来自数组索引的表视图超出范围

Posted 2023-03-03

【中文标题】来自数组索引的表视图超出范围

【英文标题】：Table view from array index out of range

【发布时间】：2015-12-07 17:36:20

【问题描述】：

我正在使用数组从数据库中读取数据，目前我在数组中有 8 个项目。我正在尝试制作一个有节标题的表格。目前我有 4 个部分，我已经正确设置它并且它可以工作。它也可以第一次运行，但是当我尝试向后滚动时，索引超出了范围。我正在使用 myarray[myindex] 为每个项目设置单元格数据，但这不起作用。

看来我需要将我的数据分成 4 个部分，每个部分只包含每个部分的数据，以让表格视图正确控制它。数据可以包含任意数量的部分。

有没有更好的方法来做到这一点？

我附上了一张图片来描述这个问题。

谢谢

根据要求添加代码。

  override func numberOfSectionsInTableView(tableView: UITableView) -> Int 
    // #warning Incomplete implementation, return the number of sections
    print("Returning Sections - > \(sections)")
    return sections //seems to work


override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
    // #warning Incomplete implementation, return the number of rows
    print("Return number of rows in section -> \(noRowsInSection[section])")
    return noRowsInSection[section] // seems to work

override func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? 
    return sectionHeader[section] // seems to work

override func tableView(tableView: UITableView, willDisplayHeaderView view: UIView, forSection section: Int) 
    // Format for section Headers
    let header:UITableViewHeaderFooterView = view as! UITableViewHeaderFooterView
    header.textLabel!.textColor = UIColor.blueColor()
    UIColor.blueColor()
    header.textLabel!.font = UIFont.boldSystemFontOfSize(12)
    header.textLabel!.frame = header.frame
    header.textLabel!.textAlignment = NSTextAlignment.Right

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell 
    let cell = tableView.dequeueReusableCellWithIdentifier("OurCell", forIndexPath: indexPath) as! OurTableViewCell
    print("myindex - > \(myindex) row -> \(indexPath.row)")
    cell.OurCellLabel.text = MyHouses[myindex].getAddressDetails()        // End configure houses.cell
    //cell.OurCellLabel.text = MyHouses[indexPath.row].getAddressDetails()        // End configure houses.cell
    myindex++ // PROBLEM HERE - GOES OUT OF RANGE
    return cell

这里我从 sqlite DB 获取数据

func GetListOfHousesFromDB() 
    let docsDir = dirPaths[0]
    let databasePath = docsDir.stringByAppendingString("/newdb.db")
    if fileMgr.fileExistsAtPath(databasePath as String) 
        let houseDB = FMDatabase(path: databasePath as String)
        if houseDB.open() 
            var noRows: Int = 0
            var sql = "select count(Address) as cnt from Houses" // Define Query
            houseDB.executeStatements(sql) // Execute Query
            let results:FMResultSet? = houseDB.executeQuery(sql,withArgumentsInArray: nil) //Get results from Query
            if results?.next() == true 
                let cnt = (results?.stringForColumn("cnt"))! // Retrieve number of rows from DB
                noRows = Int(cnt)!
            
            var i = 0
            sql = "SELECT Address, Street, City, State, Zip from Houses ORDER BY State, City, Street, Address" // Define Query
            houseDB.executeStatements(sql) // Execute Query
            let results2:FMResultSet? = houseDB.executeQuery(sql,withArgumentsInArray: nil) // Get results from Query
            while results2?.next() == true 
                MyHouses.append(newhouse())
                MyHouses[i].address = (results2?.stringForColumn("Address"))!
                MyHouses[i].street = (results2?.stringForColumn("Street"))!
                MyHouses[i].city = (results2?.stringForColumn("City"))!
                MyHouses[i].state = (results2?.stringForColumn("State"))!
                MyHouses[i].zip = (results2?.stringForColumn("Zip"))!
                print("Address -> \(i) \(MyHouses[i].getAddressDetails())")
                i++
            
        
        houseDB.close()
    

【问题讨论】：

向我们展示一些相关代码，尤其是cellForRowAtIndexPath、numberOfRowsInSection 和numberOfSectionsInTableview 方法

【参考方案1】：

基于您的另一个post，您需要更新的House 模型和更新的数据结构来处理表格视图的数据。

房屋 - 模型类

struct House 
    var address: String
    var street: String
    var city: String
    var state: String
    var zip: String

    func getAddressDetails() -> String 
        return "\(address) \(street) \(city) \(state) \(zip)"
    

    func getCityState() -> String 
        return "\(city) - \(state)"
    
  

加载数据的帮助类

class HouseDataHelper 

    private static let _sharedInstance = HouseDataHelper()
    var myHouses: Dictionary<String, [House]> = [:]

    private init() 
        loadHouseData()
    

    static func sharedInstance() -> HouseDataHelper 
        return _sharedInstance
    

    private func loadHouseData() 
        var houses = [House]()

        //Populating your actual values here. GetListOfHousesFromDB()

        //Loading dummy data for testing
        var sectionHeader = ""
        for i in 0...4 
            sectionHeader = "Header \(i)"
            houses += [House(address: "Address1", street: "Street1", city: "City1", state: "State1", zip: "Zip1")]
            houses += [House(address: "Address2", street: "Street2", city: "City2", state: "State2", zip: "Zip2")]
            houses += [House(address: "Address3", street: "Street3", city: "City3", state: "State3", zip: "Zip3")]
            houses += [House(address: "Address4", street: "Street4", city: "City4", state: "State4", zip: "Zip4")]
            houses += [House(address: "Address5", street: "Street5", city: "City5", state: "State5", zip: "Zip5")]

            myHouses.updateValue(houses, forKey: sectionHeader)
            houses = []
        
    

表格视图控制器

class TableViewController: UITableViewController 

    var houses = HouseDataHelper.sharedInstance().myHouses
    var sectionHeaders: [String] = []

    override func viewWillAppear(animated: Bool) 
        super.viewWillAppear(animated)

        sectionHeaders = Array(houses.keys.sort())
    

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int 
        return houses.count
    

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
        if let rows = houses[sectionHeaders[section]] 
            return rows.count
        

        return 0
    

    override func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? 
        return sectionHeaders[section]
    

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell 
        //Populate cells based on "houses"
    

【讨论】：

我会试一试，有些东西我不太明白，但我们会看看我能不能让它工作......谢谢！

我最终使用了一个多维数组[section][row]。它正在工作。