iOS如何在少数数据表中搜索数据Parse Swift 4

Question

我有搜索模块，它连接到解析。

我想从几个数据表库中进行搜索。

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
}

要搜索条形码，请输入以下代码：

 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()
            }

        }
    }

}

我得到了这种类型的错误：

原因：“ or查询的所有子查询应在同一类上。”

可以在少数几个数据库中进行搜索？

Answer 1

一次搜索一个类别， orQuery对同一类别的子查询进行查询

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()
        }
    }
}

或更确切地说：

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()
            }
        }
    }

}