如何将数据传递到下一个表视图？

Question

所以我有一个存储密钥与多个值的字典。我有两个视图控制器，都包含一个表视图和自定义单元格。

我已将键放入数组中，并将它们分配给第一个视图控制器中单元格标签的文本。当转换到下一个视图控制器时，我想传递按下的键的值。因此，例如，如果在第一个视图控制器中选择了包含字典中第一个键的行，则第一个键的所有值都将被分配给以下视图控制器的单元格标签文本，等等。这是可能的，如果是的话，那么实现这个的最好方法是什么？

这里是我的第一个视图控制器代码：

import UIKit 

var trainingDict = ["Ball Handling" : ["1 Ball Stationary Drills", "1 Ball Combo Moves", "2 Ball Stationary Drills", "2 Ball Combo Moves", "2 Ball Partner Drills", "Handle Hoop Drills"], "Shooting" : ["Form Shooting", "Spot Shooting", "Off The Dribble Shots", "Pull Up Jumpshots", "Catch & Shoots", "Free Throws", "Partner Shooting"], "Defense" : ["5 Star Drill", "Full Court Def. Slides", "1 v 1 Closeouts", "Gauntlet Drill", "Tennis Ball Reaction Drill", "Lane Slides"], "Advanced Drills" : ["D Man Series", "Iso Series", "Double Move Series", "Gauntlet Series", "John Wall Drill", "Floater Series"], "Vertimax Drills" : ["One Foot Jumps", "Box Jumps", "Resitance Slides", "Resistance Jumps", "Resistance Ball Handling", "Vertimax Sprints", "Slam Drill"], "Full Workouts" : ["Workout A", "Workout B", "Workout C", "Workout D", "Workuot E", "Workout F", "Workout G"], "BHB Products" : ["Handle Hoops", "Handle Cubes", "Strech Bands", "Advocare"]] 
var gradient : CAGradientLayer! 
var myIndex = 0 


class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource { 



@IBOutlet weak var tableView: TableView! 

var trainingCategories = [String]() 
var arrayForKey = [String]() 
var selectedKey = String() 




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

    return trainingDict.count 
} 




public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
{ 
    let cell = tableView.dequeueReusableCell(withIdentifier: "bell" , for: indexPath) as! ViewControllerTableViewCell 
    cell.tag = indexPath.row 




    //cell details 
    cell.backgroundColor = UIColor.clear 

    //gradient details 
    gradient = CAGradientLayer() 
    gradient.frame = tableView.bounds 
    gradient.colors = [UIColor.black.cgColor, UIColor.darkGray.cgColor, UIColor.black.cgColor] 
    tableView.layer.insertSublayer(gradient, at: 0) 
    gradient.startPoint = CGPoint(x: 0.0, y: 0.0) 
    gradient.endPoint = CGPoint(x: 1.0, y: 1.0) 

    //details what the text label of cell displays 
    var trainingCategories = Array(trainingDict.keys) 
    trainingCategories.sort { return $0 < $1} 
    cell.textLabel?.text = trainingCategories[indexPath.row] 
    cell.textLabel?.textColor = UIColor.white 

    return cell 
} 


func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { 
    myIndex = indexPath.row 
    selectedKey = trainingCategories[indexPath.row] 
    performSegue(withIdentifier: "segue", sender: self) 

} 

override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
    if segue.identifier == "segue" { 
     if let secondTableView = segue.destination as? DrillsViewController { 

      //get array for selected key 
      arrayForKey = trainingDict[selectedKey]! 

      //pass to second table view 
      secondTableView.arrayForKey2 = arrayForKey 
      } 
     } 


    } 



override func viewDidLoad() { 
    super.viewDidLoad() 
    tableView.delegate = self 
    tableView.dataSource = self 
    var trainingCategories = Array(trainingDict.keys) 
    trainingCategories.sort { return $0 < $1} 
} 

下面是第一控制器塞格斯到第二视图控制器代码：

import UIKit 



import UIKit 



class DrillsViewController: UIViewController, UITableViewDelegate, UITableViewDataSource { 

var arrayForKey2 = [String]() 

@IBOutlet weak var tableView: DrillsTableView! 

@IBOutlet weak var drillLabel: UILabel! 


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

    return arrayForKey2.count 
} 

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

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

    //clear background color needed in order to display gradient cell 
    cell.backgroundColor = UIColor.clear 

    //gradient configuration 
    gradient = CAGradientLayer() 
    gradient.frame = tableView.bounds 
    gradient.colors = [UIColor.black.cgColor, UIColor.darkGray.cgColor, UIColor.black.cgColor] 
    tableView.layer.insertSublayer(gradient, at: 0) 
    gradient.startPoint = CGPoint(x: 0.0, y: 0.0) 
    gradient.endPoint = CGPoint(x: 1.0, y: 1.0) 



    //attributes for watch/play button 
    cell.playButton.layer.shadowColor = UIColor.yellow.cgColor 
    cell.playButton.layer.shadowOffset = CGSize(width: 2, height: 2) 
    cell.playButton.layer.shadowOpacity = 0.7 
    cell.playButton.layer.shadowRadius = 1 

    //details for cell label display 

    cell.drillTitle.text = "\(arrayForKey2[indexPath.row])" 


    return cell 
} 




override func viewDidLoad() { 
    super.viewDidLoad() 
    tableView.delegate = self 
    tableView.dataSource = self 

     } 

Answer 1

我建议在上面声明3个变量表视图1：

1. var trainingCategories: [String]?拿你的字典键
2. var arrayForKey: [String]?从字典
3. var selectedKey: String?保持适当的数组来保存所选择的字典键

另外创建在表视图2中的变量来保存的dict阵列你会通过从表图。例如var arrayForKey2: [String]?

将以下内容放在表格视图1的viewDidLoad方法中，并从CellForRowAt中删除。这将停止每次在每个可重用单元上调用CellForRowAt时调用它。呼唤你的self.performSegue...方法之前selectedKey = trainingCategories[indexPath.row]：

trainingCategories = Array(trainingDict.keys) 
    trainingCategories?.sort { return $0 < $1} 

在didSelectRowAt，获得所选择的字典键。

最后覆盖表视图1您prepareForSegue方法，将信息传递给表视图2：

override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
    if segue.identifier == "segue" { 
     secondTableView = segue.destination as! DrillsViewController 
     //Get array for selected dictionary key 
     arrayForKey = trainingDict[selectedKey] 
     //Pass to second table view 
     secondTableView.arrayForKey2 = arrayForKey 
    } 
} 

在cellForRowAt表视图，然后你可以设置单元格的标签如前。例如。 cell.textLabel?.text = "\(arrayForKey2[indexPath.row])"

更新程序可以修复：

• 下仍然在表视图1.请删除的cellForRowAt存在。

  var trainingCategories = Array(trainingDict.keys) 
  trainingCategories.sort { return $0 < $1} 
  

• 在表视图1的viewDidLoad，在下面的行开始之前除去var。

var trainingCategories = Array(trainingDict.keys)