arrays - Swift:为什么在使用追加时没有元素添加到我的数组中？

Question

我想创建一个斐波那契数列。用户将输入一个数字，例如 9，然后将显示斐波那契数列，以最接近的斐波那契数列结束。所以，在这种情况下:0,1,1,2,3,5,8

我在二维数组中存储元素时遇到问题。当循环从0开始时，存储索引0处的0，当循环到1时，再次存储索引0处的1，但它应该存储在索引1处。这导致上部出现索引超出范围错误的代码。我应该使用不同于追加的东西还是其他东西？

 func fabino(until: Int) {

    if until > 2 {
        for number in 0...until {

            var arrayOfDemoNumbers = [Int]()

            if number > 1 {
               arrayOfDemoNumbers.append(arrayOfDemoNumbers[number - 1] + arrayOfDemoNumbers[number - 2])
                listOfNumbers = listOfNumbers + "\(arrayOfDemoNumbers[number]), "
            }else{
                sum = number + sum
                arrayOfDemoNumbers.append(sum)
               // arrayOfDemoNumbers[number] = sum
                listOfNumbers = listOfNumbers + "\(sum), "
                dump(arrayOfDemoNumbers)
            }
        }}else{
            self.listOfNumbers = "0,1,1"
        }

        labelToChange.text = listOfNumbers

    }

Answer 1

 func fabino(until: Int) {
    var arrayOfDemoNumbers = [Int]()

    if until > 2 {
        for number in 0...until {

            if number > 1 {
               arrayOfDemoNumbers.append(arrayOfDemoNumbers[number - 1] + arrayOfDemoNumbers[number - 2])
                listOfNumbers = listOfNumbers + "\(arrayOfDemoNumbers[number]), "
            }else{
                sum = number + sum
                arrayOfDemoNumbers.append(sum)
               // arrayOfDemoNumbers[number] = sum
                listOfNumbers = listOfNumbers + "\(sum), "
                dump(arrayOfDemoNumbers)
            }
        }}else{
            self.listOfNumbers = "0,1,1"
        }

        labelToChange.text = listOfNumbers

    }