Question

我有一个名为UILabel的{{1}}，最后一个索引中的元素是我想增加的数字。 nihoshim是alpha的集合。

UIButton

错误是：

初始化器'init（_ :)'要求'String.Index'符合'BinaryInteger'

Answer 1

要获取字符串的最后一个字符，可以使用suffix()

str.suffix(1)

因此，在您的代码中，将let index = Int(liel.endIndex)替换为

guard let index = Int(liel.suffix(1)) else {
    return //or some error handling
}

Answer 2

您不能仅将String.Index转换为数字。

如果我们谈论的是endIndex，最简单的方法是：

let index = liel.count

对于其他索引，这将是：

let string = "abcd"
let stringIndex: String.Index = string.endIndex
let index: Int = string.distance(from: string.startIndex, to: stringIndex)

Answer 3

正如Sulthan所说，您可以使用距离如下所示

@IBAction func wordChoser(_ sender: UIButton) {
        guard let liel = nihoshim.text, let morning = gameLabel.text else {
            return
        }
        let tag: Int = sender.tag - 1
        let index: Int = liel.distance(from: liel.startIndex, to: liel.endIndex)
        var alephbet = ["א","ב","ג","ד","ה","ו","ז","ח","ט","י","כ","ל","מ","נ","ס","ע","פ","צ","ק","ר","ש","ת"]
        if morning.count <= 3 {
            gameLabel.text = morning + alephbet[tag]
            gameLabel.text = morning + "\(index + tag)"
            sender.isHidden = true
        }
    }

将String索引转换为Int

3 个答案: