UIPickerView 和 UISearchController 不显示数据

Question

我目前遇到了一些麻烦，希望其中一位专家能够评估并回答我的问题。我制作了一个 UIPickerView 和一个 UISearchController（它在 UITableViewController 中），它们都没有显示我制作的数组中的数据。这是一个学校项目，直到星期二才到期，但我希望我能修复这些小（希望是错误）。我将向您展示我的 UIPickerView 和 UISearchController 的 ViewController。 所以这里是 UIPickerView ：

---

import UIKit

class SecondViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource, UITextFieldDelegate {

@IBOutlet weak var txtTest: UITextField!

@IBOutlet weak var Picker1: ThePickerView!
var sellInvestments = ["Airbnb", "CloudFlare", "GitHub", "slack", "Snapchat", "Uber"]

override func viewDidLoad() {
    super.viewDidLoad()

// Do any additional setup after loading the view.

    self.Picker1.delegate = self
    self.Picker1.dataSource = self
    [self.Picker1.reloadAllComponents]
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
func pickerView(_pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
    return sellInvestments[row]
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return sellInvestments.count
}
public func numberOfComponents(in pickerView: UIPickerView) -> Int {

    return 1
}

}

现在这里是 UITableViewController（用于 UISearch）

import UIKit

class NewTableViewController: UITableViewController, UISearchResultsUpdating {

let searchInvestments = ["Berlark Company", "Snapchat", "IBM", "Twitter", "Cornerstone on Demand", "Aukvern Capital", "Serene Technologies", "Viacom Industries", "Suvertec", "HIppit", "Avigti Technologies", "Avaret", "Sivlot", "Zebra Sci Automation", "Google", "Apple", "Facebook", "Gradience Imaging", "Vitris", "Voxtrat", "WhattsApp", "Apphat", "Nividia", "Kik", "Cyber Dust", "Turing Technologies", "Sobel Imaging Systems", "Yavid", "Tensor Automation", "Vistapint", "LinkedIn", "Yahoo", "Yelp", "TwitchTv", "OculusRift", "Lg", "Intel", "Amazon", "Sony", "Samsung", "Microsoft", "HP", "Vencore", "AT&T", "Verizon", "Dell", "MicroTech", "Flickr"]
var filteredInvestments = [String]()
var resultSearchController = UISearchController()
override func viewDidLoad() {
    super.viewDidLoad()
    self.resultSearchController = UISearchController(searchResultsController: nil)
    self.resultSearchController.searchResultsUpdater = self
    self.resultSearchController.dimsBackgroundDuringPresentation = false
    self.resultSearchController.searchBar.sizeToFit()
    self.tableView.tableHeaderView = self.resultSearchController.searchBar
    self.tableView.reloadData()



    // Uncomment the following line to preserve selection between presentations
    // self.clearsSelectionOnViewWillAppear = false

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem()
}

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

// MARK: - Table view data source

override func numberOfSections(in tableView: UITableView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return 1
}

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows
    if self.resultSearchController.isActive
    {
       return self.filteredInvestments.count
    }
    else {
        return self.searchInvestments.count

    }

}


override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as UITableViewCell?

    if self.resultSearchController.isActive
    {
        cell!.textLabel?.text = self.filteredInvestments[indexPath.row]
    }
    else {
        cell!.textLabel?.text = self.searchInvestments[indexPath.row]
    }

    return cell!

}
func updateSearchResults(for searchController: UISearchController) {
    self.filteredInvestments.removeAll(keepingCapacity: false)
   let searchPredicate = NSPredicate(format: "SELF CONTAINS[c] %@", searchController.searchBar.text!)
  let array  = (self.filteredInvestments as NSArray).filtered(using: searchPredicate)
    self.filteredInvestments = array as! [String]
    self.tableView.reloadData()



}

}

好的，这样就有了 PickerView 和 Search 视图的代码。 *没有编译错误，应用程序运行。我将它连接到我的 iPhone 5c 并且能够很好地运行该应用程序。

以下是应用运行的一些图片。 （有未填充的视图）

这里是图片的链接（因为我没有 10 的声望） http://imgur.com/a/0Gp4P - PickerView http://imgur.com/a/JiUFe - UISearch

非常感谢你能回答这个问题，因为我浏览了网络，大多数时候几乎没有帮助，而那些有帮助的人却什么也没做。总而言之，当我运行它时，我放入数组中的字符串都没有显示出来。

非常感谢你们！

Answer 1

对于您的 UIPickerView，您忘记了功能：

 func pickerView(_ pickerView: UIPickerView, viewForRow row: Int,     forComponent component: Int, reusing view: UIView?) -> UIView 
{
 let pickerLabel = UILabel() //Create label
 pickerLabel.textColor = UIColor.black //Create text color
 pickerLabel.text = pickerData[row] //Make text for row the one in array
 pickerLabel.font = UIFont(name: "Helvetica-Light", size: 20) //Text font
 pickerLabel.textAlignment = NSTextAlignment.center //Alignment
 return pickerLabel
}

至于搜索，使用与上面类似的功能，只是没有选择器视图，它将用于搜索视图。自动完成应该有助于找到它。