重構后閉包內的函式未使用-有解無憂

我正在提取方法的閉包，但我總是收到此錯誤：

功能未使用

這是整個作業功能：

        fileprivate func attemptToChangePassword() {
    
    passwordChanger.change(securityToken: securityToken, oldPassword: oldPassword.text ?? "", newPassword: newPassword.text ?? "", onSuccess:{[weak self] in
        self?.hideSpinner()
        let alertController = UIAlertController(
            title: nil,
            message: "Your password has been successfully changed.",
            preferredStyle: .alert)
        let okButton = UIAlertAction(
            title: "OK",
            style: .default) { [weak self] _ in
                self?.dismiss(animated: true)
            }
        alertController.addAction(okButton)
        alertController.preferredAction = okButton
        self?.present(alertController, animated: true)
        
    }, onFailure: {[weak self] message in
        self?.hideSpinner()
        self?.showAlert(message: message) { [weak self] _ in
            self?.oldPassword.text = ""
            self?.newPassword.text = ""
            self?.confirmPassword.text = ""
            self?.oldPassword.becomeFirstResponder()
            self?.view.backgroundColor = .white
            self?.blurView.removeFromSuperview()
            self?.cancel.isEnabled = true
        }
            
    })
}

這就是我將最后一個閉包提取到方法的方式：

fileprivate func startOver() -> (UIAlertAction) -> Void {
    return { [weak self] _ in
        self?.oldPassword.text = ""
        self?.newPassword.text = ""
        self?.confirmPassword.text = ""
        self?.oldPassword.becomeFirstResponder()
        self?.view.backgroundColor = .white
        self?.blurView.removeFromSuperview()
        self?.cancel.isEnabled = true
    }
}

如果我嘗試這樣做，則會出現錯誤“函式未使用”：

  onFailure: { [weak self] message in
 self?.hideSpinner()
 self?.showAlert(message: message) { [weak self] _ in
  self?.startOver()//FUNCTION IS UNUSED
  }
 })

編輯：

這是使用的警報方法：

      fileprivate func showAlert( message: String, okAction: @escaping (UIAlertAction) -> Void) {
    let ac = UIAlertController(title: nil, message: message, preferredStyle: .alert)
    let ok = UIAlertAction(title: "OK", style: .default, handler:okAction)
    ac.addAction(ok)
    ac.preferredAction = ok
    self.present(ac, animated: true)
}

如果我添加回警報操作按鈕，它可以作業：

let okButton = UIAlertAction(
            title: "OK",
            style: .default,
            handler:startOver())

uj5u.com熱心網友回復：

您當前在傳遞給函式的操作中呼叫該函式，showAlert然后丟棄它回傳的操作。相反，您希望將它回傳的操作直接傳遞給您的showAlert方法，而不是使用尾隨閉包語法將其包裝在另一個操作中：

self?.showAlert(message: message, okAction: self!.startOver())

轉載請註明出處，本文鏈接：https://www.uj5u.com/yidong/441310.html

標籤：迅速自动重构

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