我试图将随机数据存储到第二个数组中

Question

我正在尝试将随机生成的数据存储到第二个数组中，这样我就可以按一个按钮返回它。此刻我按回去，那里什么都没有。我认为这是由于项目没有正确存储在第二个数组中。我将提供代码供参考。任何帮助将不胜感激！

var randomGeneratedQuotes = Array <String>()
var currentlyShown : String?
var randomQuote: String {
    let randomNumber = Int(arc4random_uniform(UInt32(myQuotes.count)))
    return myQuotes[randomNumber]

}

var previousRandom: String? {

    if currentlyShown == randomQuote {
        let previous = randomGeneratedQuotes.index(of: currentlyShown!)! - 1
        return randomGeneratedQuotes[previous]
    }

    return randomGeneratedQuotes.last
}




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

    var randomQuote: String {
        let randomNumber = Int(arc4random_uniform(UInt32(myQuotes.count)))
        return myQuotes[randomNumber]

    }

    func storePrevious() {
        if randomGeneratedQuotes.contains(randomQuote) {return}
        randomGeneratedQuotes.append(randomQuote)
    }

    quotesLabel.text = randomQuote


}

//right hand button tapped

@IBAction func RHSButton(_ sender: Any) {

    var randomQuote: String {
        let randomNumber = Int(arc4random_uniform(UInt32(myQuotes.count)))
        return myQuotes[randomNumber]


    }

    func storePrevious() {
        if randomGeneratedQuotes.contains(randomQuote) {return}
        randomGeneratedQuotes.append(randomQuote)
    }
    quotesLabel.text = randomQuote


}

//left hand button tapped

@IBAction func LHSButton(_ sender: Any) {


    func pressedBack() {
        currentlyShown = previousRandom


    }

    quotesLabel.text = previousRandom
}