swift - textLabel?.text 仅显示“标签”，但不显示从先前表视图传递的实际数据

Question

我想要实现的目标：我想单击我的第一个视图控制器中的一行以移动到另一个表视图控制器。

问题：当我单击该行时，视图只显示“标签”而不是我打算通过的数据。如果应用程序没有崩溃并且带有“标签”标题的白色背景出现，数据仍然没有显示在第二个视图控制器上。

到目前为止我所做的：我使用了 Struct: PageTwoItems 来定义我想要发送到第二个视图控制器的数据。

import Foundation
import UIKit

第二个视图控制器的代码如下：

class PageTwoTableViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
@IBOutlet weak var tableView: UITableView!

var PageTwo = [String]()

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

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

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

   Cell.textLabel?.text = PageTwo[indexPath.row]

    return Cell
}

}

第一个视图控制器的代码如下：

@IBOutlet weak var tableView: UITableView!

let names = ["Cleaning", "Plumbing","Electrical", "Craftswork", "Automotive"]

let desc = ["Get your spotless home or office space", "Drains, Pipes, Faucets and more", "Lighting, Fans, AC's and more", "Installation, Assembly and more", "Tow Truck Hire, Tyre Replacement and more"]
let images = [UIImage(named:"pug"),UIImage(named:"pug2"),UIImage(named:"pug3"),UIImage(named:"pug4"),UIImage(named:"pug5")]

var PageTwo = [PageTwoItems]()


override func viewDidLoad() {

    PageTwo = [PageTwoItems(nametwo:["Home Cleaning", "Office Cleaning", "Moving In/Out Cleaning"], summarytwo:["Let your home sparkle","Office space cleaning right at your fingertips","New Home or Old Home? We've got you covered"],phototwo:["","",""]),
        PageTwoItems(nametwo:["Drains, Pipes & Faucets", "Showers and Bath Tubs", "Toilet and Wash Basin", "Water Heater"], summarytwo:["Fix Your Broken Pipes, Clogged Drains and Leaky Faucets","Showers and Bath Tubs working just right"," ", " "],phototwo:["","",""]),
        PageTwoItems(nametwo:["Lighting Fixtures", "Air Conditioners & Fans", "Generators"], summarytwo:["..","..",".."],phototwo:["","",""]),
        PageTwoItems(nametwo:["Furniture Assembly/Installation", "Interior Painting", "Doors, Windows & Curtains"], summarytwo:["..","...","..."],phototwo:["","",""]),
        PageTwoItems(nametwo:["Tow Truck Hire", "Tyre/Vulcanizer Help", "Auto-Consultant"], summarytwo:["...","...","..."],phototwo:["","",""])]



    super.viewDidLoad()

}

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

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    return 5

}

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

    let cell = self.tableView.dequeueReusableCellWithIdentifier("newcell", forIndexPath:indexPath) as!CustomCell

    cell.photo.image = images[indexPath.row]
    cell.summary.text = desc[indexPath.row]
    cell.name.text = names[indexPath.row]

    return cell
}

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

    let indexPath : NSIndexPath = self.tableView.indexPathForSelectedRow!

    let DestViewController = segue.destinationViewController as! PageTwoTableViewController

    var PageTwoArrayTwo : PageTwoItems

    PageTwoArrayTwo = PageTwo[indexPath.row]

    DestViewController.PageTwo = PageTwoArrayTwo.nametwo
    DestViewController.PageTwo = PageTwoArrayTwo.summarytwo
    DestViewController.PageTwo = PageTwoArrayTwo.phototwo

}

}

The struct for the Page Two Items: 

struct PageTwoItems {
    var nametwo : [String]
    var summarytwo : [String]
    var phototwo : [String]
}

Answer 1

我认为您的数据组织不正确。我认为您正在寻找的是这样的：

1. 打扫

   • 家庭清洁
   • 办公室清洁
   • ETC

2. 水暖

   • 排水管、管道和水龙头
   • 淋浴和浴缸
   • ETC

3. 电气

   • 照明灯具
   • 空调和风扇
   • 发电机

这就是我将如何创建数据结构来支持这一点。

// This represents a single row on the detail screen
struct PageTwoItem {
    var name : String
    var summary : String
    var photo : String
}
// this represents a single row on the main screen
struct PageData {
    var name: String            // goes into the table on main screen
    var subitems: [PageTwoItem] // send this to the detail
}

class MasterViewController: UITableViewController {

    var detailViewController: DetailViewController? = nil
    // Make an array of PageData
    var objects = [PageData]()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        setupData()
    }


    func setupData() {
        objects = [
            PageData(name: "Cleaning", subitems: [
                PageTwoItem(name: "Cleaning 1", summary: "", photo: ""),
                PageTwoItem(name: "Cleaning 2", summary: "", photo: ""),
                PageTwoItem(name: "Cleaning 3", summary: "", photo: ""),
                PageTwoItem(name: "Cleaning 4", summary: "", photo: "")
                ] ),
            PageData(name: "Plumbing", subitems: [] ),
            PageData(name: "Electrical", subitems: [] ),
            PageData(name: "Craftswork", subitems: [] ),
            PageData(name: "Automotive", subitems: [] ),
        ]
    }

