ios - 电子邮件验证 swift 2

Question

如何限制用户在文本字段中输入电子邮件地址。问题是，我的警报没有显示，只是注册而不检查电子邮件字段是否有效

if ( username.isEmpty || email.isEmpty || password.isEmpty || phonenumper.isEmpty) {

    let alert = UIAlertController(title: "Sign Up Failed!", message:"Please enter your data for Signup", preferredStyle: .Alert)
    alert.addAction(UIAlertAction(title: "OK ", style: .Default) { _ in })
    self.presentViewController(alert, animated: true){}
}

else {
    if (isValidEmail(UserEmailTextFiled.text!)) {
        let alert = UIAlertController(title: "Inviled Email", message:"Please enter your Email", preferredStyle: .Alert)
        alert.addAction(UIAlertAction(title: "OK ", style: .Default) { _ in })
        self.presentViewController(alert, animated: true){}

    }else{
    //code

    }
func isValidEmail(testStr:String) -> Bool {
        let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"
        let range = testStr.rangeOfString(emailRegEx, options:.RegularExpressionSearch)
        let result = range != nil ? true : false
        return result
    }

Answer 1

根据您发布的代码，if (isValidEmail(UserEmailTextFiled.text!)) {... 意味着如果电子邮件是 invalid 将显示电子邮件警报有效。您只需要使用 ! if (!isValidEmail(UserEmailTextFiled.text!)) {

反转结果