ios - if语句后的预期声明

我在这一行有一个“预期的声明”:

if(userEmail.isEmpty || userPassword.isEmpty || userRepeatPassword.isEmpty)

你能告诉我为什么吗？先感谢您。

我的代码:

类RegisterPageViewController:UIViewController {

@IBOutlet weak var userEmailTextField: UITextField!
@IBOutlet weak var userPasswordTextField: UITextField!
@IBOutlet weak var repeatPasswordTextField: UITextField!

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func registerButtonTapped(_ sender: AnyObject) {

    let userEmail = userEmailTextField.text;
    let userPassword = userPasswordTextField.text;
    let userRepeatPassword  = repeatPasswordTextField.text
}

//检查空白字段

if(userEmail.isEmpty || userPassword.isEmpty || userRepeatPassword.isEmpty)
{

// Display Alert Message
displayMyAlertMessage("All fields are required");
return;

}

最佳答案

在类中甚至全局声明变量，而不是在按钮内部!

var userEmail: String = ""
var userPassword: String = ""
var userRepeatPassword: String = ""

按钮声明:

@IBAction func registerButtonTapped(_ sender: AnyObject) {
    userEmail = userEmailTextField.text;
    userPassword = userPasswordTextField.text;
    userRepeatPassword  = repeatPasswordTextField.text
}