想要引用回源数组的索引表视图

Question

在 iOS/Swift 中，我基于 Client 类中的 clientName 属性创建了一个索引的"client"UITableView。我创建了一个以 A 到 Z 作为部分的字典。索引表视图效果很好。但是，我正在尝试找出一种方法来确定当用户选择一行时它在原始源数组中的哪一行。我正在考虑构建某种类型的交叉引用数组，除了字典最终排序以匹配部分，所以我不知道哪个部分/行组合与哪个原始数组条目匹配。是否有处理此问题的常用方法？

为了澄清...

class Client {
    var clientId             : Int!
    var firstName            : String!
    var lastName             : String!
    var email                : String!
    var phone                : String!
    ...
    init() {
    }
}
var clients: [Client] = []
// clients array loaded from web service
...
// Create dictionary to be source for indexed tableview
func createClientDict() {
    clientDict          = [String: [String]]()
    clientSectionTitles = [String]()
    var clientNames:[String] = []
    for i in 0..<clients.count {
        let client = clients[i]
        let clientName = "(client.lastName), (client.firstName)"
        clientNames.append(clientName)
    }
    for name in clientNames {
        var client: Client  = Client()
        // Get the first letter of the name and build the dictionary
        let clientKey = name.substringToIndex(name.startIndex.advancedBy(1))
        if var clientValues = clientDict[clientKey] {
            clientValues.append(name)
            clientDict[clientKey] = clientValues
        } else {
            clientDict[clientKey] = [name]
        }
    }
    // Get the section titles from the dictionary's keys and sort them in ascending order
    clientSectionTitles = [String](clientDict.keys)
    clientSectionTitles = clientSectionTitles.sort { $0 < $1 }
}

现在，当用户点击表视图中的一行时，我可以获取该部分和行（indexPath）。但是，假设可能存在重复的名称，如何确定客户端数组中的哪一行是匹配的？有没有办法创建动态映射到源数组中行的索引部分/行的交叉引用？我打算在构建字典时尝试这样做，除了字典之后被排序，所以没有什么可以匹配的。也许我应该以某种方式将源行号包含在字典中/与字典一起？

下面是表视图代码：

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("Cell") as! ClientCell
    let clientKey = clientSectionTitles[indexPath.section]
    if let clientValues = clientDict[clientKey] {
        cell.clientName.text = clientValues[indexPath.row]
    }
    return cell
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return clientSectionTitles.count
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    let clientKey = clientSectionTitles[section]
    if let clientValues = clientDict[clientKey] {
        return clientValues.count
    }
    return 0
}
func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
    return clientSectionTitles[section]
}
func sectionIndexTitlesForTableView(tableView: UITableView) -> [String]? {
    return clientIndexTitles
}
func tableView(tableView: UITableView, sectionForSectionIndexTitle title: String, atIndex index: Int) -> Int {
    guard let index = clientSectionTitles.indexOf(title) else {
        return -1
    }
    return index
}
func tableView(tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
    return 20
}
func tableView(tableView: UITableView, willDisplayHeaderView view: UIView, forSection section: Int) {
    let headerView   = view as! UITableViewHeaderFooterView
    headerView.contentView.backgroundColor = UIColor ( red: 0.0, green: 0.3294, blue: 0.6392, alpha: 1.0 )
    headerView.textLabel?.textColor = UIColor.greenColor()
    headerView.textLabel?.font = UIFont(name: "Noteworthy-bold", size: 15.0)
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    selectedIndex = indexPath
    // In the following prepare for segue, I need to somehow use the selected indexpath to find the correct entry
    // in the clients array and pass it along.
    performSegueWithIdentifier("clientDetailSegue", sender: self)
}

Answer 1

我想通了。我没有意识到（直到我最近尝试过）你可以在字典中嵌套任何类的数组。当我更改字典以将客户端数组嵌套在其中时，一切都解决了。我更改了我的函数，如下所示。

func createClientDict() {
    // Declared for view controller. Re-initialized here.
    clientDict          = [String: [Client]]()
    clientSectionTitles = [String]()
    clients.sortInPlace ({ $0.lastName < $1.lastName })
    for c in clients {
        let clientName = "(c.lastName), (c.firstName)"
        // Get the first letter of the name and build the dictionary
        let clientKey = clientName!.substringToIndex(clientName!.startIndex.advancedBy(1))
        if var clientValues = clientDict[clientKey] {
            clientValues.append(c)
            clientDict[clientKey] = clientValues
        } else {
            clientDict[clientKey] = [c]
        }
    }
    // Get the section titles from the dictionary's keys and sort them in ascending order
    clientSectionTitles = [String](clientDict.keys)
    clientSectionTitles = clientSectionTitles.sort { $0 < $1 }
}

但是，这条线是解决方案的关键：

let clientDict = [String: [Client]]()