: url)!)
urlRequest.timeoutInterval = 300
let task = URLSession.shared.dataTask(with: urlRequest) { (data,response,error) in
if error != nil{
print(error ?? 0)
return
}
do{
let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as! [String : AnyObject]
if let newsJson = json["EVENTS"] as? [[String : AnyObject]] {
for newJson in newsJson{
let info = Modal()
info.id = newJson["ID"] as? String
info.name = newJson["NAME"] as? String
if newJson["PICTURE"] as? String != nil {
info.ImageViewURL = newJson["PICTURE"] as! String
}
if newJson["PICTURE_DETAIL"] as? String != nil {
info.ImageViewURLDetail = newJson["PICTURE_DETAIL"] as! String
}
info.stmp = newJson["STMP"] as? Int
info.text = newJson["DETAIL_TEXT"] as? String
info.name = info.name?.replacingOccurrences(of: "&[^;]+;", with: "", options: String.CompareOptions.regularExpression, range: nil)
info.text = info.text?.replacingOccurrences(of: "&[^;]+;", with: "", options: String.CompareOptions.regularExpression, range: nil)
if self.isRefresh == true {
self.modals.insert(info, at: 0)
} else {
self.modals.append(info)
}
}
}
} catch let error {
print(error)
}
DispatchQueue.main.sync {
self.iNumPage += 1
self.isMoreDataLoading = false
self.Preload.preloadEnd(tableView: self.tableView)
// self.tableView.reloadData()
self.tableView.beginUpdates()
self.tableView.insertRows(at: [IndexPath(row: self.modals.count - 1, section: 0)], with: .automatic)
self.tableView.endUpdates()
}
}
task.resume()
}
原因:'Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (5) must be equal to the number of rows contained in that section before the update (0), plus or minus the number of rows inserted or deleted from that section (1 inserted, 0 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).'
什么是崩溃消息? – Paulw11
@ Paulw11有问题的原因 – Vasya2014