Swift 3 - 根据字符串变量过滤数组

Question

Swift 3 - 根据字符串变量过滤数组

3

首先声明，我对Swift是新手。我有一个标签，显示了一个用户输入的变量，这个变量已经从上一个视图控制器传递过来。在该标签下方是一个表格视图。目前，表格视图正在显示我在视图中硬编码的城市数组。我希望该表格视图根据标签中显示的变量进行筛选。也就是说，如果标签显示“拉斯维加斯”，我希望表格视图仅显示包含“拉斯维加斯”的行。我遇到的问题是筛选。以下是我目前所拥有的内容。

import UIKit

class ResultsViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

let cities = [
    ("Orlando", "FL, United States", "Location"),
    ("Orlando", "AR, United States", "Location"),
    ("Orlando", "KY, United States", "Location"),
    ("Orlando", "NC, United States", "Location"),
    ("Orlando", "OK, United States", "Location"),
    ("Orlando", "NY, United States", "Location"),
    ("Orlando", "VA, United States", "Location"),
    ("Orlando", "WV, United States", "Location"),
    ("Las Vegas", "NV, United States", "Location"),
    ("Las Vegas", "TX, United States", "Location"),
    ("Las Vegas", "NM, United States", "Location"),
    ("Scottsdale", "AZ, United States", "Location"),
    ("Scottsdale Plaza", "PA, United States", "Location"),
    ("Scottsdale Pond", "CA, United States", "Location"),
    ("Scottsdale Park", "IL, United States", "Location")]



public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return(cities.count)
}

public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! ResultsControllerTableViewCell
    let (labelCity, labelState, labelType) = cities[indexPath.row]
    cell.cityName.text = labelCity
    cell.stateName.text = labelState
    cell.resultType.text = labelType
    return(cell)
}

@IBOutlet weak var userSearchInputLabel: UILabel!

var searchItem = String()



override func viewDidLoad() {

    super.viewDidLoad()
    self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
    self.navigationController?.navigationBar.shadowImage = UIImage()
    self.navigationController?.navigationBar.isTranslucent = true
    userSearchInputLabel.text = searchItem
     self.extendedLayoutIncludesOpaqueBars=true;

}

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

override func viewWillAppear(_ animated: Bool)
{
    super.viewWillAppear(animated)
    self.navigationItem.hidesBackButton = true
}

- Jason Tremain

1个回答

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Kevin DiTraglia · Accepted Answer

相当基础的骨架代码：

public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return cities.filter { $0.contains(self.filterText) }.count
}

public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! ResultsControllerTableViewCell
    let (labelCity, labelState, labelType) = cities.filter { $0.contains(self.filterText) }[indexPath.row]
    cell.cityName.text = labelCity
    cell.stateName.text = labelState
    cell.resultType.text = labelType
    return(cell)
}

public func textViewDidChange(sender: UITextView, newText: String) {
    self.filterText = newText
    self.tableView.reloadData()
}

我没有使用集成开发环境编写这段代码，可能会有一些语法错误，但基本上是将你的表视图更改为根据某个过滤文本进行筛选，该文本在每次更新文本视图时更新。