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ios - 每次按下按钮时随机显示文件中的元素

问题描述

所以我有这个超过600字的大文件。我将它们添加到我的数组中，现在我需要在标签上随机显示它们。每次按下按钮时，都必须显示新的随机词，直到计时器结束。我已经搜索了这个问题的多个来源，但无法应用它们，因为我是新手

import UIKit

class ViewController: UIViewController {
    
    var wordArray: [String] = []
    var i: Int = 0
    var timer = Timer()
    var totalSecond = 5
    func startTimer() {
         timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(updateTime), userInfo: nil, repeats: true)
     }

     @objc func updateTime() {

        
          if totalSecond != 0 {
             totalSecond -= 1
            timerLabel.text = "\(totalSecond) seconds left"
          } else {
             endTimer()
          }

      }

      func endTimer() {
          timer.invalidate()
      }

      func timeFormatted(_ totalSeconds: Int) -> String {
          let seconds: Int = totalSeconds % 60
          return String(format: "0:%02d", seconds)
      }

    @IBOutlet weak var timerLabel: UILabel!
    
    @IBOutlet weak var showWordLabel: UILabel!
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        let url = Bundle.main.url(forResource: "english_words", withExtension: "txt")!
                do {
                    let string = try String(contentsOf: url, encoding: .utf8)
                    wordArray = string.components(separatedBy: CharacterSet.newlines)
                } catch {
                    print(error)
                }
        startTimer()
    }

    
    @IBAction func nextBtn(_ sender: UIButton) {
        
    }
}

标签： iosswift

解决方案

虽然我不是 100% 确定我理解你的问题，但这里是你的 viewController 的修改版本。

请参阅代码中的注释。

class ViewController: UIViewController {
    
    var wordArray: [String] = []
    var i: Int = 0
    var timer = Timer()
    var totalSecond = 5
    func startTimer() {
        // Stop old timer
        timer.invalidate()
        
        // Start new timer
        timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(updateTime), userInfo: nil, repeats: true)
    }
    
    @objc func updateTime() {
        if totalSecond != 0 {
            totalSecond -= 1
            timerLabel.text = "\(totalSecond) seconds left"
        } else {
            endTimer()
        }
    }
    
    func endTimer() {
        timer.invalidate()
    }
    
    func timeFormatted(_ totalSeconds: Int) -> String {
        let seconds: Int = totalSeconds % 60
        return String(format: "0:%02d", seconds)
    }
    
    @IBOutlet weak var timerLabel: UILabel!
    
    @IBOutlet weak var showWordLabel: UILabel!
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        let url = Bundle.main.url(forResource: "english_words", withExtension: "txt")!
        do {
            let string = try String(contentsOf: url, encoding: .utf8)
            wordArray = string.components(separatedBy: CharacterSet.newlines)
        } catch {
            print(error)
        }
        startTimer()
    }
    
    
    @IBAction func nextBtn(_ sender: UIButton) {
        // Fetch random Word from array
        let randomValue = Int.random(in: 0..<wordArray.count)
        let randomWord = wordArray[randomValue]
        
        // Assign to label
        showWordLabel.text = randomWord
        
        // Restart timer
        startTimer()
    }
}

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