ios - 消除数字中的多个小数点(快速)

Question

我想将用户输入限制为仅有效数字并使用以下内容:

func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
    guard CharacterSet(charactersIn: " -0123456789.,\t\n").isSuperset(of: CharacterSet(charactersIn: text)) else {
        return false
    }
    return true
}

但这并不妨碍输入多于一位的小数点，例如“1.2.3”。有没有一种简单的方法可以防止这种情况发生？

Answer 1

尝试使用这个例子

guard CharacterSet(charactersIn: " -0123456789.,\t\n").isSuperset(of: CharacterSet(charactersIn: text)) else {
        return false
    }
    
    var newText = (textView.text as NSString).replacingCharacters(in: range, with: text)
    newText = newText.replacingOccurrences(of: ",", with: ".")
    
    let strings = newText.split { character -> Bool in
        return character == "\t" || character == "\n"
    }
    
    let numbers: [Double] = strings.compactMap { Double($0) }
    
    return strings.count == numbers.count