ios - 如何在每次单击按钮时更改标签文本上的 int 值

Question

//这是我还在字符串中使用颜色标签的代码

var cellIndex: Int = 0
override func viewDidLoad() {
    super.viewDidLoad()
    cellIndex = 1
    let s1 = "word \(cellIndex) to \(cellIndex+7)"
    let mystring:NSString = "\(s1) recovery phrases" as NSString
    var myMutableString = NSMutableAttributedString()
    myMutableString =  NSMutableAttributedString(string:mystring as String, attributes: [NSAttributedString.Key.font:Font.mediumRegularFont()])
    myMutableString.addAttribute(NSAttributedString.Key.foregroundColor, value: Color.darkColor(), range: NSRange(location:0,length:s1.count))
    stepBarView.attributedText = myMutableString
}
@IBAction func onNextButtonTap(_ sender: Any) {
    // i want to change cellIndex Value every time when i press button.
}

Answer 1

你有2个选择

1 将值替换为replacingOccurrences，但需要考虑该数字可能有多少位数字。2 再次重新创建整个字符串，这样更快、更少工作