使用自定义单元格从搜索更新tableView

debugcn 发表于 Dev

珍娜

我试图根据在搜索栏中搜索到的内容更新tableView。我有三个要更新的标签，因此当用户搜索名称时，似乎每个学校的数据都是正确的。但是我总是收到一个致命错误，说索引超出范围，但是索引是1。我一直在打印索引，并且数组中有两个以上的对象。数据是从api接收的，并且数据显示得很好，就在我尝试搜索时。

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int)-> Int {
        if searching {
            return searchCollege.count
        }
        else {
            return resultArray.count

        }
    }
}


extension ViewController: UISearchBarDelegate {
    func searchBar(_ searchBar: UISearchBar, textDidChange searchText:String){

      let collegeNames = resultArray.map{$0.userSchool_name}

        names = collegeNames.filter({$0!.prefix(searchText.count) == searchText}) as! [String]

        for i in 0...resultArray.count
        {
            if names.contains(resultArray[i].userSchool_name!){
                print("Here's the value of i")
                print(i)
**gets caught at this line*** searchCollege[i].schoolName = resultArray[i].userSchool_name!
                searchCollege[i].admRate = String(resultArray[i].admission_rate!)
                searchCollege[i].actScores = String(resultArray[i].act_Scores_midCum!)
                searchCollege[i].satScores = String(resultArray[i].sat_Scores_midCum!)

            }
        }

        if (searchCollege.count == 0) {
            self.searchCollege[0].schoolName = "No Result"
            self.searchCollege[0].admRate = " "
            self.searchCollege[0].actScores = " "
            self.searchCollege[0].satScores = " "


        }
        searching = true
        tableView.reloadData()
    }

用户速拨

struct Root: Codable {
    let results : [Users]

}

struct Users: Codable {
    let userSchool_name: String?
    let admission_rate: Float64?
    let sat_Scores_midCum: Float64?
    let act_Scores_midCum: Float64?

    enum CodingKeys: String, CodingKey {
        case userSchool_name = "school.name"
        case admission_rate = "latest.admissions.admission_rate.overall"
        case sat_Scores_midCum = "latest.admissions.sat_scores.average.overall"
        case act_Scores_midCum = "latest.admissions.act_scores.midpoint.cumulative"
    }
}

瓦迪安

该for回路只适用于这两种形式

for i in 0...resultArray.count - 1 { ...

或（推荐）

for i in 0..<resultArray.count { ...

但是还有一种更有效的语法

for (index, element) in resultArray.enumerated()
{
    if names.contains(element.userSchool_name!){
        print("Here's the value of index", index)
        searchCollege[index].schoolName = element.userSchool_name!
        searchCollege[index].admRate = String(element.admission_rate!)
        searchCollege[index].actScores = String(element.act_Scores_midCum!)
        searchCollege[index].satScores = String(element.sat_Scores_midCum!)
    }
}

并且请注意，如果searchCollege为空，您的代码也将可靠地崩溃

编辑：

根据numberOfRowsInSection方法为什么不简单

func searchBar(_ searchBar: UISearchBar, textDidChange searchText:String){

  if searchText.isEmpty {
     searchCollege.removeAll()
     searching = false
  } else {
     searchCollege = resultArray.filter{ $0!.userSchool_name.range(of: searchText, options: [.anchored, .caseInsensitive]) != nil }
     searching = true
  {
  tableView.reloadData()
}

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