表格中按字母顺序排列的节速览表 [英] Alphabetical sections in table table view in swift

问题描述

我有一个按字母顺序排列的名称列表，现在我想在表格视图中显示这些名称.我正在努力将每个字母的这些名称分组.

I have a list of names sorted alphabetically, and now I want display these names in a table view. I'm struggling with grouping these names for each letter.

我的代码如下:

let sections:Array<AnyObject> = ["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"]
var usernames = [String]()

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell{
    
    let cellID = "cell"
    
    let cell: UITableViewCell = self.tv.dequeueReusableCellWithIdentifier(cellID) as UITableViewCell
    
    cell.textLabel?.text = usernames[indexPath.row]
    
return cell
}

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
    
    return usernames.count
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int{
    
    return 26
}


func sectionIndexTitlesForTableView(tableView: UITableView) -> [AnyObject]!{
    
    return self.sections
}

func tableView(tableView: UITableView,
    sectionForSectionIndexTitle title: String,
    atIndex index: Int) -> Int{
        
        return index
}

func tableView(tableView: UITableView,
    titleForHeaderInSection section: Int) -> String?{
        
        return self.sections[section] as? String
}

除了分组使我的表格视图最终像这样:

and it all works pretty good except for the grouping which makes my table view end up like this:

所以我知道您应该能够在Array中使用过滤后的函数，但是我不知道如何实现它.

So I know you should be able to use the filtered function in an Array, but I did not understand how to implement it.

任何有关进行方法的建议将不胜感激.

Any suggestions on how to proceed would be appreciated.

推荐答案

您可以将带有名称的数组放入带有字母键的字典中.

You can put your arrays with names into dictionary with letter keys.

例如

var names = ["a": ["and", "array"], "b": ["bit", "boring"]]; // dictionary with arrays setted for letter keys

然后您需要以另一种方式访问​​字典中的值

then you need to access values in your dictionary in the next way

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
    return names[usernames[section]].count; // maybe here is needed to convert result of names[...] to NSArray before you can access count property
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell{

    let cellID = "cell"

    let cell: UITableViewCell = self.tv.dequeueReusableCellWithIdentifier(cellID) as UITableViewCell

    cell.textLabel?.text = names[usernames[indexPath.section]][indexPath.row]; // here you access elements in arrray which is stored in names dictionary for usernames[indexPath.section] key

return cell
}

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