无法将&#39;NSRange&#39;（又名&#39;_NSRange&#39;）类型的值转换为预期类型&#39;Range <Index> &#39;（又名&#39;范围 <String.CharacterView.Index> “）

Question

检查字符串字符的范围时出现此错误...

@objc func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
    let shouldChange = false
    let text = textField.text
    var newString = text!.stringByReplacingCharactersInRange(range, withString: string) as? NSString
    if newString.length > 14{
        newString = newString.substringToIndex(14)
    }
    textField.text = newString.uppercaseString

    return shouldChange
}

Answer 1

而不是text! 说(text! as NSString) 。

var newString = (text! as NSString).stringByReplacingCharactersInRange(range, withString: string) as? NSString

Answer 2

斯威夫特4

func textField(_ textField: UITextField,
               shouldChangeCharactersIn range: NSRange,
               replacementString string: String) -> Bool {

    if let oldString = textField.text {
        let newString = oldString.replacingCharacters(in: Range(range, in: oldString)!,
                                                      with: string)
        // ...
    }
    // ...
}