swift - 将数据从 TableViewCell 标签传递到 ViewController

Question

项目:https://github.com/vpags1/events.git

我需要将数据从 TableView 传递到 ViewController。数据显示在带有两个标签和 UIIMage(名称、详细信息、照片)的单元格上，单击该标签会将您带到另一个详细信息 View Controller ，该 Controller 显示信息。

我现在的情况是，数据存储在 View Controller 中的三个数组中，但是当我与教授交谈时，他告诉我，最简单的方法是将数据存储在单独的文件中。我真的不知道如何实现这一点，无论是方式还是其他方法，我都将不胜感激。

import UIKit

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

    var names = ["Brown Diner", "Kirkland", "Choco", "Lil Wayne", "Annie", "Social"]
    var details = ["Free drink with meal after 12 AM", "LADIES drink free", "10% off all ice cream!", "concert", "a Theater Production", "Bring your Squad to the Social"]
    var images = [UIImage(named: "brown"), UIImage(named: "kirk"), UIImage(named: "choco"), UIImage(named: "lilwayne"), UIImage(named: "default"), UIImage(named: "default")]

    override func viewDidLoad() {
    super.viewDidLoad()
}

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = self.eventsTable.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! CustomCell

    cell.name.text = names[indexPath.row]
    cell.detail.text = details[indexPath.row]
    cell.photo.image = images[indexPath.row]
    return cell
}

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.names.count
    }
//    
//    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
//        
//        if segue.identifier == "detailsSegue" {
//            guard let eventVC = segue.destinationViewController as? DetailsViewController,
//                let eventIndex = tableView.indexPathForSelectedRow?.row else {
//                    return
//            }
//            eventVC.eventName = names[eventIndex]
//            eventVC.eventDetail = details[eventIndex]
//            eventVC.eventPhoto = images[eventIndex]
//        }
//        
//    }
}

我的详细信息ViewController

import UIKit

class DetailsViewController : UIViewController {

    @IBOutlet var detailsLabel: UILabel!
    @IBOutlet var detailsImage: UIImageView!
    @IBOutlet var detailsDesc: UILabel!

    override func viewDidLoad() {

    }
}

我的 CustomCell.swift 文件

import UIKit

class CustomCell: UITableViewCell {

    @IBOutlet var photo: UIImageView!
    @IBOutlet var name: UILabel!
    @IBOutlet var detail: UILabel!

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

    override func setSelected(selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }

}

我对 Swift 非常陌生，事实证明它对我来说非常具有挑战性。我确实不是编码员，但是项目要求我完成我作为 UI/UIX 设计师的应用程序的一些编码。提前感谢您的帮助!

Answer 1

您可以使用数组中的数据创建一个 JSON 文件并将其添加到您的项目中:

{
    "events":[
              {
              "name": "BTown Diner",
              "details": "Free drink with meal after 12 AM",
              "image": "btown"
              },
              {
              "name": "Dunnkirk",
              "details": "LADIES drink free",
              "image": "dunn"
              },
              {
              "name": "Chocolate Mousse",
              "details": "10% off all ice cream!",
              "image": "choco"
              },
              {
              "name": "Lil Wayne",
              "details": "Lil 500 concert",
              "image": "lilwayne"
              },
              {
              "name": "Annie",
              "details": "an IU Theater Production",
              "image": "default"
              },
              {
              "name": "Campus Squad Social",
              "details": "Bring your Squad to the Campus Squad Social",
              "image": "default"
              },
              ]
}

创建一个 Event 类来封装单个事件的数据:

import UIKit

class Event {

    let name: String!
    let details:String!
    let image: UIImage!

    init(eventData: [String: String])
    {
        self.name = eventData["name"]
        self.details = eventData["details"]
        self.image = UIImage(named: eventData["image"]!)
    }
}

将事件类型的属性添加到您的DetailsViewController:

import UIKit

class DetailsViewController : UIViewController {

    // To get the event from the main view controller
    var event: Event!


    @IBOutlet var detailsLabel: UILabel!
    @IBOutlet var detailsImage: UIImageView!
    @IBOutlet var detailsDesc: UILabel!

    override func viewDidLoad() {

        detailsLabel.text = event.name
        detailsDesc.text = event.details
        detailsImage.image = event.image
    }
}

将类事件数组添加到主 ViewController读取 ViewDidLoad 中的 JSON 数据并填充您的 events 数组实现prepareForSegue并使用所选事件设置DetailsViewController的event属性。

import UIKit

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

    @IBOutlet var tableView: UITableView!

    // Created an Event class to store the event data 
    // Moved the hard coded data to Events.json
    var events = [Event]()

    override func viewDidLoad() {
        super.viewDidLoad()

        // Read the JSON data from main bundle
        if let path = NSBundle.mainBundle().pathForResource("Events", ofType: "json") {
            do {
                let jsonData = try NSData(contentsOfFile: path, options: NSDataReadingOptions.DataReadingMappedIfSafe)
                let parsedData = parseJSON(jsonData); // parse data to Swift dictionary
                print(parsedData)
                if let result = parsedData.result where parsedData.error == nil {

                    if let eventsData = result["events"] as? [[String : String]]  {

                        for event in eventsData {

                            events.append(Event(eventData: event)) // Create an event from JSON data and add to the list
                        }
                    }

                }
            } catch {}
        }
    }

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

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = self.tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! CustomCell

        cell.name.text = events[indexPath.row].name
        cell.detail.text = events[indexPath.row].details
        cell.photo.image = events[indexPath.row].image

        return cell
    }

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

                if segue.identifier == "detailsSegue" {
                    guard let eventVC = segue.destinationViewController as? DetailsViewController,
                        let eventIndex = tableView.indexPathForSelectedRow?.row else {
                            return
                    }
                    // set the event to detail view controller
                   eventVC.event = events[eventIndex]

                }
    }

    // Standard JSON parsing code
    func parseJSON(data: NSData) -> (result: [String : AnyObject]?, error: NSError?) {

        var parsingError: NSError? = nil
        let parsedResult: [String : AnyObject]?
        do {

            parsedResult = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.AllowFragments) as? [String : AnyObject]
        } catch let error as NSError {

            parsingError = error
            parsedResult = nil
        }
        return (parsedResult, parsingError)
    }
}

希望这有帮助!