不等号不能在swift中工作

Question

卡片相等时分数会增加，这是我想要的，但卡片不相等时也会增加。我尝试了使用不等号但仍然没有任何运气。

@IBAction func SnapButtonTapped(sender: UIButton) { 

    if firstRandomNumber == SecondRandomNumber { 

     print("index match") 

     self.playerScore += 1 
     self.playerScoreLabel.text = String(self.playerScore) 


    } 

    else if firstRandomNumber != SecondRandomNumber { 

     print("no match") 


    } 
    //get the audioPlayer that correspond to the button that they tapped 
    let audioPlayer = audioPlayers[sender.tag] 
    audioPlayer.play() 
} 

这是我的代码的其余部分。

import UIKit 
import AVFoundation 

let firstRandomNumber = Int() 
let SecondRandomNumber = Int() 
let firstCardString = String() 
let SecondCardString = String() 

class ViewController: UIViewController { 

@IBOutlet weak var FirstCardImageView: UIImageView! 
@IBOutlet weak var SecondCardImageView: UIImageView! 
@IBOutlet weak var PlayRoundButton: UIButton! 
@IBOutlet weak var BackgroundImageView: UIImageView! 
@IBOutlet weak var playerScoreLabel: UILabel! 

let soundFilenames = ["shuffle", "correct"] 
var audioPlayers = [AVAudioPlayer]() 



var playerScore: Int = 0 

var cardNamesArray: [String] = ["sad", "sleepy","angry"] 

var cardNamesArray2: [String] = ["triste", "cansado","enfadado"] 


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

    //set up audio player 
    for sound in soundFilenames { 

     do { 
      //try to do something 

      let url = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource(sound, ofType:"wav")!) 
      let audioPlayer = try AVAudioPlayer(contentsOfURL: url) 

      audioPlayers.append(audioPlayer) 

     } 
     catch { 

      //catch the error 
      audioPlayers.append(AVAudioPlayer()) 

     } 



    } 

    self.PlayRoundButton.setTitle("Play", forState: UIControlState.Normal) 
} 

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



@IBAction func playRoundTapped(sender: UIButton) { 

    self.PlayRoundButton.setTitle("Shuffle Cards", forState: UIControlState.Normal) 

    //First Card generate random number 
    let firstRandomNumber = Int (arc4random_uniform(3)) 
    let firstCardString:String = self.cardNamesArray[firstRandomNumber] 
    self.FirstCardImageView.image = UIImage(named: firstCardString) 

    //Second Card generate random number 
    let SecondRandomNumber = Int (arc4random_uniform(3)) 
    let SecondCardString:String = self.cardNamesArray2[SecondRandomNumber] 
    self.SecondCardImageView.image = UIImage(named: SecondCardString) 

    //determine matching cards 

    let audioPlayer = audioPlayers[sender.tag] 
    audioPlayer.play() 

}

Answer 1

它的范围。你认为你正在设定firstRandomNumber & SecondRandomNumber（请不要使用大写字母作为变量！）到随机数字，但实际上你正在重新声明它们。删除let s在playRoundTapped并将这两个顶级声明更改为var s。