iOS如何在少数Data表中搜索数据Parse swift 4
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我有搜索模块,它连接到解析。
我想从几个数据表基础上进行搜索。
为了搜索我使用下一个代码:
var searchResult = [String]()
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return searchResult.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = searchResult[indexPath.row]
return cell
}
对于搜索栏这段代码:
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
searchBar.resignFirstResponder()
let firstQuery = PFQuery(className: "fried")
firstQuery.whereKey("best", contains: searchBar.text)
let seccondQuery = PFQuery(className: "home")
seccondQuery.whereKey("home", contains: searchBar.text)
let query = PFQuery.orQuery(withSubqueries: [firstQuery,seccondQuery])
query.findObjectsInBackground { (result, error) in
if let objects = result {
self.searchResult.removeAll(keepingCapacity: false)
for object in objects {
let question = object.object(forKey: "question") as! String
let answer = object.object(forKey: "answer1") as! String
let test = question + " " + answer
self.searchResult.append(test)
}
DispatchQueue.main.async {
self.tableView.reloadData()
self.resignFirstResponder()
}
}
}
}
我遇到了这种错误:
原因:'
or
查询的所有子查询应该在同一个类上。
可以在少数数据库中进行搜索吗?
答案
一次搜索一个类,orQuery
在同一个类的子查询上完成
self.searchResult.removeAll(keepingCapacity: false) // Start by emptying the search resulys array
firstQuery.findObjectsInBackground { (result, error) in
if let objects = result {
for object in objects {
let question = object.object(forKey: "question") as! String
let answer = object.object(forKey: "answer1") as! String
let test = question + " " + answer
self.searchResult.append(test)
}
DispatchQueue.main.async {
self.tableView.reloadData()
self.resignFirstResponder()
}
}
}
seccondQuery.findObjectsInBackground { (result, error) in
if let objects = result {
for object in objects {
let question = object.object(forKey: "question") as! String
let answer = object.object(forKey: "answer1") as! String
let test = question + " " + answer
self.searchResult.append(test)
}
DispatchQueue.main.async {
self.tableView.reloadData()
self.resignFirstResponder()
}
}
}
或者更有说服力:
let queryArry = [firstQuery, secondQuery]
for query in queryArray {
query.findObjectsInBackground { (result, error) in
if let objects = result {
for object in objects {
let question = object.object(forKey: "question") as! String
let answer = object.object(forKey: "answer1") as! String
let test = question + " " + answer
self.searchResult.append(test)
}
DispatchQueue.main.async {
self.tableView.reloadData()
self.resignFirstResponder()
}
}
}
}
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