电子邮件验证快速 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，我的警报未显示，只需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!)) {...

表示如果电子邮件有效，将显示无效电子邮件警报。您只需使用

!

if (!isValidEmail(UserEmailTextFiled.text!)) {

反转结果即可

Answer 2

public func isValidEmailAddress() -> Bool {
    let emailRegex = "^[\\w!#$%&'*+/=?`{|}~^-]+(?:\\.[\\w!#$%&'*+/=?`{|}~^-]+)*@(?:[a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,6}$"
    return NSPredicate(format: "SELF MATCHES %@", emailRegex).evaluate(with: self)
}

这是带有正则表达式的 Swift 3.0 Func。 只需复制/粘贴您的帮助程序或扩展文件，然后使用它。

Answer 3

在 Swift 3.0 中

extension  String {

    func nsstring () -> NSString {
        return (self as NSString)
    }

    func isValidEmailAddress () -> Bool
    {

        var returnValue = true
        let emailRegEx = "[A-Z0-9a-z.-_]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,3}"
        do {
            let regex = try NSRegularExpression(pattern: emailRegEx)

            let results = regex.matches(in: self.trimmingCharacters(in: .whitespacesAndNewlines), range: NSRange(location: 0, length: self.characters.count))
            if results.count == 0
            {
                returnValue = false
            }
        }
        catch let error as NSError
        {
            print("invalid regex: \(error.localizedDescription)")
            returnValue = false
        }
        return  returnValue
    }    
}

在视图控制器中

let isValidEmail = yourtextField?.text?.isValidEmailAddress()
if isValidEmail!
{ 
 //Code Here
}
else
{
 //Error Code Here
}

Answer 4

swift 3.0 中的电子邮件验证

@IBOutlet weak var emailid: UILabel!
@IBOutlet weak var MsgAlrtEmailId: UILabel!

@IBAction func Register(_ sender: Any)
    {
        //email

        let providedEmailAddress = emailid.text

        let isEmailAddressValid = isValidEmailAddress(emailAddressString: providedEmailAddress!)

        if isEmailAddressValid
        {
            print("Email address is valid")
            MsgAlrtEmailId.text = "Email Address is valid"
            MsgAlrtEmailId.sizeToFit()
            MsgAlrtEmailId.textColor = UIColor.blue

        } else {
            print("Email address is not valid")
            MsgAlrtEmailId.text = "Email Address Not valid"
            MsgAlrtEmailId.sizeToFit()
           MsgAlrtEmailId.textColor = UIColor.red
        }

  //email rule validation
        func isValidEmailAddress(emailAddressString: String) -> Bool {

            var returnValue = true
            let emailRegEx = "[A-Z0-9a-z.-_]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,3}"

            do {
                let regex = try NSRegularExpression(pattern: emailRegEx)
                let nsString = emailAddressString as NSString
                let results = regex.matches(in: emailAddressString, range: NSRange(location: 0, length: nsString.length))

                if results.count == 0
                {
                    returnValue = false
                }

            } catch let error as NSError {
                print("invalid regex: \(error.localizedDescription)")
                returnValue = false
            }

            return  returnValue
        }

Answer 5

Swift 6.3（原生正则表达式支持）

let email = "[email protected]"
if email ~= /\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}\b/i {
    print("Valid email address.")
} else {
    print("Invalid email address.")
}