swift - 我们如何用 swift 语言对 uitableview 数据进行排序(升序和降序)

Question

我有一个关于 uitableview 的问题。我在 uitableview 中有一个水果列表，在右侧导航栏中有一个过滤器按钮。当我们点击过滤器按钮时，我们如何对水果列表进行排序。我应该在 filterList 函数中做什么。下面是代码，请看。

/* Fruit.swift */

import Foundation

class Fruit {
    var fruitName = ""

    init(fruitName: String) { self.fruitName = fruitName }

}


class FruitsListViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

    @IBOutlet var fruitList: UITableView!

    @IBOutlet var filterItem: UIBarButtonItem!

    var fruitArr:[Fruit] = Fruit

    override func viewDidLoad() {
        super.viewDidLoad()

        var barButton = UIBarButtonItem(title: "Filter", style: .Plain, target: self, action:"filterList") 
        self.navigationItem.rightBarButtonItem = barButton

        var fruits1 = Fruit(fruitName: "Apple" as String) 
        var fruits2 = Fruit(fruitName: "Mango" as String) 
        var fruits3 = Fruit(fruitName: "Banana" as String) 
        var fruits4 = Fruit(fruitName: "Orange" as String)

        fruitArr.append(fruits1)
        fruitArr.append(fruits2) 
        fruitArr.append(fruits3) 
        fruitArr.append(fruits4)
        }

    func filterList() {/* ? */}

    override func didReceiveMemoryWarning() {
          super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated.
     }

        func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int {       
         return fruitArr.count
         }

        func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! {
          let cell:ShowFruitCustomCellTableViewCell = tableView.dequeueReusableCellWithIdentifier('FruitCell') as ShowFruitCustomCellTableViewCell
          let fruit = fruitArr[indexPath.row] cell.setCell(fruit.fruitName) return cell
    }
    }
}

Answer 1

好吧，就像听起来一样 - 您可以过滤列表:

func filterList() { // should probably be called sort and not filter
    fruitArr.sorted() { $0.fruitName > $1.fruitName } // sort the fruit by name
    fruitList.reloadData(); // notify the table view the data has changed
}

如果您只想反转项目而不是实际对它们进行排序(切换顺序)，您可以执行 fruitArr.reverse() 而不是排序。