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        print(segue.identifier)
        if segue.identifier == "showDetail" {
            if let indexPath = self.tableView.indexPathForSelectedRow {
                let object = objects[indexPath.row]
                let controller = segue.destinationViewController as! DetailViewController
                // tell the detail controller what we want her to show
                controller.detailItem = object
            }
        }
    }

    // MARK: - Table View

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 1
    }

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

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath)

        let object = objects[indexPath.row]
        cell.textLabel!.text = object.name
        return cell
    }


}

在详细控制器中：-

导入 UIKit

class DetailViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

    @IBOutlet weak var tableView: UITableView!
    // here is where we put the data we want to show
    var detailItem: PageData?

    // MARK: - Table View

    func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 1
    }

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if let detailItem = detailItem {
            print("count = \(detailItem.subitems.count)")
            return detailItem.subitems.count
        }
        return 0

    }

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

        if let object = detailItem?.subitems[indexPath.row] {
            cell.textLabel!.text = object.name
        }
        return cell
    }
}

Answer 2

我认为您使用的 segue 直接连接到 tableview 单元到您的第二个视图控制器。

您应该在 2 个控制器之间连接您的 segue，并为属性检查器设置一个标识符，如 showSecondControllerSegue 并使用此方法：

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    performSegueWithIdentifier(identifier: "showSecondControllerSegue", sender: self)
}

编辑 ：-

您的代码应该是：

对于第二个视图控制器：

class PageTwoTableViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

@IBOutlet weak var tableView: UITableView!

var pageTwo = [String]()

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

func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return 1
}

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

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

   Cell.textLabel?.text = pageTwo[indexPath.row]

    return Cell
}
}

对于第一个视图控制器：

@IBOutlet weak var tableView: UITableView!

let names = ["Cleaning", "Plumbing","Electrical", "Craftswork", "Automotive"]

let desc = ["Get your spotless home or office space", "Drains, Pipes, Faucets and more", "Lighting, Fans, AC's and more", "Installation, Assembly and more", "Tow Truck Hire, Tyre Replacement and more"]
let images = [UIImage(named:"pug"),UIImage(named:"pug2"),UIImage(named:"pug3"),UIImage(named:"pug4"),UIImage(named:"pug5")]

var pageTwo = [PageTwoItems]()


override func viewDidLoad() {
    super.viewDidLoad()

    pageTwo = [PageTwoItems(nametwo:["Home Cleaning", "Office Cleaning", "Moving In/Out Cleaning"], summarytwo:["Let your home sparkle","Office space cleaning right at your fingertips","New Home or Old Home? We've got you covered"],phototwo:["","",""]),
        PageTwoItems(nametwo:["Drains, Pipes & Faucets", "Showers and Bath Tubs", "Toilet and Wash Basin", "Water Heater"], summarytwo:["Fix Your Broken Pipes, Clogged Drains and Leaky Faucets","Showers and Bath Tubs working just right"," ", " "],phototwo:["","",""]),
        PageTwoItems(nametwo:["Lighting Fixtures", "Air Conditioners & Fans", "Generators"], summarytwo:["..","..",".."],phototwo:["","",""]),
        PageTwoItems(nametwo:["Furniture Assembly/Installation", "Interior Painting", "Doors, Windows & Curtains"], summarytwo:["..","...","..."],phototwo:["","",""]),
        PageTwoItems(nametwo:["Tow Truck Hire", "Tyre/Vulcanizer Help", "Auto-Consultant"], summarytwo:["...","...","..."],phototwo:["","",""])]    
}

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

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return 5
}

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

    let cell = self.tableView.dequeueReusableCellWithIdentifier("newcell", forIndexPath:indexPath) as!CustomCell

    cell.photo.image = images[indexPath.row]
    cell.summary.text = desc[indexPath.row]
    cell.name.text = names[indexPath.row]

    return cell
}

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    performSegueWithIdentifier(identifier: "showSecondControllerSegue", sender: self)
}

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

    let indexPath : NSIndexPath = self.tableView.indexPathForSelectedRow!

    let DestViewController = segue.destinationViewController as! PageTwoTableViewController

    var pageTwoArrayTwo : PageTwoItems

    pageTwoArrayTwo = PageTwo[indexPath.row]

    DestViewController.pageTwo = pageTwoArrayTwo.nametwo
    DestViewController.pageTwo = pageTwoArrayTwo.summarytwo
    DestViewController.pageTwo = pageTwoArrayTwo.phototwo

}