ios - 申请表中的登记表

Question

所以我的应用程序中有注册表单，但是有问题。这是我的代码:

@IBAction func registerButtonAction(sender: AnyObject) {
        if (fullnameTextField.text == ""){
            self.fullnameTextField.shake()
        }
        if (usernameTextfield.text == ""){
            self.usernameTextfield.shake()
        }
        if (usernameTextfield.text?.characters.count < 6){
            usernameTextfield.shake()
        }
        if (emailTextfield.text == ""){
            self.emailTextfield.shake()
        }
        if (passwordTextfield.text == ""){
            self.passwordTextfield.shake()
        }
        if (retypepasswordTextfield.text == ""){
            self.retypepasswordTextfield.shake()
        }
        else{
            registerButton.setTitle("Registering user...", forState: UIControlState.Normal)
            registerButton.alpha = 0.20
            registerButton.enabled = false
            registerUser()
        }
    }

首先:我能否使这段代码更小、更简单？其次，如果所有 UITextField 都有文本，并且 usernameTextField 和 passwordTextField 的字符数超过 6，我希望用户只启动 registerUser()。还有如何解决 passwordTextField 和 retypepasswordTextfield 在注册前有相同的文本？有什么建议吗？

Answer 1

我认为这样更好一些:

@IBAction func registerButtonAction(sender: AnyObject) {
    let validInput = true
    let allTextFields = [fullnameTextField, usernameTextfield, emailTextfield, passwordTextfield, retypepasswordTextfield]
    for textField in allTextFields {
        if textField.text == "" {
            validInput = false
            textField.shake()
        }
    }

    let theTextFieldsWithMin6Characters = [usernameTextfield, passwordTextfield]
    for textField in theTextFieldsWithMin6Characters {
        if textField.text?.characters.count < 6 {
            validInput = false
            textField.shake()
        }
    }
    if passwordTextfield.text != retypepasswordTextfield.text {
        validInput = false
        retypepasswordTextfield.shake()
    }

    if validInput {
        registerButton.setTitle("Registering user...", forState: UIControlState.Normal)
        registerButton.alpha = 0.20
        registerButton.enabled = false
        registerUser()
    }
}