ios - pattern.firstMatch 得到错误 : Expression type '@lvalue String?' is ambiguous without more context

Question

我是第一个 iPhone 开发者。我想要做的是区分文本字段中的特殊字符。所以我尝试使用正则表达式。但它向我显示了错误。

    @IBOutlet weak var walletNameField: UITextField!

    @IBAction func nextButtonFuc(_ sender: UIButton) {
        let pattern = try! NSRegularExpression(pattern: "^[a-zA-Z0-9가-힣ㄱ-하-ㅣ\\s]$", options: .caseInsensitive)
        if walletNameField.text!.isEmpty {
            callAlert("test")
        } else if walletPasswordField.text!.isEmpty {
            callAlert("test")
        } else if confirmField.text!.isEmpty {
            callAlert("test")
        } else if walletPasswordField.text != confirmField.text {
            callAlert("test")
        } else if walletNameField.text!.count > 10 {
            callAlert("test")
        } else if walletPasswordField.text!.count  < 8 ||
            walletPasswordField.text!.count >= 20 {
            callAlert("test")
        } else if pattern.firstMatch(in: "\(walletNameField.text!)", options: NSRegularExpression.MatchingOptions.reportCompletion, range: NSMakeRange(0, walletNameField.text!.count)) { //get Error Expression type '@lvalue String?' is ambiguous without more context
            callAlert("test")
        }
    }

错误是

Expression type '@lvalue String?' is ambiguous without more context

我做错了什么？我觉得很难解决这个问题。

当我触摸任何地方时，我会尽量隐藏我的键盘。但是，函数本身是错误的。为什么会出错？

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        self.view.endEditing(true)
    }

// Error is  Declaration 'touchesBegan(touches:withEvent:)' has different argument labels from any potential overrides

提前致谢

Answer 1

您需要将 firstMatch 与一个值进行比较，因为 if 需要一个 BOOL

} else if pattern.firstMatch(in: "\(walletNameField.text!)", options: NSRegularExpression.MatchingOptions.reportCompletion,range: NSRange(location:0,length:walletNameField.text!.count)) != nil  {  

}

或者使用if let

} else if let first =  pattern.firstMatch(in: "\(walletNameField.text!)", options: NSRegularExpression.MatchingOptions.reportCompletion,range: NSRange(location:0,length:walletNameField.text!.count))  {  
   print(first)
}

---

重新升级 touchesBegan 你需要使用最新的语法 Here

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    self.view.endEditing(true)
}