Swift - 动态数组和改变视图

Posted 2023-02-26

【中文标题】Swift - 动态数组和改变视图

【英文标题】：Swift - dynamic array and changing the views

【发布时间】：2014-12-10 11:16:14

【问题描述】：

让我开始解释我刚刚开始从事我的第一个项目。该项目是一个非常简单的流行词类游戏，虽然有名人姓名 - 用户将名人姓名添加到数组中，然后使用开始按钮，名人标签会在数组中发生变化。

在编写代码时，我遇到了一个错误：当我切换视图（从添加名人到播放）时，在添加名人中定义的整个数组都消失了。我调查了这个问题，结果发现，每当我从 Add Celebrity 视图更改视图时，数组就会消失。

这是我的代码：

@IBOutlet var addCelebrityText: UITextField!
@IBOutlet var numberOfPlayers: UITextField!
@IBOutlet var numberOfCelebrities: UITextField!
@IBOutlet var timeSet: UITextField!
@IBOutlet var timerField: UILabel!
@IBOutlet var celebField: UILabel!
@IBAction func scoreButton(sender: AnyObject) 

    println(celebrityName)
     
@IBOutlet var startButtonField: UIButton!
@IBAction func startButton(sender: AnyObject) 
    shuffle(&celebrityName)
    celebField.text = "\(celebrityName[1])"
    startGame();



@IBAction func saveSettingsButton(sender: AnyObject) 

@IBAction func test(sender: AnyObject) 
    shuffle(&celebrityName)
    println(celebrityName)

@IBAction func addCelebrityButton(sender: AnyObject) 
    if addCelebrityText.text.isEmpty 

        let emptyAlert = UIAlertController(title: "No name celebrity", message: "You have to write down  name of the celebrity", preferredStyle: UIAlertControllerStyle.Alert)

        emptyAlert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: nil))

        self.presentViewController(emptyAlert, animated: true, completion: nil)

    

    else 

        let confirmAlert = UIAlertController(title: "Confirm", message: "Are you sure you want to add \(addCelebrityText.text) into the game?" , preferredStyle: .Alert)

        confirmAlert.addAction(UIAlertAction(title:"Yes", style: UIAlertActionStyle.Default, handler: (confirmAction)-> Void in self.addCelebrity(); println("\(self.addCelebrityText.text) added into the database")))

        confirmAlert.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: nil))


        presentViewController(confirmAlert, animated: true, completion: nil)




    



var celebrityName = [String]()

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


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


override func touchesBegan(touches: NSSet, withEvent event: UIEvent) 
    self.view.endEditing(true)


func addCelebrity() 

    celebrityName.append(addCelebrityText.text)





var startTime = NSTimeInterval()
var timer = NSTimer()
var gameTime:Double = 60




func startGame() 
    startButtonField.setTitle("PAUSE", forState: .Normal)
    let aSelector : Selector = "updateTime"
    timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: aSelector, userInfo: nil, repeats: true)
    startTime = NSDate.timeIntervalSinceReferenceDate()



func updateTime() 
    var currentTime = NSDate.timeIntervalSinceReferenceDate()
    var elapsedTime = currentTime - startTime
    var seconds = gameTime-elapsedTime
    if seconds > 0 
        elapsedTime -= NSTimeInterval(seconds)
        println("\(Int(seconds))")
        timerField.text = "\(Int(seconds))"
     else 
        timer.invalidate()
        startButtonField.setTitle("START", forState: .Normal)
    


func shuffle<C: MutableCollectionType where C.Index == Int>(inout list: C) 
    let count = countElements(list)
    for i in 0..<(count - 1) 
        let j = Int(arc4random_uniform(UInt32(count - i))) + i
        swap(&list[i], &list[j])
    

【参考方案1】：

您最好使用单例类声明的数组，以便保留数组中的值。