数据从全局数组中消失
问题描述:
我在我的父类中定义了一个全局数组,我试图从JSON
文件中调用REST
服务GET
服务GET
填充对象。我的想法是,我定义了全局数组,并填充从JSON文件填充的对象,然后将在我的内部类中使用这些数据。但我注意到数据被填满了,它正确地得到了数据,数据被输入到了数组中,但是一切都在方法之外被删除了。在内部类中,数据不存在,甚至不在网络请求范围内。我无法想象问题是什么。数据从全局数组中消失
这里是我的数组的初始化的全局数组:
class ContentDeliveryViewController: UITableViewController, UISearchBarDelegate, UISearchDisplayDelegate{
public var ListOfFiles: [Asset_Content] = []
public var ListOfTags: [String] = []
这里是获取JSON和与这表明括号外的列入报表打印的阵列填充方法该阵列已空。
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
print("short CALLED")
let cell = self.tableView.dequeueReusableCell(withIdentifier: "ContentDeliveryCell", for: indexPath as IndexPath) as! ContentDeliveryCell
var content: AWSContent
//fix this
if(tableView == self.searchDisplayController?.searchResultsTableView){
print("search part called!!")
content = filteredList[indexPath.row]
}else{
content = contents![indexPath.row]
}
if(content.key.contains(IDENTIFIER)){
//
let url = URL(string: URL)
let task = URLSession.shared.dataTask(with: url!){
data, response, error in guard error == nil else{
print(error!)
return
}
guard let data = data else{
print("Data is empty")
return
}
let json = try! JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.allowFragments) as? [[String: AnyObject]]
var asset: Asset_Content
for jay in json! {
let category = jay["BIGCATEGORY"] as? String
let diagnosis = jay["DIAGNOSIS"] as? String
let perspective = jay["PERSPECTIVE"] as? String
let name = jay["NAME"] as? String
let title = jay["Title"] as? String
let UnparsedTags = jay["TAGS"] as? String
let filename = jay["FILENAME"] as? String
let tagArray = UnparsedTags?.characters.split(separator: ",")
for tag in tagArray!{
if(self.ListOfTags.contains(String(tag))){
}else{
self.ListOfTags.append(String(tag))
print("TAGCOUNT == ", self.ListOfTags.count)
}
}
asset = Asset_Content(category!, diagnosis!, perspective!, name!, title!, filename!)
self.loadJson(forFile: asset)
print("RightCount === ", self.ListOfFiles.count)// FILLED ARRAY
}
print("FirstCount === ", self.ListOfFiles.count)//FILLED ARRAY
}
task.resume()
cell.isHidden = true
print("FirstCount === ", self.ListOfFiles.count)// EMPTY ARRAY
print("TAGCOUNT == ", self.ListOfTags.count) // EMPTY ARRAY
return cell
}else{
cell.prefix = prefix
cell.content = content
print("KEY" ,content.key)
cell.isHidden = false
return cell
}
}
答
正确方法:
- 负载数据
- 解析JSON到对象
- commit对象细胞(由例如:cell.object = ...),并让细胞本身配置
- 刷新表格视图
'cellForRowAt'是错误的地方下载和pa rse JSON。你的数组是空的,因为'dataTask'异步工作。 – vadian
如何在完成数据后加载数据? –